Engine analyzing device

An engine analyzing device for testing both ignition and combustion power of a multiple cylinder engine comprising:

• the combination of a housing including a plurality of directly observable adjustable spark gaps having electrical connections on opposite sides thereof and a ground connection spaced therefrom, means for electrically connecting the high tension ignition lead of each of said cylinders to one side of its respective gap and the spark plug of said cylinder to the other side thereof, and a plurality of switches for each such cylinders and movable to first, second and third positions wherein the first position connects the spark plug side of said gap with said ground whereby high tension voltage is directed through said gap and then to ground of each respective cylinder, said second position makes no connection between said gap sides and ground whereby high tension voltage is directed through said gap and then to the spark plug of said respective cylinder and said third position interconnects said opposite sides of said gap whereby high tension voltage bypasses said gap and is directed directly to said spark plug of said respective cylinder whereby each of said gaps may be adjusted while said engine is running and whereby each of said gaps may be simultaneously observed both when said engine is running and when not running.