This is an interesting bit of rotary engine technology
I saw at the Wankel factory. It is a rotor from a charge
cooled engine. What this means is the intake charge is
passed through the rotor to cool it before it is
introduced into the compression chamber. This usually
results in less charge getting in and less HP as the 
rotor heats the charge expanding it somewhat.

This rotor looks like it was hogged out of a solid block
of steel, phaseing gear and all. Impressively simple.
 
Paul Lamar
 
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