CHRISPY

Hi guys,
I am just curious what the largest stroker crank is available for our cars now?

Is 4.25 available?

It would be cool to have an NA based 4.15 bore 4.25 stroked combo prowling around <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
460 cubic inch torque monster!

12:1 compression, 255/264 112LSA .630/.645 lift cam with a nice set of heads would cook pretty well methinks <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
Bit of LS1Edit tuning and you are good to go haha!
Cheers,
Chris

RyanJ

i think in real life you and me would get along fine. i am dreaming up these combo's every minute....ask Trevor or the Colonel. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

XtraCajunSS

iTrader: (2)

4.25" is available from Lunati at the least.

Shane

ramair

I've heard that its not good or efficent to go with a bigger strock and a smaller bore. Most motors that perform better always have what they call a square combination like 4" stroke and 4" bore or just a bigger bore than stroke.

BlackMagicSS

A 4.100 bore and 4.25" stroke is a 448. 4.125 bore is 454. That's the largest available right now. I don't know anyone with a 448 but I know someone getting their 454 built as we speak and staying hyd.

XLR8NSS

iTrader: (4)

I think 4.25" is readily available. Give Nick a call he probably has one "On the shelf and ready to go" <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" /> . I think he had my whole motor "on the shelf". <img border="0" alt="[jester]" title="" src="graemlins/gr_jest.gif" /> Don't talk to him too long though because you will spend more money than you planned. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

My only concern with a crank that big and a lined block is the sideloading on the cylinder wall. The only good thing is that the big strokers make so much power down low that you really wouldn't have to turn a whole lot of rpm so I don't know if it would be a concern or not.

What about piston speed? With a 4.25" crank spinning 6000rpm the piston speed would be around 4250ft/min. Is that ok?

edit - I had 4250ft/s <img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" /> That would be bad. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

John <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />

<small>[ May 23, 2002, 05:17 PM: Message edited by: XLR8NSS ]</small>

LEO

iTrader: (3)

There is a guy in Round Rock, Tx with a MTI 449 cid stroker.

CHRISPY

If you were running a 4.25 stroke/Bore combo that would be 482 cubic inches <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

With a good set of ported LS1 heads (330cfm @.600 lift) and a sensible cam (260/265 .580 lift, 112LSA) you could make MAD RWHP and RWTQ and keep the rev limit sensible (6600rpm) and run healthy compression to help overcome the intake restriction. (Say 12.5:1)
I would think 550RWHP and simliar torque at only 6500rpm would be easily attainable and reliable on 94 octane pump gas! LOL!

hmmmm, hope my new job/raise comes through LOL! <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

Cheers,
Chris