@miniz33 unfortunately, you must have a way to afford a v12 and the proper mainetenance for it, otherwise, just buy something cheap, like a mustang or corvette. now tell me about this sentence "The world used to turn to us for inexpensive reliable power", inexpensive from which point of view? Since those engines are way heavier making less mile per gallon, which translates into higher running costs and therefore taking away the adv of the cast iron reliability(which could compensate this issue)?
@thdmtr I'm not going much further into this, nor do I advocate throwing a v8 in a puff jag as an alternative to the v12. Learn some facts, even a cast iron 350 wouldn't weight much more, It'd be way more reliable too. You do realize jags had american trans for automatics, like a th400 in a different casing, even kwe retrofits have 4l80s. And theres a huge aftermarket range for the v8s, which the v12 doesnt have. If you want to have a performance upgrade, all aluminum ls1. Gets 26mpg.
@tpvalley Auto jags used our th400, and knowles wilkins retrofits use 4l80s, I don't know what yank car you've been in, our older rwd trans works quite well. I'm not even trying to insult British cars either. I was watching jags for a reason, I want one. The jag block and heads are all aluminum, and weigh 680lbs fully dressed for installation. Thats just five pounds less than a big block chevy, and 100lbs more than a small block chev.
@tpvalley Oh indeed jags are incredible cars, I just wish the assembly line quality and care was a little better because it really put a damper on one hell of a recipe. Think 850csi, ferrari 575 maranello, those follow the same formula, and my God were they amazing cars. As for the v12's weight, thats full dressed with the emissions equipment, intake, twin throttlebodie, fuel injection and an OHC layout. As compared to a simple carberator and no emissions equipment. Its not too surprising
jag was like the ferarri built by striking union men with bad workmanship;
it is austin rover with a fancy badge!
throttle bodies and inlet weigh no more than an inlet an holley 4 barrel., ohc- gives one cam worth of extra weight, I dont know about emmissions stuff as we dont have it. and the crank- extra 4 cylinders, maybe, but honestly I would guess the 5.3 alloy v12 to be same weight as iron 5.7 v8.
When we had old jags we maintained them ourself, nothing that different from any engine apart from shit to work on. just oil and filters and plugs and lots of welding....!
we could get 4mpg but generally a 5.3 does about 12-18mpg about the same as a 350+ v8?
roflll the aston martin db7 uses a 3.2 liter supercharged jaguar aj6 engine(the same engine in those 88 jags), and you just threw it away and replaced with a fucking crap chevy red neck engine. hahahahahahahah omg doesnt matter if it has 700 cubic inches with twin turbos, nos, naked girls and blablbla, it will always be a fucking crap cast iron american low end shit.
@thdmtr The xjs is really a gorgeous car, but your british leyland build quality sullied the entire bloodline, an awful electrical systems, bushings, and power that could actually vary from each v12 by 20%. I've known a few people who had them, and they werent very reliable unless tenaciously maintained. As for the (crap cast iron american low end shit)... The world used to turn to us for inexpensive reliable power with those same engines EX: Iso Grifo, Jensen Interceptor, AC Ace,sunbeam tiger.
Care to say what the car ran in the quarter mile?? It's a pet peeve of mine to see 1/4 videos with no ET/trap, or dyno vids with no whp wtq. Thanks, Billt
I have a XJ L with a 350 chevy. I am not a fan of the big block(396-454) swaps in Jags. These days you can easily get 400 hp out of a small block for cheap with smooth idle and good mileage. The combustion chamber design of late Chevy V8's is vastly better than any Jags, that is until they make a V8 themselves. See we are just upgrading to current specs :) The next this I am going to do is replace the POS A/C with Hot Rod Air.
Nice job on adding the big block. For all the haters another car comes to mind, the AC Ace. The Ace was a beautiful british sports car with a whimpy british motor. The yanks got a hold of it, tossed in a 289ci (later a 427ci) and it became one the best cars ever produced, the AC Cobra. The best cars have european handling, and American Muscle.
The ultimate place for a manual V12 XJS gearbox conversion. Over 100 units supplied, and other parts sold visit: Simplyperformance . com based in South UK. 07831 409 935 Thanks
blah blah blah everyone. Its his car he can do what he wants. You all smell like cheese. Enjoy the vid stop stressing to express your opinioins...now look you've made me join in....
Too bad the camera man never showed the clock. What kinda time is this thing turning?I just bought one of these car to small block,can't wait to get started...You WILL see it at the drag strip!
i had a 350 chevy xjs and now i have a v12. i like how smooth the v12 is, but it lacks lower end acceleration without modification. that's ok with me. it is just for cruising. the V12 is just the same to work on as any other engine. there are just extra cylinders etc. Not expensive to maintain if you can read and follow a workshop manual. Parts are cheaper than my wife's toyota if you know where to look.
I see most of you don't know what the fuck you're talking about. The V12 the Jag came with is terribly unreliable. The SB chevy is arguably the greatest engine ever conceived, and by swapping it into the jag you can shave 50-250lbs. And as xylaphonemaster said the engine sits lower and further back further increasing the handling capabilities. Not to mention the better gas mileage.
chevy engines are great engines but if you want a Jag then buy a Jag, but don't desecrate a Jag with a chevy engine, if the extra expense for gas for a V12 bothers you, or the weight of the Jag bothers you , then by all means buy yourself a chevy and forget about owning a classic Jag like the XJS.
