Quote:
Originally Posted by Henry Schmidt
If you want to make good compression with the 66mm crank you may be forced to use the 89mm 2.5 ss pistons.
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Engine we did with these 89s on 66 came out at 10.2 with single plug.
Would be cool to do an engine with the short stroke 2.5 89s and the long stroke crank which would come out at around 11:1.
If I had my choice for an ~2.7 liter engine on a long stroke crank, I think I would give up 65 cc and go for the higher compression of the 89s rather than the "high compression" 90 mm piston.