Don Louis Beaman, 8810308 Las Ondas Way, Cupertino, CA 95014

3986363, Oct 19, 1976

Jun 3, 1974

5/475938

Don L. Beaman - Milpitas CA
Eugene C. Beaman - Belmont CA

F01B 2100

60700

An engine synchronizer for synchronizing the speed of a slave engine with the speed of a master engine is disclosed. The disclosed synchronizer includes a comparison and control circuit deriving input signals from the distributors of two engines, e. g. , the two engines of a power boat, one engine being arbitrarily designated the master engine and the other being arbitrarily designated the slave engine. The throttle of each engine is coupled to its associated hand throttle lever by means of a Bowden cable. One end of the sheath of the slave engine throttle control cable is attached to a slidable bracket. The slidable bracket is positioned within its limits of sliding movement by a positioning motor operating through a rack and pinion. Power to energize the positioning motor is supplied by the comparison and control circuit. The comparison and control circuit compares the times of occurrence of the ignition impulses carried by the distributors of the two engines and provides energizing pulses to the positioning motor of such duration and polarity as to position the bracket, and thus the end of the slave engine throttle control cable, to maintain the speed of the slave engine substantially equal to the speed of the master engine.