Its not the gas consumption, its the notorious unreliability of that particular V12, its a piece of shit. That along with the saving 250lbs and increasing overall handling by lowering the center of gravity and mounting an SB further back towards mid-ship is what makes the swap a substantial upgrade and far superior to the original V12.
saying a V12 is unreliable is what every moron says who swaps a V12 for yankee junk V8 because he can't afford to look after the engine that is original in the Jaguar XJS, I know lots of people who have original engines and they have no problems with them, it is the punkass kids and punkass immature grown ups who need to burn the tires off their cars who put V8's in a Jaguar, it is NOT a Jaguar with a american piece of shit under the hood. It should be crime to be so freakin stupid
Don't get so butt hurt over nothing with your lame insults. Your saying what any fanboy would say, in response to your "moron" statement. Its already been proven FACT that the SB Chevy is considerably more reliable and benefits the overall handling and performance of the XJS chassis by deducting over 250lbs and benefiting center of gravity. No matter what you think people will continue to swap as it is their car so they have the right to. If you dont like it go blow your brains out.
Hey pinhead, go ahead and put an american piece of junk under the hood of an XJS and it will be worth @#$^%$%^ when you decide to sell it. If you can't afford to buy gas for it or are too #^^&R%$#$ stupid to learn to work on a V12 then lower your intelligence and work on a V8 asshole, I guess with a V8 you only have to flip burgers for a living to buy your gas..huh??
I work for Ford and I have an associates degree in automotive technology.
I drive a C280 Benz and im not a fan of domestics..,
Great job on making a complete ass of yourself. Youve made it apparent that youre a fanboy & with that being said its evident that you cannot accept anothers opinions without having to respond ignorantly with insults and 5th grade grammar.
Theres many swapped Jags, & the SB350 was a stellar motor in its era..,
lmao jags are well known for unreliability and compare a jag v12 to a chevy big block you are going to make more power out of the big block and is much easier to work on, and do you forget that ford owned jaguar for almost 20 years? or the fact that there were european cars scrambling to put big american v8's in there cars for performance ala jensen interceptor
I guess it depends on how the V12 was treated, I have an '88 Jag XJS and I love it, I love the way it handles and I don't care about the weight or gas consumption. Do you still have your Jag? Did you do a full restoration? And if you wanted to sell it you could not sell to a "purist". Chevy made some great engines but their transmissions were crap, we had a GMC and it went thru a tranny every two years and the mechanic said that particular tranny was his bread and butter. Donna
Because the jag engines are expensive and alittle dificult to work on. You can get all the same get up and go and be just as quiet as a regular jag with a 350. And if it breaks down you can stop at any parts store and get parts for it.
@jetlag700 Would you or would you not agree that parts for that car in america are expensive. Yet any joe auto shop has the parts for american v8s. I never said the v12 was a piece of shit but i did say they are expensive when things go bad.
Ruin an XJS?? The big block is the best thing you could have done to that car! Its an otherwise worthless vehicle, slow, ill handling, uncomfortable, the list goes on.....
@jetlag700 I've been a LandRover/Jaguar tech for 20 years. I know a little about the v12! Try putting 100k on a V12 without spending a small fortune to keep it going, can't be done! Yes with enough money even a Yugo can be made to be a decent car but at the end of the day the XJS and the V12 were overpriced,underpowered British ATTEMPTS to build a sports car. EPIC FAIL!!
See how little you know? The XJS IS NOT A SPORTSCAR....It is a Grand Tourer-big difference. In twenty years the XJS with the original V12 will be worth something, the XJS with the shit "chevy" engine will be worthless.
Ruin? British Leyland ruined the XJS with their shoddy worksmanship. I've come across 80's examples rustier than unrestored 50's and 60's Jags.
The Jag straight 6 XK motor and V12 are both fantastic engines, but the Chevy V8 offers more torque, is much cheaper to get parts for, and doesn't suffer from overheating as some Jags are known to. Besides, British sportscar/American engine's an ancient formula dating back to the AC Cobra... and it works. Works really well.
Hey buddy I agree with you, these assholes who put chevy's in a Jag are incredibly stupid, it is most likely that they are too freakin stupid when it comes to a V12 or too POOR to buy gas for it or maintain it.
The "anti" posters here are missing the point, why mess with an engine that is complex and expensive to tune, when there's plenty of simple and easy to tune V8's about?
Over here in the UK they are popular with banger racers - The serious competitors don't mess with the V12 either.
Don't get me wrong, the XJS is a fine car, but if you've got a less-than mint example then you could do a lot worse than this with it!!
@robgee1964 The reason banger racers dont use the V12`s is becuse your not allowed to use fuel injected cars on the track, so they tend to stick carbed Ford Essex V6`s in everything.
sick xjs, my dad had one, and i was in the process of buying it and it caught on fire. so ow i don't have it. My dad also had 2 xke's (62 flat floor coupe, 67 1 and a half convert. ) they ran great. im glad you put an 8 in it, its not heresy. i grew up w/ them and now i own a 93 firebird formula. those v12's burn up. i'll take 8 any day.
Try a V12 running well with a manual gearbox instead of the power-sapping GM unit. Then add 100bhp and you may think swapping to a v8 is a waste of time.
that car was not Jag's best effort.. this guy was hardly defacing a XJ6 or a car of historical importance. The Jags of that era were panned by automotive enthusiast then and still are now.
fuck it- drop a big block in the bitch and flog it i say. good on ya!!
Mixing and matching engines like this is something of a sin. ALL cars and engines have pros and cons. Above all, the film clip above represents nothing other than the skill-less abuse of a fine machine by the wilfully ignorant.
