> Jonathan Gibson Wrote:
> -------------------------------------------------------
> I thought they did a shorter stroke conrod and a longer stroke conrod or
> is it a shorter and longer crank? Does anybody know what the p4/6 means
> on the engines? Obviously a p6 is a 6 gear but what's with the extra 6
> on a p4 engine? I asked an Italian guy selling some gears on eBay and
> was none the wiser.
P6/4r is a 4 speed variant of the p6 engine, what I have on my cimatti 86.
And yes there are different stroke length crankshafts. Also there are different size and width crankshaft lobes..Con rod length has nothing to do with stroke length. I believe that most of them have the same rod length at 85mm, but I could be mistaken.