my stroker recipe: good/bad?

[guibo09]

I think it's closer to 89.6mm. but why are you so set on the S50 crank? the S52 crank will work too.

here are some unverified specs i picked up

engine / (bore x stroke) / displacement / displacement with 86mm bore
s50b30 86x85.8 2990cc (2990)
s50b32 86.4x91 3201cc (3171)
s52b32 86.4x89.6 3152cc (3122)

ive never seen anyone use a 91mm, i think there is not enough height on an m20 engine for it to work. i would prefer the s50 crank because it will produce a fairly square engine vs the 89.6 crank. it is also lighter and wont require clearancing cuts on the m20 block. but i guess if a s52 crank falls in my hands i wont say no.

[nando]

well you're talking about the S50B32.. which is an entirely different engine from the S52. the bearing journals are a different diameter as is basically everything about that motor. You can't use an S50B32 crank in an M20 block anyway, but the S52B32 crank does fit.

[guibo09]

well you're talking about the S50B32.. which is an entirely different engine from the S52. the bearing journals are a different diameter as is basically everything about that motor. You can't use an S50B32 crank in an M20 block anyway, but the S52B32 crank does fit.

ah yes that makes alot of sense. so to summarise, S50B30 (85.8 ) and S52B32 (89.1) both work in an m20. the S50B32 (91) is no good for the m20.