There's only 24 cc for 1 mm extra stroke.
1 mm overbore will add 46 cc. I would
go for larger bore first and then add a
longer stroke. 88.9 mm (3.5") seems to
be a popular piston size for many engines
and oversize pistons are easy to find.
FJ20 is one but Volvo and BMW have used
the same diameter pistons. Check your
engine block for cylinder wall thickness first.
Thomas
Andy Cost wrote:
> Has anyone tried to offset grind a U-20 crank? My estimate is about 100cc for
> each 1mm offset ground. What is the limiting factor here?
>
> Thanks,
>
> Andy
>
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