I agree with you there, these punkasses know nothing of the V12 engine, I have one, it does not overhead because I look after the coolant system, the engine does not burn oil, it does not leak oil, it does not leak tranny fluid, it does not smoke, it is not gutless as these assholes have suggested, and it is a real dream machine the way it is. I am a woman and I work on my own car so who the hell are these assholes trying to fool?
I have a 78 XJ12L with a chevy 350 in it and it runs better all around bring on your V12 and I will wear it out. The V12 was a pig and a all iron small block weighs about 300 lbs less and the big chevy is about a wash. And the CG is further back. All hail lumps!
Runs better all round? Bollocks, the Jag V12 is one of the smoothest engines ever built. The V8 was not designed to be in that car. Just imagine if somebody put a Skoda engine in a vintage Bugatti just because it was a bit more powerfull or reliable. The fact is that nobody is stupid enough to do something like that, except people who put shit american V8s in Jags.
The original/lump question has been batted around for years, so no point in rehashing Reckon us hicks over here in the new world are used to engines that go when we want to, last 100k miles, give good power and mpg and have reasonable repair costs. Better to keep a nice bit of coachwork out of the junk yard, thats where most older ones go when the engines break. How often do you hear of Chevy V8's dropping valves and breaking cranks and rods in a stock setup, rarely. Very common with Jags.
Its not common with Jags at all you are just talking rubbish. The V12 engine is a reliable motor if looked after. For a V12 100k miles is nothing, and 200k is only just run in. But there sometimes is the problem of faulty electrics but that is only because they either get effected by water or the engine heat has made them suffer. You could quite easily just upgrade the electrics which is a lot better then replacing the engine with smaller one that was built in the stone age.
don't drive them like an asshole then lol and they will treat you right, keep the oil changed, the coolant changed and don't spin the f*&%*() wheels off them doing burnouts like some 15 year old punk trying to impress his buddies.
@mweverett That'a because some jackass overheated the engine, likely because he left it running in the driveway for an hour and "forgot" to turn it off.~!~!
Jag V12 one of the smoothest engines ever built.... Right. That may be the stupidest thing I've ever heard and it is quite obvious that you've never wrenched on a car. The V12 is perhaps the best boat anchor ever invented. Getting a whole 7mpg with NO POWER at all. FYI by installing a smallblock in any of these old jags setup with the V12, you lose 2-300 pounds. I am not knocking jags as I love them, you just need to drop a V8 in one so that you can drive it daily.
I work on Jaguars, my Dad ownes a Jaguar garage, I have worked on and been in many Jaguars and know a lot about them. The Jaguar V12 actually produces 300bhp and returns 22mpg, which is probably more than the poxy unbalanced lumpy V8. So how dare you make any kind of assumpsion like that. I have seen V8 converted Jaguars and they are crap, sure a tuned V8 is a bit faster than the V12 but what is stopping you from tuning the V12?
And for your information the Jaguar V12 is one of the smoothest engines in the world. You can sit in a XJ12 with the engine on and you wouldn't be able to tell its running.
It is quiet, I'll definitely give you that. It's even quieter when your stuck on the side of the road because you tried to drive your V12 Jag every day. Like I said earlier, I'm not knocking on Jags as they are beautiful vehicles. Mechanically, they aren't practical to drive everyday. If you have a vintage XKE and you drive it twice a year, then the original powertrain is suitable.
We used to have a V12 Series 3 XJ which was driven every day, when we sold it, it had 150k miles on the clock. A few months ago it came back into the garage for a service, it had done just under 300k miles and was still running perfectly. The V12 engines are very reliable if taken care of.
I have an "88 XJS and I drive it everyday and I drive it in the winter up here in Canada, and I don't get stuck, the sheer weight alone gets me around in snow. The engines love cold weather.
@ret1red4life mechanically the ARE practical to drive everyday, it when idiots let them sit more months and years on end that they don't run right. Run a V12 everyday is one of the best things you can do for it.
Also, here in the U.S., these old jags are a dime a dozen. Unless it is a low mileage original vehicle, they are worthless. That is why they make great project vehicles to drop a reliable, cheap American pushrod into.
Yea! Thanks for sticking up for us. I drive an 84 XJS. Over the years...lots of problems but I don't care. Right now the damn ignition module is shutting her down at temp. So, my mechanic is trying to solve. Any ideas welcome. Thanks.
If I remember correctly the ignition module is situated where it is too hot, there is an upgrade with longer wires that moves the module away from the heat of the engine. ReOpus makes the upgrade, I was looking at it but my car is tos new for it being an '88 model.
If a Jag had a mind of it's own it would literally VOMIT the chevy engine out on the sidewalk less than a mile into the first ride, THEN it would catch itself on fire out of SHEER embarassment~!~!~!
nice to see some one with some brains that actualy knows what there talking about. i just got done upgrading the engine managment system in my V12 XJS and doing a bit of tunning as well. she now returns 22MPG and we estimate to be producing about 425HP. And not to toaly dis RET1RED4LIFE yes these cars are hard to work on but id rather put in the extra effort and have some thing that original, instead of having a jaguar with a dime a dozen V8
right on, I have two jags, one with a V12 and it runs great, and I am upgrading the engine management system and putting in a 5 speed manual transmission, and getting custonm aluminum wheels made. And every time with out fail when I go out I am usually not more than a few blocks from my house and already getting compliments and get several a day.
@ret1red4life hey pinhead I drive my Jag V12 everyday and it has not let me down. Of course I CAN afford the gas and maintenance and the extra 300 pounds in an extra 300 pounds of life insurance when some asshole in V8 powered bucket of bolts hits ya.
you are right buddy, one would have to be a stunned shithead to put a chevy piece of crap in a Jaguar. The V12 is what makes the XJS and XJ12 such a beautiful machine besides the beauty of the car itself.
