does anyone know of a good company that makes complete crate motors 400CID SB TPI? which is better? a 383 stroker TPIor 400 TPI? i need a powerfull, reliable crate engine and so far ive seen the 383 TPI with 500HP, havnt seen any 400's though.

 

Where did you find the 383 TPI? I am looking for a motor and I am having a hard time finding what I want.

 

I doubt you saw a 500 HP TPI 383.... you probably saw a 500 HP 383 (easy enough to make), that somebody had stuck a TPI on after they had dynoed it earlier with some other induction system capable of producing 500 HP, so that they could find out how much the motor was capable of, rather than how little TPI is capable of.

CID is always better.

A 383 is a 400 stroke with a 350 bore. How can that possibly be better than a 400 stroke with a 400 bore??? That question doesn't even need answering.

You don't really need to look for a "TPI 383" or a "TPI 400". Look for a 383 or a 400, and put your TPI on it. Except for the difference between the MAF and SD setups, TPI is pretty much all the same. It doesn't make good sense to look for a motor like that with a TPI already on it, even if you find it, it will cost gigabucks more than you putting your existing one on it.

 

the engine is at www.allchevyengines.com and its a 383 stroker that can come TPI and the guy told me it would be 500HP

 

Either 500 HP, or TPI.... not both. Be real careful what you read into what people say. "Yeah, I've got this 500 HP motor here, and I can put TPI on it" doesn't mean "500 HP TPI motor".

 

ok then , whats the most powerful TPI i csn get?

 

i havent had any experience with this company, but it looks like a pretty cool thing they have goin.

blueprintengines.com

 

TPI itself runs out of breath at around 325 HP of flow, and at about 4500 RPM for acoustic reasons. A few people have got them up a little over 350 with careful tuning and much massaging. If you want more than 325 HP or 4500 RPM no matter what size engine you end up with, you need to be looking at some other form of induction; either a SuperRam, or MiniRam, or Steath Ram, or a carb, or nitrous, or a blower.

There are people who will tell you all about how their TPI "pulls" to 6000 or whatever; don't believe it, it's not true, it's physically impossible, because the same acoustic wave that reinforces a cylinder fill event at 3600 RPM, destructively interferes with cylinder fill events at any RPM above 4500. It's all numbers and physics. (BTW I was a math and physics major in my younger and even more foolish days.) Look at a dyno graph sometime, and compare the shape of a TPI motor's graph to an otherwise similar carb motor's; you'll see what I'm talking about. Their torque will be pretty similar up to 3k or so, then the TPI has its "Mount Everest" at 3600 well above what the carb motor will have, and then begins to fall off, they're about equal again at 4200, and the TPI craters while the carb motor continues out to the limit of its cam and whatever else.

A good example of what TPI does to a motor is the ZZ4. That motor consists of a 350 short block, with a set of aluminum L98 heads on it identical to the later-model Vette TPI ones, and a mild cam, and a humble dual-plane intake. Take it out of its crate, slap on a 750 Holley carb and a set of headers, it will dyno 345 HP. Guaranteed. Take the exact same motor, pop it out of its crate, put TPI on it and a set of exhaust manifolds, instantly it's a Vette L98, and you'll get probably 265 HP. 85 HP difference. Now of course the headers are probably 30 of those HP; but that's still 55 HP difference. Think about it. In simple terms, a 345 HP ZZ4, with TPI, puts out 290 HP. The stronger the motor is, the more of a handicap TPI will be.

 

It's pretty simple, if you want a high horsepower EFI motor
you'll need to ditch the factory TPI long runner intake for some thing tuned to a higher rpm (shorter runner) and more airflow.

The TPI just isn't going to cut it. Like RB said, its a matter of physics.

 

yes i was planning on getting a stealth ram intake but will that be able to support 700HP? there is also a internal supercharger that will be going on along with it.

if i was to ditch the fuel injection ony my 87 IROC and go over to carbed, what type of wiring/computer programming will i be looking at? the only reason i wanted Fuel injection was for that nice instant throttle response but if i can get a 700HP carbed small block then ya id def take that. now the question is, who makes a complete 700HP crate small block engine (non supercharged and on pump gas)?

 

Bill Mitchell sells 427 SBC crate motors might want to check them out. http://www.theengineshop.com/engine.shtml

 

http://www.amerspeed.com/engine_prices.htm

400 HP TPI w/24 month warranty

 

The Stealth Ram, N/A, is good for a max of around 450 HP.

700 HP for a street car out of any N/A motor is ridiculous. HP = torque x RPM / 5252.11; since torque is a function of the number of gasoline molecules burned, a motor's peak torque in ft-lbs should be around 1.25 times its CID; so for a 383 for example, peak torque should be around 480 ft-lbs at the crank; so to get 700 HP out of a 383, it would need to make its 480 ft-lbs at around 7650 RPM, and the intake side of the induction will have to flow around 350 CFM. It's all numbers.

What's the most HP you've ever driven?

I have no clue about who makes "crate" engines. I build all my own. I'm a car builder, not an appliance operator. If you can't build it yourself, go hang out at your local circle track, and pay attention to who builds the motors for the various cars; find the shop that builds them for the cars that win; then pay him whatever he asks, don't chisel him on the price, it's worth it. It'll probably be cheaper than shipping, and you might get some real valuable advice in addition to getting as good or better of a motor than you could get in the mail.

 

ive driven a 78 camaro with 500HP as my most powerful driven car. i actually found a 427 from the help of "ME Leigh" that i am intersted in and just need to save a few more thousand to pay it in cash. i guess i will be going carbed its 620HP on pump gas and at least i have the cowl induction hood for a carbed engine.

 

woops i meant the engine is 530HP.

 

Bill Mitchell now sells 454 SBC's!