Big Block Twin Turbo 7.0L Cadillac video 2

The build is a 1935 Chevrolet. Ok, since the last video was taken, I've installed the painted cab, and completed most of the build. I designed the steering system around the original 1935 Chevrolet front end. You'll see the engine better, and hear it run. You can here the twin turbos whine, while I rev the 425. It was necessary to leave the original cam, so the power brakes would have plenty of vacuum. The engine pulls 21hg vacuum at 600 idle. The original transmission is a TH400, and Cadillac built them stout to take the 500ftlbs of stock torque. Most people don't know that these engines were capable of this much power, because the book numbers are with all accessories running, and a restrictive airflow. The turbos I installed are sized for a 3.5L engine, and will produce 25psi, while spooling right away. They will not reach the surge limit, because the rev limit of the engine is 5000 rpm. I am using stock dished pistons, because the original compression ratio was 8.5:1. When I checked the cylinder pressure while cranking, it came to 150psi in all cylinders. This computes to 10.2:1 compression under dynamics. The engine power estimates at 6psi boost are 650hp and 680ftlbs. The limits of the engine are 16psi, and 1100hp. This is the calculated elastic limit of the stock rods, though the heat at 235 psi cylinder pressure before combustion, will melt the edges of the pistons and throw the internal balancing off. I will only be pressing the envelope to 8psi on 92 octane. More to come, and I'll post a video of the first road test.

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[twinturboengineer]

CAD500 Parts online can give you guys some really great parts. I've purchased many upgrades, but the engines are not junk. I'm driving around in my '35 twin turbo coupe today, and it'll blow the doors off any production street car in Portland Oregon. I'd say to anybody who knocks a custom Hotrod like mine: you've got Mutten in your skull. Go eat some more haggus, snake breath!

On a lighter note... you are right the 472 is a more powerful engine when naturally aspirated, but too high comp ratio.

[twinturboengineer]

It's a 425 cid '78 true flat top, came out of a DeVille. The last of the all Iron engineered Cadillac's. It was used for several years due to it's long lasting high nickel block. It's one of the lightest big block's because the bore and stroke are almost identical. Power of a big block, weight and rev's of a small block. FUN!

Oh yea... It's way wider than a small block! Different angle... so if you're gonna try to fit in where your SBC came from, you'd better start cuttin!!!

[twinturboengineer]

You'd all like to know where to get info... Anyone can build one of these!

Just go to theturboforums (not my site) they've got the calcs and everything!

but your welcome to ask how I applied them.....

[twinturboengineer]

I apologize for not posting any more Videos, It's hard to get a video, when your' driving your beast around town. I'll have someone take one soon, so I can post, it's getting close to complete...

[M3RVITIS]

this should get more views

[twinturboengineer]

It's similar to the fastest Cadillac in the world. Last weekend Spectre broke the world land speed record on gasoline, with a 500 cid Cadillac... that's the big brother to this motor, with twin 88mm turbos!!!!!

[stevenbellll]

i too have been working with cad500 parts. theose are highly underestimated engines. and lightweight.. i love the car man, i bet its crazy fast.... but if it were mine i might tuck the turbos a little closer to the engine, but it looks great, nice ride man.

[casswat]

Now that's what I call an alternate hard-on :) Mine don't sound like that, I gotta step it up :)

[pmd7771969]

i still know how to get 2000 horsepower from a cad 500. i did work on them for 15 years. then switched over. to much up hill battling the cadillac motors to have fun with them. they have some good points such as a 4.500 bore u can take them out to without fill.

[pmd7771969]

i see u cant post as much text as u want to. this thing broke up my message. part 2 is first sorry.

[pmd7771969]

i did cover several 1500 horsepower cadillac 472 motor in my book. hope to get the book published in 8 months.

[pmd7771969]

horsepower with a 427 chevy tall deck truck engine at 8500 rpm. i made close to 1500 fpt also. if us chevy guys are wrong. then why are there no cadillac aftermarket blocks made and used in pro mod 1320 racing. i went through a lot to get my 2 cadillac motor to make the kind of power my chevy did. try 911 horsepower normally asperated. cant do that with a cad. even with the new boogle man heads. and at 4500 for cnc ported they can keep them. my heads flow 520 cfm after i ported them.

[pmd7771969]

well i did write a book on this subject thats 400 pages long. ok where to start. the cadillac motor is a poor performer because u cannot get cylinder heads that flow in the 490 cfm range. combined with a large stroke u have a limited rpm range or about 2800 to 5500 rpm. that sucks for a street engine. if tork is all where its at then why do the cadillac thumper and other cams strat out at 2500 rpm in the power band. obviously to get them spinning. secondly i made 2300

[pmd7771969]

in pro mod 1320 racing. i went through a lot to get my 2 cadillac motor to make the kind of power my chevy did. try 911 horsepower normally asperated. cant do that with a cad. even with the new boogle man heads. and at 4500 for cnc ported they can keep them. my heads flow 520 cfm after i ported them. i did cover several 1500 horsepower motor in my book. hope to get the book published in 8 months.

[pmd7771969]

the cad429 is another suck ass motor to build. its not related to the 472 500 they only look similar.

bloodviking

[cadillackeeper]

@pmd7771969 WRONG