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@ishan-nohePN • Jul 13, 2011
As far as I know, pre piston engines are the pre charged piston engines. I have read something about 2S pre piston engines. They are perhaps used in Aviation. Not sure about it. So will avoid giving false information.
But do search for Grail engine, it is one of the pre piston type. Hope it helps you. -
@manyu-bZiDBf • Jul 20, 2011
actually it was my mistake...
i was talking about free piston engines...
these are dual opposed piston engines which generate electrical energy by changing magnetic flux...
sorry for the mistake...