Nissan SR20-DET Block Resurfacing

[journeyquest1]

More aluminum block garbage. Best engine i had was a Nissan NAPS-Z 2.4. Cast iron block/ alum head. Engine went 350,000 mi without pulling the head, or replacing timing chain (although it was starting to rattle.) Valves went but block was still good. My Honda has 90k and cat clogged, cooking my engine. Give me cast iron block even if it is 40lbs heavier.

[eddohan]

I noticed when resurfacing, the cutter/grinder(I dont know the real name of it) rotates on different speeds. On this block it rotates pretty fast. Does that has to do with different material of the block?

The finished shiny surface looks so good!

[bmxguy08]

Very nice work!! i just dropped another one of my SR20 blocks at my local machine shop. These blocks always have low spots on the front left there by cyclinder #1 I have seen countless kids try and just surface the head and the they piss out oil right there. then they have to tear everything apart again! dont be cheap do things the right way!

[cmkoh100]

Yes, it had been polished off a thin layer of the surface and makes it shiny.

But it seems the polisher plane is not on the same surface of the block. some tilt offsets are there......

[macagnoful]

Talk about stupid... He forgot to resurface the block with the oil pump on......

[rich0585]

I feel that using those purple Roloc scotchbrite disks is pretty stupid to use on a head or block. But I have had alot of success with those 3M roloc rubber bristle disks. They are made to not damage the aluminum surface, just remove gasket material. But I only used it on a Subaru, and you can pretty much glue those engines together... Great video.

[angry4nus]

11 ra is damn good

[hisveggieness]

Doesn't graphite corrode aluminium?

[jcadlols]

@hisveggieness very slowly. Considering he's cutting the aluminium back straight after spraying the graphite, I'd say it's a non issue. It'd be a good idea to wipe the bores and wash the galleries though. :)

[FrankaDith]

Im thinking its you that set your machine off set.

[kenisimoo]

i think this is kid ricers job to sand head with hands

[dirtrider383]

this might be a stupid ? but wud that raise the compression if i did wud it be enuf to notice

[TX97SR20DET]

@dirtrider383 On an SR20. The head alone being resurfaced is enough to where you need to adjust timing or blow the HeadGasket you just put on immediately after startup. Head and block both. No doubt lol

[gokartmaster123]

Wow you guys are great i think i may have my sr20 done here..

[dondebest]

This is from an S14 yes.

[somekiwidude]

i want that done to my car it would go so much better

[williswatts32]

Quick question... I have a motor just like that ... After watching this you completely changed my mind to just reassembling it ... Im wanting to have it machined and possibly have the cylinders honed... What would something like that run typically? I live in the Pensacola Florida area... and im not sure where to start... Thought you may have a ballpark figure i could toss around .

Thanks for the head up on the warping though! I woulda been pissed putting it back together and it leaking

[Drago2600]

Nice work, keep making these video's. Great information.

[fiatnutz]

@dubbelzijdigplakband - Not sure what this engine was out of. Howdy from SoCal.

[fiatnutz]

@benenarmor - It's the average measurement from peak-to-valley.

[BARCDAEH]

Hey John do you take interns at your facility?

[fiatnutz]

@BARCDAEH - Occasionally.

[bcire10]

what type of machine are you using?

[fiatnutz]

@bcire10 Sunnen HBS1300

[AxSxKxONE]

what about chemical removers?

[fiatnutz]

@AxSxKxONE - Haven't had any luck with them so far.

[alfsentra]

Why my DET blow the head gasket? This is the answer...

[fredtflail]

thats a nice finish there.

[Hapsmash]

I had this done to my RB. It's very healthy for your motor. My RB is a daily now. It's important to have this done on a motor you want to last for a very long time.

[Naturepheonix]

WAIT wouldn't that shorten the block?

[YoungJim409]

Yes, but he said he took about four and a half thousandths (of an inch) off. For scale, a credit card receipt on that really smooth paper is about two thousandths, so he took off the equivalent to that receipt folded in half.

You'd have to take off quite a bit more than that before you need to worry about compression changing or the piston getting too close to the valves.

