jamiehjr

Hey!

I love to hear a small block chevy wind out in the upper stratosphere of RPM. I also love the idea of all the torque a stroker SBC generates. I would like to eat my cake and eat it too. Can a 427-454 SBC be built for less than $10,000 that winds up to say 7200 RPM?

I realize the longer crank shaft stroke accelerates the piston to the speed of sound, generating harmonics, and ultimately deteriorating the piston (GO BOOM). Are there parts strong enough for street duty in a high winding stroker? If so, how can I identify these parts to assemble into an engine?

I'm thinking light weight rods and pistons with heavy duty strength.

The reason I'm wondering about this particular question is because Bill Mitchell's theengineshop.com catalog has 427-454 CID SBCs making between 500-600hp with a disclaimer not to exceed redline of 6000 RPM. I would like the same cubes winding up to 7200 RPM. The Parts Bill uses in his engines are pretty heavy duty. How much stronger must the parts be to expand RPM range?

Thanks!
Jamie

sir_malaki

sorry to say I have never heard of a high RPM stroker. This is one side effect of having one. If you want to have a really high rpm big block you have to destroke (use a smaller cam) - but then you loose the cubes :-(

From the research I done, and from building strokers I have not found any parts strong enough to break the 6K mark - really I wouldn't push it over 5400.

jamiehjr

this is the reply I received from Clarencep@theengineshop.com:

YOU CAN TAKE ANY SHORT BLOCK AND REV IT TO 7200 RPM BUT YOU SHOULD
CONSENTRATE ON THE PARTICULAR CAM YOU ARE GOING TO RUN IN THE COMBINATION
BEFORE THINKING ABOUT THE REDLINE .

TrueBlues

A general rule of thumb is the longer your stroke the lower the redline will be. Long stroke and high rpm combined tend to be very hard on the bottom end.
My opinion, if you have 10k to spend, go with a supercharger and/or nitrous to get to your power rather than just huge rpm's.

combo5400

I find Bill Mitchalls engines expensive, but yes you can have a stroker spin up to 8000, 10000 if your CAMSHAFT can breath that high, and if you plan on driving at that high an rpm; you could get a high stall converter and really low rear end gears and drive the street at 5000 rpms. I suggest a 383 (350 w/ 400 crankshaft) for mains strength, set of billet rods, and some srp forged pistons. You can get this at flatlanderracing.com for cheap, have a machine shop INTERNALLY BALANCE the shortblock to 1/2 gram and build the rest yourself. Oh, and make sure your intake, cam, carb, exhaust, and heads match at a high rpm rating. If you can find some good deals and sales you can wing it at ~$10000.

~500hp
billet goods and strong bearings (clevite h series is good)

jamiehjr

I have been asking around and have received as many answers as times I have asked about revving a stroker engine.

Something that makes me want to urp:
When someone gives the fact that the force is raised exponetially for each 1000 RPM. So the logic is revving an engine 7000 RPM versus 6000 RPM creates exponentially greater force, therefore parts breakage.

This is the urping part; if that were the only rule of thumb, all engines would have 1 RPM rev potential, because 2 RPM is exponentially twice the force (How about 1 RPH?).

Psuedo technical facts are no help and makes the psuedo expert appear smarter. Heaven forbid!