Originally Posted by alexus87
While the S54 was indeed an updated version of the S52 and was not based on the M54, the S52 you guys had in the US and the European S50 were both based on the M50 and were not bespoke engines. As such the S54 is just an updated version of an engine that was itself a performance version of a regular AG one.
Yeah, if u consider sharing the same engine block as "based on." I am assuming the S50 uses the same engine block as the M50 u mentioned. S engines have very aggressive cylinder head design, which enables them to rev way higher than series engines. That required a lot of higher strength internals to cope with that. To me, the "based on" portion of the equation is rather meaningless considering how different they really are everywhere else.