A two cycle engine having multiple cylinders which is capable of expanding from two or four or more cylinders. A composite crankshaft is built up by combining components including crank webs, bearing shafts and crank pins. A composite crankcase also may expand to accommodate the number of cylinders required...http://www.google.de/patents/US4714060?utm_source=gb-gplus-sharePatent US4714060 - Composite engine
