Quote:
Originally Posted by Electronic M
Why they are called hemi is that the top of the chamber and the piston are domed rather than flat (which has performance advantages).
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Yes it does. You know, a lot of people say that the dome shape itself has something to do with it, and while it might, the
real appeal of the hemispherical combustion chamber is that there is a
lot more surface area on the underside of the cylinder head. A lot more real estate for much, much bigger valves than you'd have with a more conventionally designed head. And those huge valves allow the engine to breathe so much better. It's the same reason why 4-valve engines became a thing.