Originally Posted by BuRPsa
Come on BikePilot,
and nice car so btw, but that engine has a large part of the combustion chamber in the piston crown, a large indentation, plus it is a blown engine - hence it follows that those are hardly the lightweight piston type as the above Ross is, so that apple-pear comparison aint valid. Also, that engine's way better cooled than our pigs, marginal springs to mind.
nice pistons indeed - keep us updated if you buy one please?
I think Porsche made 14 blown 968s, which, sadly, mine is not. It's N/A. I wouldn't call the XR650Rs piston a lightweight type piston, but that's a relative thing I suppose. Anyway, just one datapoint.
US octane is roughly the same as ROW, it's just commonly measured differently.