I’ve hear this term all the time. I think I heard the teenagers when I was a kid talk about “hemis” too. “You gotta get a hemi George!”. But I have – and had – little idea what this term means, or why I’d want it. I’ve always assumed – well really guessed – it is short for “hemisphere”, and that it must have something to do with the shape of something. The shape of the combustion chamber maybe? But if hemispherical was the best shape for the combustion chamber, wouldn’t all engines use that shape, so the term would be redundant?
'lil help … what exactly is a “Hemi”?