Abstract: A system of combining balanced, independent, self-starting and initially separated internal combustion engines, wherein engines not immediately required for power can be shut down. Shut down engines are disconnected from the running engine or engines, and drive train. This system will dramatically reduce fuel consumption and the amount of exhaust gases. A microprocessor determines vehicle power requirements from engine sensors. Hydraulic pistons under control of the microprocessor bring the individual engine units into and out of engagement with each other. Friction plates and locking pins are provided for coupling the crankshafts at predetermined relative angular positions.

Abstract: A system of combining balanced, independent, self-starting and initially separated internal combustion engines, wherein engines not immediately required for power can be shut down. Shut down engines are disconnected from the running engine or engines, and drive train. This system will dramatically reduce fuel consumption and the amount of exhaust gases. A microprocessor determines vehicle power requirements from engine sensors. Hydraulic pistons under control of the microprocessor bring the individual engine units into and out of engagement with each other. Friction plates and locking pins are provided for coupling the crankshafts at predetermined relative angular positions.