Interesting points Keith..  It sounds as though you might suggest that
an inverted piston engine would hold a combustion event advantages
against an upright engine.  That would be surprising to me..  Or that
the bottom cylinders of a radial would be more efficient.


Matt-

Why would it be any surprise?  Simple physics -- hot gas rises and
disperses cooler gas, so you need more fuel to have enough to light.
There are so many inefficiencies in a piston engine that these are just
a few more in the pile.

Keith W

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Natural Convection (heat rising because of temperature difference) is a very
slow process, and a piston firing repeatedly is a pretty fast process. The
difference in temperature, although theoretically possible to make a
difference, in practice will not. It will be overwhelmed by the turbulence
of the incoming charge.
Bill Schertz
KIS Cruiser #4045
N343BS (reserved)

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