346ci FI vs 408ci FI
Originally Posted by VINCE
7krpm is high rpm to me.. I am not talking about my Supra.. Show us this graph of a stock LS1 spinning to 8500rpm please. Do you have a video?
I hope I don't need to explain that a stock LS1 does not mean it was 100% stock. I am talking heads, block, crank, cubes, etc. The point was that 7k is not high for a small motor (3.622" stroke).
Edit: only hit 8200 on that pass. Although it was on the limiter for about a second which probably didn't extend the engine's life very much! lol
Or was it free-revving it to 7k+ over and over while chasing down some problems that set it up for an untimely disaster.
Last edited by LTLHOMER; Apr 22, 2007 at 12:07 PM.
Originally Posted by 52172
Yea I'd like to see it also. A stock ls1 spinning to 8500 will go KABOOM very quick. If that is medium RPM what do you call high?
Thread Starter
Joined: Nov 2001
Posts: 8,259
Likes: 4
From: Valrico, Florida
Originally Posted by LTLHOMER
For a 3.622" stroke motor, I would say HIGH is near 9500.
Originally Posted by 52172
I just looked he hit 700 on a mustang dyno with 93 which is 750 dynojet. He gets some very high numbers. I am stuck with 91 here in Ca and am shooting for 650+ rwhp and a single turbo and large FMIC. I will be very happy if we hit 700 rwhp.
hence 408... now take it to 15+ psi we will be talking 800+
Originally Posted by SVC707
91 octane pump gas/ 9psi 707rwhp/ can be done with the right combo build
hence 408... now take it to 15+ psi we will be talking 800+
hence 408... now take it to 15+ psi we will be talking 800+
Originally Posted by VINCE
This is the first I have ever heard of anyone spinning to like 9500rpm. I personally have not seen a SR setup spinning higher than 8krpm. This is all news to me...
Even look at classes like NMCA pro-stock. I know Chris U spins his 358 SBF to 9500 all day. Not bad for a high 8-second n/a motor with an automatic at around 2900-3000 lbs I believe on true 10.5's.
What is your e-mail? I will send you a capture of one of my big stuff logs so you can see what kinda rpm we hit on that 8-second pass. Unless you have big stuff software and I can just send the actual log file and you can check it out in detail.
I tried to upload a screen shot and it doesn't come out very good as you can see here:
Originally Posted by 52172
I am workin with 348 cubes and all the addtional mods. Hope to hit 700 rwhp. Should dyno in about 1 week.
Thread Starter
Joined: Nov 2001
Posts: 8,259
Likes: 4
From: Valrico, Florida
Originally Posted by LTLHOMER
NHRA Pro-stockers go to 10k with much bigger motors.
Even look at classes like NMCA pro-stock. I know Chris U spins his 358 SBF to 9500 all day. Not bad for a high 8-second n/a motor with an automatic at around 2900-3000 lbs I believe on true 10.5's.
What is your e-mail? I will send you a capture of one of my big stuff logs so you can see what kinda rpm we hit on that 8-second pass. Unless you have big stuff software and I can just send the actual log file and you can check it out in detail.
I tried to upload a screen shot and it doesn't come out very good as you can see here:
Even look at classes like NMCA pro-stock. I know Chris U spins his 358 SBF to 9500 all day. Not bad for a high 8-second n/a motor with an automatic at around 2900-3000 lbs I believe on true 10.5's.
What is your e-mail? I will send you a capture of one of my big stuff logs so you can see what kinda rpm we hit on that 8-second pass. Unless you have big stuff software and I can just send the actual log file and you can check it out in detail.
I tried to upload a screen shot and it doesn't come out very good as you can see here:
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If folks can afford a 4.000 crank, I'd say why not. Heck my 346ci has to boost to nearly 24psi to make 867rwhp thru a T400, and a 400ci with the same turbo would probably only have to boost around half of that... Then again bigger cubes can push a combo into some 7 second classes.
Originally Posted by Pro Stock John
If folks can afford a 4.000 crank, I'd say why not. Heck my 346ci has to boost to nearly 24psi to make 867rwhp thru a T400, and a 400ci with the same turbo would probably only have to boost around half of that... Then again bigger cubes can push a combo into some 7 second classes.
Originally Posted by SVC707
so youre gonna take it up in boost. good luck on the build. is your goal 700?
I was gonna post about 346 cid motors spinning high, but LTLHomer schooled us... I had heard/read 8500 rpm, but NOT 9500 rpm!!! 
That could do quite a bit with a large turbo despite the small cubes.
That could do quite a bit with a large turbo despite the small cubes.
Originally Posted by bboyferal
I was gonna post about 346 cid motors spinning high, but LTLHomer schooled us... I had heard/read 8500 rpm, but NOT 9500 rpm!!!
That could do quite a bit with a large turbo despite the small cubes.
That could do quite a bit with a large turbo despite the small cubes.
benefits of more cubes is simply more torque, and more power in low and midrange which is where you spend most of your time if you are a street car.
The guys running 402's with boost are making fantastic power.
if you got the cash do it otherwise make up the difference with more boost.
lt1 homer, were you using the stock oil pump system or did you go aftermarket like ls7 style?
High rpm's are nice but are hard on internals and usually Ruin's People's Motors. I had a 94 Integra GSR back in the day that was a 13.3:1 compression'd motor that I spun to 9 grand that was a trip.
The guys running 402's with boost are making fantastic power.
if you got the cash do it otherwise make up the difference with more boost.
lt1 homer, were you using the stock oil pump system or did you go aftermarket like ls7 style?
High rpm's are nice but are hard on internals and usually Ruin's People's Motors. I had a 94 Integra GSR back in the day that was a 13.3:1 compression'd motor that I spun to 9 grand that was a trip.
Originally Posted by Pro Stock John
Don't listen to Sean talk about spinning a stock crank 346ci to 8500, didn't yours die an ugly death? Right back atcha smartypants. 
Or maybe it was the used eagle rods? Or just the insane amount of power...hahaha you're my fave John!
Originally Posted by Got Me SOM
benefits of more cubes is simply more torque, and more power in low and midrange which is where you spend most of your time if you are a street car.
The guys running 402's with boost are making fantastic power.
if you got the cash do it otherwise make up the difference with more boost.
lt1 homer, were you using the stock oil pump system or did you go aftermarket like ls7 style?
High rpm's are nice but are hard on internals and usually Ruin's People's Motors. I had a 94 Integra GSR back in the day that was a 13.3:1 compression'd motor that I spun to 9 grand that was a trip.
The guys running 402's with boost are making fantastic power.
if you got the cash do it otherwise make up the difference with more boost.
lt1 homer, were you using the stock oil pump system or did you go aftermarket like ls7 style?
High rpm's are nice but are hard on internals and usually Ruin's People's Motors. I had a 94 Integra GSR back in the day that was a 13.3:1 compression'd motor that I spun to 9 grand that was a trip.
Actually I saw their new red camaro on Friday night and it was dry sump.
I think the 35th anniv t/a still has the accum setup.
My only reasoning for the small cube motor was torque-I don't need it. It's just gonna break more drivetrain parts that just cannot keep up. If it was a race car, then I would of built the stroker.