Hey, guess what? I am female and do some of the work on my own XJS so those punkassess who desicrate the Jaguar with a V8 should either get educated on the V12 or go back to driving Chevettes. Sounds like they are either too stupid to work on a V12 or don't have the money to rebuild a V12. I would spend $18,000 to rebuild a V12 before I would EVER put a piece of shit chevy engine in either of my Jaguars.
The V12 is a far better engine, so what it had a few electrical problems, that doesnt stop you from upgrading the electrics. Putting an American V8 engine unbalances the car, makes it unoriginal and spoils it.
That's not true, a Chevy V8 sits lower and further back than the V12 which means the center of gravity's lower and closer to the middle of the vehicle.
the car was not designed for a lower center of gravity by using a V8 chevy engine, the XJS already only stand 3 feet 11 inches on some models and if you can't drive this one without "rolling" the damn thing then it is time to go back to riding a tri-cycle. pal.
@manoman0 Mate I know what I am talking about, as far as engineering goes, the V12 is far superior to the pile of wank V8 and much more efficient. I have worked on V12 Jags, they only go wrong if you don't look after them.
@idonlikeveg ...after being well re-engineered....that is? Well, I wouldn't call them crap but an bowtie-V8 is the most successful engine in the world....
@manoman0 Pretty much all Aston did was fit a dohc and fitted stronger crank and pistons and balanced them - the basic block still remains. the body shell wasn't re engineered though, just suspension really.
Don't forget the Jaguar V12 was developed for Smoothness, not power.
damn that cat looks sweet!
mannybz 6 months ago
@miniz33 maintenance****
thdmtr 7 months ago
@miniz33 unfortunately, you must have a way to afford a v12 and the proper mainetenance for it, otherwise, just buy something cheap, like a mustang or corvette. now tell me about this sentence "The world used to turn to us for inexpensive reliable power", inexpensive from which point of view? Since those engines are way heavier making less mile per gallon, which translates into higher running costs and therefore taking away the adv of the cast iron reliability(which could compensate this issue)?
thdmtr 7 months ago
@thdmtr I'm not going much further into this, nor do I advocate throwing a v8 in a puff jag as an alternative to the v12. Learn some facts, even a cast iron 350 wouldn't weight much more, It'd be way more reliable too. You do realize jags had american trans for automatics, like a th400 in a different casing, even kwe retrofits have 4l80s. And theres a huge aftermarket range for the v8s, which the v12 doesnt have. If you want to have a performance upgrade, all aluminum ls1. Gets 26mpg.
miniz33 7 months ago
@miniz33
is the jag engine iron or alloy block iron heads?
dont jags like this use zf gearboxes?
I know that u cannot notice the shifts unlike every yank car Ive been in, which isnt many.
a nice big diesel engine methinks!
tpvalley 7 months ago
@tpvalley Auto jags used our th400, and knowles wilkins retrofits use 4l80s, I don't know what yank car you've been in, our older rwd trans works quite well. I'm not even trying to insult British cars either. I was watching jags for a reason, I want one. The jag block and heads are all aluminum, and weigh 680lbs fully dressed for installation. Thats just five pounds less than a big block chevy, and 100lbs more than a small block chev.
miniz33 7 months ago
@miniz33
I know american transmissions work well, I said nothing to the contrary,
I just said that jags are silky smooth.
I cant see how a alloy 5.3 v12 can weigh as much as a cast iron 7-8litre v8.
tpvalley 7 months ago
@tpvalley Oh indeed jags are incredible cars, I just wish the assembly line quality and care was a little better because it really put a damper on one hell of a recipe. Think 850csi, ferrari 575 maranello, those follow the same formula, and my God were they amazing cars. As for the v12's weight, thats full dressed with the emissions equipment, intake, twin throttlebodie, fuel injection and an OHC layout. As compared to a simple carberator and no emissions equipment. Its not too surprising
miniz33 7 months ago
@miniz33
jag was like the ferarri built by striking union men with bad workmanship;
it is austin rover with a fancy badge!
throttle bodies and inlet weigh no more than an inlet an holley 4 barrel., ohc- gives one cam worth of extra weight, I dont know about emmissions stuff as we dont have it. and the crank- extra 4 cylinders, maybe, but honestly I would guess the 5.3 alloy v12 to be same weight as iron 5.7 v8.
tpvalley 7 months ago
@thdmtr
When we had old jags we maintained them ourself, nothing that different from any engine apart from shit to work on. just oil and filters and plugs and lots of welding....!
we could get 4mpg but generally a 5.3 does about 12-18mpg about the same as a 350+ v8?
tpvalley 7 months ago
roflll the aston martin db7 uses a 3.2 liter supercharged jaguar aj6 engine(the same engine in those 88 jags), and you just threw it away and replaced with a fucking crap chevy red neck engine. hahahahahahahah omg doesnt matter if it has 700 cubic inches with twin turbos, nos, naked girls and blablbla, it will always be a fucking crap cast iron american low end shit.
thdmtr 7 months ago
@thdmtr The xjs is really a gorgeous car, but your british leyland build quality sullied the entire bloodline, an awful electrical systems, bushings, and power that could actually vary from each v12 by 20%. I've known a few people who had them, and they werent very reliable unless tenaciously maintained. As for the (crap cast iron american low end shit)... The world used to turn to us for inexpensive reliable power with those same engines EX: Iso Grifo, Jensen Interceptor, AC Ace,sunbeam tiger.
