THere's a more subtle,
yet critical difference. Usually the wrist pin isn't exactly centered
in the piston- it's offset a few ten-thousands to help counteract the
twist imparted by the con-rod as it sweeps around. Or, in the case of
tilted engines (Dodge slant 6, many BMW) to counteract the twist and
gravity combined!
Or so I've read...
Toby
Dan and Louise Yates wrote:
>
> Is there a front and back to the pistons? I can't notice a difference but
> I've seen postings referencing the front or the back of a piston. The only
> difference I can think of offhand would be if there were oil holes that had
> to match with the rod bearings.
|