Posted by Jim Becker on September 12, 2011 at 16:42:35 from (173.57.144.251):
In Reply to: First hemi?? posted by Bud DeLong on September 12, 2011 at 10:15:16:
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Makes absolutely no difference in that respect. The various pressures, amount of surface area, and force directions all balance out. You get the same push as a flat top piston.
Where it does matter is in the quality of the combustion. The coldest part of the combustion chamber is at the surface. Combustion is best where it is hottest. A spherical shape has the greatest ratio of volume to surface area. A hemisphere comes closer to that ratio than most other combustion chamber shapes. The old Chrysler hemis had a more or less spherical shape to the chamber in the head, with flat top pistons, thus the "hemi" name. This idea is somewhat theoretical and other shaped combustion chambers with carefully designed quench areas do quite well.
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