miniz33 7 months ago
Care to say what the car ran in the quarter mile?? It's a pet peeve of mine to see 1/4 videos with no ET/trap, or dyno vids with no whp wtq. Thanks, Billt
jgizzy 11 months ago
I have a XJ L with a 350 chevy. I am not a fan of the big block(396-454) swaps in Jags. These days you can easily get 400 hp out of a small block for cheap with smooth idle and good mileage. The combustion chamber design of late Chevy V8's is vastly better than any Jags, that is until they make a V8 themselves. See we are just upgrading to current specs :) The next this I am going to do is replace the POS A/C with Hot Rod Air.
mweverett 11 months ago
Nice job on adding the big block. For all the haters another car comes to mind, the AC Ace. The Ace was a beautiful british sports car with a whimpy british motor. The yanks got a hold of it, tossed in a 289ci (later a 427ci) and it became one the best cars ever produced, the AC Cobra. The best cars have european handling, and American Muscle.
monaro085 1 year ago
Put the same Jag with its v12 and see which one wins!
Onry1 1 year ago
@Onry1 V8 would win lol theres no doubt really.
idonlikeveg 1 year ago
@idonlikeveg doubtful....
Onry1 1 year ago
@Onry1 Well, the stock V12 XJ-S will do a 1/4 mile in 15 seconds (UK spec)
but the V8 in the car above has nos in it and looks like its running 13/14 seconds.
You could be right.
idonlikeveg 1 year ago
This has been flagged as spam show
The ultimate place for a manual V12 XJS gearbox conversion. Over 100 units supplied, and other parts sold visit: Simplyperformance . com based in South UK. 07831 409 935 Thanks
joshthespaco 1 year ago
blah blah blah everyone. Its his car he can do what he wants. You all smell like cheese. Enjoy the vid stop stressing to express your opinioins...now look you've made me join in....
madv8man 1 year ago 2
this is "the better jaguar". just stating a fact.
manoman0 1 year ago
well i have a 1983 v12 xjs 60,000 miles,love the v12 did nt like the auto,so i fitted a 5 speed manual and a 3.54 diff,good times
xjs1983 1 year ago
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Use 1% API TC two stroke oil in your fuel to prevent fuel system and engine and carb corrosion using the modern ultra dry eco fuel!
Schlipperschlopper 1 year ago
An unmolested Yugo would be worth something in twenty years too, still doesn't make it a nice car.....
rjacks3 1 year ago
Lots of butthurt tea-sippers in here. Nice car btw.
SouthshoreVice 2 years ago
best sounding engines r v12's
REVs99 2 years ago
two of my favorite things. An 88 XJS with American v8 power!
dude486 2 years ago
yankee bullshit~ buy yourself a chevy chevette and be done with it.
jetlag700 2 years ago
Your an asshole dude.....I mean seriously? What is that even supposed to mean anyway?
dude486 2 years ago
Too bad the camera man never showed the clock. What kinda time is this thing turning?I just bought one of these car to small block,can't wait to get started...You WILL see it at the drag strip!
kilowatt047 2 years ago
i had a 350 chevy xjs and now i have a v12. i like how smooth the v12 is, but it lacks lower end acceleration without modification. that's ok with me. it is just for cruising. the V12 is just the same to work on as any other engine. there are just extra cylinders etc. Not expensive to maintain if you can read and follow a workshop manual. Parts are cheaper than my wife's toyota if you know where to look.
BIGINSF 2 years ago
I see most of you don't know what the fuck you're talking about. The V12 the Jag came with is terribly unreliable. The SB chevy is arguably the greatest engine ever conceived, and by swapping it into the jag you can shave 50-250lbs. And as xylaphonemaster said the engine sits lower and further back further increasing the handling capabilities. Not to mention the better gas mileage.
Soprano313 2 years ago
chevy engines are great engines but if you want a Jag then buy a Jag, but don't desecrate a Jag with a chevy engine, if the extra expense for gas for a V12 bothers you, or the weight of the Jag bothers you , then by all means buy yourself a chevy and forget about owning a classic Jag like the XJS.
jetlag700 2 years ago
Its not the gas consumption, its the notorious unreliability of that particular V12, its a piece of shit. That along with the saving 250lbs and increasing overall handling by lowering the center of gravity and mounting an SB further back towards mid-ship is what makes the swap a substantial upgrade and far superior to the original V12.
Soprano313 2 years ago
saying a V12 is unreliable is what every moron says who swaps a V12 for yankee junk V8 because he can't afford to look after the engine that is original in the Jaguar XJS, I know lots of people who have original engines and they have no problems with them, it is the punkass kids and punkass immature grown ups who need to burn the tires off their cars who put V8's in a Jaguar, it is NOT a Jaguar with a american piece of shit under the hood. It should be crime to be so freakin stupid
jetlag700 2 years ago 2
Don't get so butt hurt over nothing with your lame insults. Your saying what any fanboy would say, in response to your "moron" statement. Its already been proven FACT that the SB Chevy is considerably more reliable and benefits the overall handling and performance of the XJS chassis by deducting over 250lbs and benefiting center of gravity. No matter what you think people will continue to swap as it is their car so they have the right to. If you dont like it go blow your brains out.
Cheers!
Soprano313 2 years ago
@Soprano313
Hey pinhead, go ahead and put an american piece of junk under the hood of an XJS and it will be worth @#$^%$%^ when you decide to sell it. If you can't afford to buy gas for it or are too #^^&R%$#$ stupid to learn to work on a V12 then lower your intelligence and work on a V8 asshole, I guess with a V8 you only have to flip burgers for a living to buy your gas..huh??
jetlag700 1 year ago
@jetlag700
No I dont flip burgers,
I work for Ford and I have an associates degree in automotive technology.
