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Originally Posted by bluestreak
Hmmm.... Thought it was a 4 cylinder at first. Looks like it can be assembled in 'modules' that can interface with some crazy transmission that can turn each engine on or off if required.
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Well, you can call sorta call it a "4 cylinder" if you're going by the number of pistons moving in there. It uses opposed pistons... basically there's a piston on either end of the combustion chamber:
http://en.wikipedia.org/wiki/Opposed-piston_engine
The difference is that most opposed piston engines have two crankshafts:
Really though, terms like "4 cylinder" are only useful when discussing traditional motors. Calling this a "2 cylinder motor" because it's literally got only 2 cylinders ignores the fact that there's a lot more going on in there.