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Hemi said:This is the first time I came across an aftermarket piston supplier being cited as an authority on combustion recipe fundamentals
gruntguru said:A true "hemi" would have flat piston crowns.
My interpretation is that a spherical combustion chamber compresses the gas into a sphere and a hemispherical chamber compresses the gas into a hemisphere - which would require a flat piston crown.RodRico said:Hemispheres, on the other hand, are domed. I have been unable to find a photo of heavily domed pistons when googling "formula one piston" or "NASCAR piston." What I keep finding are flat pistons with shallow cutouts for the massive valves those engines use.
The ideal combustion chamber is spherical for its low surface area to volume ratio. Other factors dictate departures from that shape.