I drive a C280 Benz and im not a fan of domestics..,
Great job on making a complete ass of yourself. Youve made it apparent that youre a fanboy & with that being said its evident that you cannot accept anothers opinions without having to respond ignorantly with insults and 5th grade grammar.
Theres many swapped Jags, & the SB350 was a stellar motor in its era..,
Go cry about it...
Soprano313 1 year ago
lmao jags are well known for unreliability and compare a jag v12 to a chevy big block you are going to make more power out of the big block and is much easier to work on, and do you forget that ford owned jaguar for almost 20 years? or the fact that there were european cars scrambling to put big american v8's in there cars for performance ala jensen interceptor
oohmammaoohmamma 1 year ago
I guess it depends on how the V12 was treated, I have an '88 Jag XJS and I love it, I love the way it handles and I don't care about the weight or gas consumption. Do you still have your Jag? Did you do a full restoration? And if you wanted to sell it you could not sell to a "purist". Chevy made some great engines but their transmissions were crap, we had a GMC and it went thru a tranny every two years and the mechanic said that particular tranny was his bread and butter. Donna
jetlag700 2 years ago
Thats badass!
Soprano313 2 years ago
i like the v12' they had, you could fcuk around with them to get there horsepower up, its a shame jag got rid of them
Jasshands1 2 years ago
If you wanted a chevy why not just buy a chevy? Why ruin an xjs? dumb*ss
videos136 2 years ago
Because the jag engines are expensive and alittle dificult to work on. You can get all the same get up and go and be just as quiet as a regular jag with a 350. And if it breaks down you can stop at any parts store and get parts for it.
drfelgood5 2 years ago
@drfelgood5
See what I mean? At least Tthis guy has the balls to admit he is too ^$&##$^ POOR to own a Jag with a V12~!~!
jetlag700 1 year ago
@jetlag700 Would you or would you not agree that parts for that car in america are expensive. Yet any joe auto shop has the parts for american v8s. I never said the v12 was a piece of shit but i did say they are expensive when things go bad.
drfelgood5 1 year ago
Ruin an XJS?? The big block is the best thing you could have done to that car! Its an otherwise worthless vehicle, slow, ill handling, uncomfortable, the list goes on.....
rjacks3 2 years ago
@rjacks3 It should be against the law to be so freakin stupid, you're the guy who should own a Chevette cuz you know shit about the V12.
jetlag700 1 year ago
@jetlag700 I've been a LandRover/Jaguar tech for 20 years. I know a little about the v12! Try putting 100k on a V12 without spending a small fortune to keep it going, can't be done! Yes with enough money even a Yugo can be made to be a decent car but at the end of the day the XJS and the V12 were overpriced,underpowered British ATTEMPTS to build a sports car. EPIC FAIL!!
rjacks3 1 year ago
@rjacks3
See how little you know? The XJS IS NOT A SPORTSCAR....It is a Grand Tourer-big difference. In twenty years the XJS with the original V12 will be worth something, the XJS with the shit "chevy" engine will be worthless.
jetlag700 1 year ago
Ruin? British Leyland ruined the XJS with their shoddy worksmanship. I've come across 80's examples rustier than unrestored 50's and 60's Jags.
The Jag straight 6 XK motor and V12 are both fantastic engines, but the Chevy V8 offers more torque, is much cheaper to get parts for, and doesn't suffer from overheating as some Jags are known to. Besides, British sportscar/American engine's an ancient formula dating back to the AC Cobra... and it works. Works really well.
xylaphonemaster 2 years ago
@videos136
Hey buddy I agree with you, these assholes who put chevy's in a Jag are incredibly stupid, it is most likely that they are too freakin stupid when it comes to a V12 or too POOR to buy gas for it or maintain it.
jetlag700 1 year ago
thats fucking awesome
killakojak 2 years ago
My friends dad has an XJS with a 468 CBB in it. It's mean as hell.
NiteflySA 2 years ago
Here in NZ older XJ6s with GM 350 V8s are not uncommon. Jag styling with reliability and performance. Also the owners tend to know their 350s.
EnigmaNZ1 3 years ago 4
Nice job with the V8!
The "anti" posters here are missing the point, why mess with an engine that is complex and expensive to tune, when there's plenty of simple and easy to tune V8's about?
Over here in the UK they are popular with banger racers - The serious competitors don't mess with the V12 either.
Don't get me wrong, the XJS is a fine car, but if you've got a less-than mint example then you could do a lot worse than this with it!!
robgee1964 3 years ago 8
@robgee1964 The reason banger racers dont use the V12`s is becuse your not allowed to use fuel injected cars on the track, so they tend to stick carbed Ford Essex V6`s in everything.
For the yanks, banger racing = demolition derby
LondonItalian 1 year ago
sick xjs, my dad had one, and i was in the process of buying it and it caught on fire. so ow i don't have it. My dad also had 2 xke's (62 flat floor coupe, 67 1 and a half convert. ) they ran great. im glad you put an 8 in it, its not heresy. i grew up w/ them and now i own a 93 firebird formula. those v12's burn up. i'll take 8 any day.
xxxteenobesexxx 3 years ago
Nice Jag, man, the v8 sounds great. You may need to work on your burnouts a tad. What times you running on this thing?
chevelledrew 3 years ago
Very nice! check out the clip of my jag...nice to see more chevy powered jags!
tommynos30 3 years ago
@tommynos30 buy a sack-o-shit chevette asshole and leave the Jags for real car owners.
jetlag700 1 year ago
Comment removed
tommynos30 1 year ago
Try a V12 running well with a manual gearbox instead of the power-sapping GM unit. Then add 100bhp and you may think swapping to a v8 is a waste of time.
slimshady1967 3 years ago 3
that was sweet! My Dads XJS sounds almost like that.
