Strokers??

[Piper106]

Went back a year and didn't see anything about increasing stroke on this engine.

Is there any room to kick the stroke up past 84.0 mm in a 3.4 or 3.5 block?

I assume that anything is this area would have to be a custom crank and really really big bucks, but then nothing beats cubic centimeters except more cubic centimeters (apologies to Tom Medley).

Piper106

[geoffinbc]

The 3.1L crank is as big as she gets for GenIII at 84mm. The new 3.6L enging increases this by 1.6mm. However I highly doubt it will even work.

[Doubt_Incarnate]

if you search the net there is a canada based company that i think does maximum stroke cranks, like i think 3mm more overall, but it is a few thousand dollars i think. jbody performance or somethig like that.

another option i looked into was offset grinding the rod journals. you sacrifice some strength, but you can increase the stroke maybe 1mm. might be worth it. i never hear of any cranks breaking, so i dont think it would be a problem, as long as its not boosted.

the piston is being pushed up farther, increasing the cr, but keep in mind, they might whack the heads. i think you can bore a 3.1 out 1mm, and add .5mm to the stroke and come up with a 198, or something. iron head pistons yeild like a 12:1cr. someone will shoot this down, im sure, but dont knock it till youve seen proof of failure.

not sure on the 3.4, that doesnt drop into my car easily.

[geoffinbc]

JBP has a forged crank but it is still 84mm