An internal combustion engine for a vehicle provides variable displacement by selectively driving one or more engine crankshafts mounted within a single unitary engine block. In several embodiments the crankshafts are connected to a common output shaft with a one-way clutch between the common output...http://www.google.fr/patents/US7032385?utm_source=gb-gplus-shareBrevet US7032385 - Multi-crankshaft, variable-displacement engine