The V12 XJS is so nice and smooth. and hell good handling.
getabmxbitch 4 years ago
that car was not Jag's best effort.. this guy was hardly defacing a XJ6 or a car of historical importance. The Jags of that era were panned by automotive enthusiast then and still are now.
fuck it- drop a big block in the bitch and flog it i say. good on ya!!
shanonobanion 4 years ago 2
Mixing and matching engines like this is something of a sin. ALL cars and engines have pros and cons. Above all, the film clip above represents nothing other than the skill-less abuse of a fine machine by the wilfully ignorant.
BarringtonSavoy 4 years ago
This comment has received too many negative votes show
jags are unreliable pieces of shit
67675656565655656565 3 years ago
You oviously dont know your facts on Jaguar then if you say that, and you just cant afford a nice one so you try to find a way to rip on them.
BeachhBoyy 2 years ago 7
Comment removed
jetlag700 2 years ago
@BarringtonSavoy
I agree with you there, these punkasses know nothing of the V12 engine, I have one, it does not overhead because I look after the coolant system, the engine does not burn oil, it does not leak oil, it does not leak tranny fluid, it does not smoke, it is not gutless as these assholes have suggested, and it is a real dream machine the way it is. I am a woman and I work on my own car so who the hell are these assholes trying to fool?
jetlag700 1 year ago
I have a 78 XJ12L with a chevy 350 in it and it runs better all around bring on your V12 and I will wear it out. The V12 was a pig and a all iron small block weighs about 300 lbs less and the big chevy is about a wash. And the CG is further back. All hail lumps!
mweverett 4 years ago
Runs better all round? Bollocks, the Jag V12 is one of the smoothest engines ever built. The V8 was not designed to be in that car. Just imagine if somebody put a Skoda engine in a vintage Bugatti just because it was a bit more powerfull or reliable. The fact is that nobody is stupid enough to do something like that, except people who put shit american V8s in Jags.
samandlauz 4 years ago
The original/lump question has been batted around for years, so no point in rehashing Reckon us hicks over here in the new world are used to engines that go when we want to, last 100k miles, give good power and mpg and have reasonable repair costs. Better to keep a nice bit of coachwork out of the junk yard, thats where most older ones go when the engines break. How often do you hear of Chevy V8's dropping valves and breaking cranks and rods in a stock setup, rarely. Very common with Jags.
mweverett 4 years ago 2
Its not common with Jags at all you are just talking rubbish. The V12 engine is a reliable motor if looked after. For a V12 100k miles is nothing, and 200k is only just run in. But there sometimes is the problem of faulty electrics but that is only because they either get effected by water or the engine heat has made them suffer. You could quite easily just upgrade the electrics which is a lot better then replacing the engine with smaller one that was built in the stone age.
samandlauz 4 years ago
don't drive them like an asshole then lol and they will treat you right, keep the oil changed, the coolant changed and don't spin the f*&%*() wheels off them doing burnouts like some 15 year old punk trying to impress his buddies.
jetlag700 2 years ago
@mweverett That'a because some jackass overheated the engine, likely because he left it running in the driveway for an hour and "forgot" to turn it off.~!~!
jetlag700 1 year ago
Jag V12 one of the smoothest engines ever built.... Right. That may be the stupidest thing I've ever heard and it is quite obvious that you've never wrenched on a car. The V12 is perhaps the best boat anchor ever invented. Getting a whole 7mpg with NO POWER at all. FYI by installing a smallblock in any of these old jags setup with the V12, you lose 2-300 pounds. I am not knocking jags as I love them, you just need to drop a V8 in one so that you can drive it daily.
ret1red4life 4 years ago 2
I work on Jaguars, my Dad ownes a Jaguar garage, I have worked on and been in many Jaguars and know a lot about them. The Jaguar V12 actually produces 300bhp and returns 22mpg, which is probably more than the poxy unbalanced lumpy V8. So how dare you make any kind of assumpsion like that. I have seen V8 converted Jaguars and they are crap, sure a tuned V8 is a bit faster than the V12 but what is stopping you from tuning the V12?
samandlauz 4 years ago
And for your information the Jaguar V12 is one of the smoothest engines in the world. You can sit in a XJ12 with the engine on and you wouldn't be able to tell its running.
samandlauz 4 years ago
It is quiet, I'll definitely give you that. It's even quieter when your stuck on the side of the road because you tried to drive your V12 Jag every day. Like I said earlier, I'm not knocking on Jags as they are beautiful vehicles. Mechanically, they aren't practical to drive everyday. If you have a vintage XKE and you drive it twice a year, then the original powertrain is suitable.
ret1red4life 4 years ago
We used to have a V12 Series 3 XJ which was driven every day, when we sold it, it had 150k miles on the clock. A few months ago it came back into the garage for a service, it had done just under 300k miles and was still running perfectly. The V12 engines are very reliable if taken care of.
samandlauz 4 years ago
@samandlauz
Exactly~!~!
Chevy engines are for chevy's. V12's are for one of the world's most beautiful car.
