Brian Trubee wrote:

Actually, You could make a wankel run reverse direction, but you'd have to change a few things- namely the end housings and oil pump direction. Not feasable economically, but not technically difficult if you had the machining capabilities.

Actually, not as simple as one might assume.  For example, Mazda's implementation of the Wankel uses assymetrically sized cooling passages to help the engine avoid taking on a banana shape.  If one were to try to run it backwards, the cooling
passages would be exactly wrong, and the engine would have a tremendous tendency to bend into a banana shape.

Russell Kent

 
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