41 replies to this topic

[bps79]

going to start my engine build very soon but im stuck as to go the 94mm stroker and let it rev a bit more or go with the 100mm.chasing some opinopns from guys with strokers ie safe revs on 100mm.

thanks

Brad

[Lister]

100mm here 7500 redline.

[ONPSI]

100mm and 7500 redline, i doubt with the stroker you will need to rev past 7500rpm the torque from the stroker purely makes up it.

[bazeng]

I take both if mine to 7k. My cams are relatively small though.

[DOUGMO]

I only used to take my old engine to 6500rpm due to the piston speeds, I'll take the new one
to 7000rpm though

[jack be nimble]

i will aim for 7k. dont forget the long rod option as well, with the raised pin height pistons. will allow a few more revs (at a $$$)

[DOUGMO]

you cant do a long rod in a 4g63 block

you can in a 64 block though

[milkandoj]

Ive been reading up on stokers lately, whats everyone opinion on here about cylinder wall scuffing with the 100mm 4g63 stroker?

Sees to be one of the problems with a 2.3 verses a 2L, some people say if you run the piston to wall clearance too loose the piston can rock too much so it rubs on the skirt, i seen a few pictures or people selling stroker pistons second hand and you can see the extra wear on the skirt through the coating but some of them the coating is only for run int anyway, still you can see its rubbing there more. But too tight as you can crack the block.

This is about the only thing holding me back from a 100mm 4g63 stroker, i don't want to have to pull it down to rebuild it like a race engine.

[jack be nimble]

you cant do a long rod in a 4g63 block

you can in a 64 block though

oh yea, my bad. go the 64 block, but the pistons/rods are a bit dearer
i thought i might have seen extraextra pin height pistons for a longrod 63, something about buttons in the gudgeon pin holes and oil rings down quite low? cant quite remember.....

the evo9 pistons apparently have the 1mm offset pins, this should help minimise the scuffing. brian has some je pistons in his 63 and he says they have no offset.
i believe the gudgeon pin offset is essential for just about any engine other than a pure race motor.

[bazeng]

You can long rod on a 2l block. Just uses 61 crank.

[OLDIE]

My stroker has a 7200 cut out and it loves to rev with the Kelford 264/270 cams

[bps79]

so what would be the max revs with piston speed.was thinking of buying some kelford 276/280 cams with adjustable cam gears.would this be too big

[DOUGMO]

very true Baz

heres a good read,

http://www.kidzuku.com/StrokeOrNot.pdf

[ONPSI]

For street use I wouldn't go over 272's

[Lister]

I currently run HKS 272's has no issues with revving, easy to drive on the street.

[BMGTZ]

I have run 280/280 and found them ok. brian crowers arent that wild

[bps79]

thanks for everyones input.its given me abit of an idea about what direction to go.now all i have to do is find the time to drop my block off to get machined

[JETGSR]

mine 7500 cut but if i let it 8000 easy would only need to lift the cut/ on the dyno the graph as on a 75 deg angle at 18psi and at 7500rpm

so they will rev, but yes the torque makes up for the lak of 8k+

just play with gear ratios and you wont need that crazy redline

there is a small amount of scuffing on the piston skirt but nothing to bad.

i'm also running 264/272 kelfords and mine has been taken out to a fraction under 2.4 (2.397)



If you want to talk hi reving robevo i think can rev to 10k on a 2.4 and thats the street car.- correct me if I'm wrong there Rob

[Evo-00x]

The day I decide to build a stroker is the day I start saving for a dogbox!!
The torque you can get out of a stroker or 2.4 is mad... but unfortunately our tranny's can strip 4th gear under load even with a solid 2 litre in place.

[evoreal]

If you want torque out of corners 2.4 if you want high hp top end revs go for a 2.2 you cant have high capacity and high rpm at the same time it just does not work...