Only pimps and paupers put cheap V8's in Jags.
jetlag700 1 year ago
I have an "88 XJS and I drive it everyday and I drive it in the winter up here in Canada, and I don't get stuck, the sheer weight alone gets me around in snow. The engines love cold weather.
jetlag700 2 years ago
@ret1red4life mechanically the ARE practical to drive everyday, it when idiots let them sit more months and years on end that they don't run right. Run a V12 everyday is one of the best things you can do for it.
jetlag700 1 year ago
Also, here in the U.S., these old jags are a dime a dozen. Unless it is a low mileage original vehicle, they are worthless. That is why they make great project vehicles to drop a reliable, cheap American pushrod into.
ret1red4life 4 years ago
there is only one place to "shove" a chevy engine, and it does not belong in the bonnet of a Jag, even a rust bucket Jag.
jetlag700 2 years ago
@ret1red4life
You got that right "cheap" V8....for paupers and pimps.
jetlag700 1 year ago
Yea! Thanks for sticking up for us. I drive an 84 XJS. Over the years...lots of problems but I don't care. Right now the damn ignition module is shutting her down at temp. So, my mechanic is trying to solve. Any ideas welcome. Thanks.
librastars 4 years ago
I wanted to drop a 5.0HO ford into a mercedes 300E, with a T5 manual trans. Giggidy!
capridrifter 3 years ago
@librastars
If I remember correctly the ignition module is situated where it is too hot, there is an upgrade with longer wires that moves the module away from the heat of the engine. ReOpus makes the upgrade, I was looking at it but my car is tos new for it being an '88 model.
If a Jag had a mind of it's own it would literally VOMIT the chevy engine out on the sidewalk less than a mile into the first ride, THEN it would catch itself on fire out of SHEER embarassment~!~!~!
jetlag700 1 year ago
nice to see some one with some brains that actualy knows what there talking about. i just got done upgrading the engine managment system in my V12 XJS and doing a bit of tunning as well. she now returns 22MPG and we estimate to be producing about 425HP. And not to toaly dis RET1RED4LIFE yes these cars are hard to work on but id rather put in the extra effort and have some thing that original, instead of having a jaguar with a dime a dozen V8
sparkplug1018 3 years ago
@sparkplug1018
right on, I have two jags, one with a V12 and it runs great, and I am upgrading the engine management system and putting in a 5 speed manual transmission, and getting custonm aluminum wheels made. And every time with out fail when I go out I am usually not more than a few blocks from my house and already getting compliments and get several a day.
jetlag700 1 year ago
@ret1red4life hey pinhead I drive my Jag V12 everyday and it has not let me down. Of course I CAN afford the gas and maintenance and the extra 300 pounds in an extra 300 pounds of life insurance when some asshole in V8 powered bucket of bolts hits ya.
jetlag700 1 year ago
you are right buddy, one would have to be a stunned shithead to put a chevy piece of crap in a Jaguar. The V12 is what makes the XJS and XJ12 such a beautiful machine besides the beauty of the car itself.
jetlag700 2 years ago 2
@jetlag700
Hey, guess what? I am female and do some of the work on my own XJS so those punkassess who desicrate the Jaguar with a V8 should either get educated on the V12 or go back to driving Chevettes. Sounds like they are either too stupid to work on a V12 or don't have the money to rebuild a V12. I would spend $18,000 to rebuild a V12 before I would EVER put a piece of shit chevy engine in either of my Jaguars.
jetlag700 1 year ago
The V12 is a far better engine, so what it had a few electrical problems, that doesnt stop you from upgrading the electrics. Putting an American V8 engine unbalances the car, makes it unoriginal and spoils it.
samandlauz 4 years ago
That's not true, a Chevy V8 sits lower and further back than the V12 which means the center of gravity's lower and closer to the middle of the vehicle.
xylaphonemaster 2 years ago
hey pal, I love the weight of the v12 engine and the center of gravity is just right.
the heavy front end is what makes the car such a dream machine to drive.
jetlag700 2 years ago
the car was not designed for a lower center of gravity by using a V8 chevy engine, the XJS already only stand 3 feet 11 inches on some models and if you can't drive this one without "rolling" the damn thing then it is time to go back to riding a tri-cycle. pal.
jetlag700 2 years ago 2
You have spoiled a nice car. Be ashamed.
samandlauz 4 years ago
better than the bone yard after a V12 meltdown
billt928 4 years ago 14
@samandlauz - no. it's an upgrade from their stock crap engines. get the facts, buddy.
manoman0 1 year ago
@manoman0 Mate I know what I am talking about, as far as engineering goes, the V12 is far superior to the pile of wank V8 and much more efficient. I have worked on V12 Jags, they only go wrong if you don't look after them.
I think it is you who should get the facts right.
samandlauz 1 year ago
@manoman0 Crap engines? well it's a good enough block for Aston Martin to stick in their cars.
oh yeah, and the basic XJ-S monocoque shell was used for the DB7.
idonlikeveg 1 year ago
@idonlikeveg ...after being well re-engineered....that is? Well, I wouldn't call them crap but an bowtie-V8 is the most successful engine in the world....
manoman0 1 year ago
@manoman0 Pretty much all Aston did was fit a dohc and fitted stronger crank and pistons and balanced them - the basic block still remains. the body shell wasn't re engineered though, just suspension really.
Don't forget the Jaguar V12 was developed for Smoothness, not power.
idonlikeveg 1 year ago
@idonlikeveg well. I never said I would say NO to a Jag....just to get this issue right here....lol
manoman0 1 year ago
@manoman0 I wouldn't either xD That's why I have one in my garage needing paint and an interior! haha.
idonlikeveg 1 year ago
god i love those cars, what have you all done to it
cougarfan1341 4 years ago
What numbers did it run??
rossabo 4 years ago
yes it is
billt928 4 years ago
is that Moroso?
a1awind 4 years ago