kumar75150

Has anyone on here done a destroked motor with heads/cam? I was wondering what kinda results if you did lets say a 4.125 bore with the crank out of 4.8L motor?

How high could you spin a setup like this?

SStrokerAce

iTrader: (2)

It has a 3.27" stroke so with a 4.125" bore it makes a 350 cube motor.

That stroke/bore combo is about what NASCAR motors are. So if you had the parts all strong enough you could go to 9K rpm pretty easily.

On a stock crank it would be safe probably to about 8K.

The question is why?

Bret

HOTROD98Z

iTrader: (1)

The gm camaro with a 302 is a destroked motor, and revs to about 7400 i think, it sounds sick.

Pro Stock John

iTrader: (34)

I have a 4.8 crank for sale, $100 shipped it has less than 500 miles on it.

One reason to do this would be to build an engine that fits classes that are cube restricted.

Another reason is nostalgia.

Pro Stock John

iTrader: (34)

Could also run a 6.200 rod with the 3.27 crank.

Excal

as long as the engine takes it more rpm the better..

SSCamaro99_3

iTrader: (1)

I know of a destroked 302 LS1 that spins to 8000 rpms.

Bink

hmmmm.....what kinda HP @ 8000???
joel

SSCamaro99_3

iTrader: (1)

He ain't talking. Very little is known about it.

Pro Stock John

iTrader: (34)

Westech built the 302ci motor that's in one of the GM showcars.

kumar75150

With light/expensive valvetrain components, couldnt you spin one of these motors over 9000rpm?

Strokers are good for the track but on the street I'd rather have a high revving motor that makes crazy hp up top. Torque down low just spins the tires on the street.

Deckhand

iTrader: (1)

like a 4.8L with a big bore.

hence the big bore, small stroke ... prolly a good turbo application.

Cstraub

iTrader: (1)

Problem is short stroke big bore engines don't really feel good till upper rpms and really for a street car moderate driving they are no ideal. Now if you want something to rip on the weekends and leave from a dead stop at 6000, then yes the are fun.

Depending on airflow a 302 inch motor can make around 600HP, but that would not be streetable.

Cstraub

Linear Velocity

iTrader: (1)

My car feels good at high and low RPMS

Pro Stock John

iTrader: (34)

Kumar, you would need an intake that works up there, and you would need a lot of good parts.

Heck 8000 rpms would be a huge difference from our motors you would not need 9000. It was sick sounding listen to a friend wind out his S2000.

You would need lightweight valvetrain parts, and maybe a custom intake.

kumar75150

I used to have an S2000.

I can only imagine what a Ls1 at 9000 would be like. I talked to a few people about this and it can be done but very very expensive. Mainly, I would need a really light rotating assembly.

Old SStroker

8 cylinders at 4500 rpm have the same number of exhaust pulses per minute as 4 cylinders at 9000. If one were to plumb the exhaust correctly, the sound would be somewhat similar. 180 degree headers and outlet(s) on the same side come to mind. You could then tell the 10000 rpm aftermarket tach it's a 4-cylinder and impress all your friends. Certainly cheaper than building a viable 8000+ rpm engine. Probably more power to boot!

Evo98z

I don't see the benefits of doing this unless, as stated above was to make a certain class. Also I would think that you would need a external oil pump and a good oiling system to keep up with a engine that spins 9Krpms. Piston speed is a concern and you would have to run a long rod. I would think that it would be to hard on parts to run it at 9k rpms, but it would be bad *** to hear a ls1 rev that high.

racer7088

This would be a great way to reduce the power of the LS1 down to where you could hook up better on almost any surface and not go too fast in the quarter mile also. Hey, it would be easier to drive in the rain too! It would also probably cost a lot of money and no one else will probably do it (at least no one that's not crazy!). You could be one of the slowest but yet highest rpm LSx guys out there (sort of like an american ricer (or ninja!))! I'm not sure I would want that title but there's always someone that does.

Even with all that going for it at least it wouldn't be too reliable and would require a lot more maintenance and that's always cool. You could put really long rods in it too which should generate tremendous internet power and envy (Hey, and they'll weigh more too!). It would be kind of like a real race motor without the real power but yet still with the real cost. Not trying to be overly sarcastic but it's hard to beat an idea like this unless you think on it more than a minute or so. OTOH if you value rpm over power and reliability then go for it. It's been done often with some truly apalling results but you'll be always be guaranteed to be the "unique" one if that's what people want. You could also paint the car lime green and purle metal flake too.

ChrisB

Or just build a stroker with as much power as you can and then buy a nice aftermarket/race traction control - you don't have to worry about traction plus you go faster.

It seems to me builidng a motor for less power is a somewhat backwards approach - you could achieve the same thing by not going full throttle (reduced power output). Money (traction control) or skill (driving ability) - both would still be cheaper, better, and probably faster than builidng a 9000 rpm "street" motor.