[Naturepheonix]

oh whew!

[fredtflail]

@YoungJim409

its about .070 on an american v8 to increase it one step.

[YAMASAKIZUKI]

well i have a question i took my head to get resurfaced and got it back and they took a little bit off of the intake valves would this make me have to use 2 gaskets or am i fine on 1. oh and the car is a 1996 Mitsubishi eclipse GST 4g63T engine

[topdog781]

Not only compression you should be looking for but also piston to valve contact when your resurface a head and block.

[flippytunes]

so does the combination of resurfacing the block and head affect the compression?

[fiatnutz]

As a general rule, you can see about a .1 point rise in compression for every .010" that you remove from either head ot block. Thanx for the question! JE...

[shakybones007]

while true, in the case of a SR20 you if you are rebuilding the engine you might as well put in a thicker metal head gasket. Something like a Tomei 1.2mm works great.

The factory Nissan ones are about .9mm so you actually lose compression. Which isn't so bad because you can now run more boost and timing.

[MetallicAsian]

It won't affect compression unless you have taken off enough metal.

[jacktheripped]

My machinest here has told me the same thing about Scoch Brite pads. says he's made a fortune off of people who use them not knowing how much damage they can do.

[camaro2z28]

this guy does nopt have the block square on the surfacer hence the edge

[Bowtie41]

I'm starting to agree with you,about everything on the HBS coming out the same way.Either the fixture is out of square,chips,nicks etc.,the bottom end of the block has nicks,etc,or the machine itself is outta level.

John,I know you know your shit.Hell,I was a machinist for 20 years before I got hurt,12 of them in Special Products AT SUNNEN!Been watching lots of your vids the last few days to pass the time,and damn near anything put on the HBS has the same warp!Coincidence,I think not.

[caterpillarnut]

Look at his Dodge 340 resurfacing video. That block is warped differently than your theory would suggest.

[Bowtie41]

Even on the 340 block,it didn't clean up on the first pass on the right side of the block.I dunno,I been wrong before.

[adamruck]

Maybe it has to do with the typical design of a internal combustion motor with the exhaust (hot) and intake (cold) on opposite sides of the block. Any sort of cooling issues either by poor design or maintenance could cause warping in the same patterns as well.

The bottom line is that unless you are actually there to confirm or deny the correctness of the machine, the only thing your post does is to ruin potential business for him.

[ducatiss900]

looks that way but the first cut was only a thou and it looked to me like the cut went all the way across at 1 end but not the other, this is typical of a used block, if it cleaned up in 4 thou as he says then it is normal and within Nissan's prescribed resurfacing limits. John also checked the surface finish, he is a thorough machinist, I would employ him anyday if he wanted to move to the south pacific

[DonKael]

Hey John,

When you deck blocks like this, are there any precautions that should be taken as far as thicker gaskets? I'd assume this would slightly change the compression ratio.

[makeminealarge1]

the old boy knows his stuff..

[DamnTheDoubleNickle]

Man i hope to get a job like this.... roight now im going to a vocational high school and the shop im in is machining....not automotive maching but still i love it. i hope to get a job at a local shop after i graduate.

thanks for the vudeos, everyone is full of information.

[dantheman1998]

is it possible to machine the deck to smooth?

[vietasian]

sooo educational hehe

[fiatnutz]

Same thing can happen w/cast iron blocks and heads as well.

[marek0086]

i had no idea people were dumb enough to grind the head mating surface of their block!

[StephenNZ]

Hi, Is the rotary scour pad only an issue for alloy blocks?

[pokerdotjearsy]

if you don't mind me asking, what method would you recommend for removing left over head gasket material off the block without creating similar damage to this particular sr20 block?

[fiatnutz]

I use a special scraper that has a carbide tip, hard plastic scrapers are also available, but not quite as effective. Thanx for the question. John...

[marek0086]

use a scraper man!......like an oversized razor blade.

[RanchoTitanOR]

oh shittt noiiiice

[diegotrueno25]

video sr20

[nrp2oo9]

dang dude love the vids!!! great info! im guessing u do alot at thise machineshop or is this just you?