Developed in the late 1980s by the Ford Motor Company, the Ford Zeta engine was a straight-4, double overhead cam internal combustion engine with which Ford had intended to replace the analogous Pinto and CVH models.Ford designed the Zeta to share some parts with other Ford engine developments at the time, including the smaller Sigma I-4 and Duratec V6. This engine shares its bore and stroke dimensions with the 2-valve CVH engine.