![]() The valves are larger and the pistons are new." Roy Lunn recalled: "We wanted as much displacement - for power and torque - as possible within the confines of bore centers of the tooling. It also has a shorter stroke and larger bore. Noted Roy Lunn, "There are some common parts, but the 4-cylinder includes many unique items such as its own electronics systems. That's the reason that performance and durability were of such prime consideration from the very beginning." Although some of components were interchangeable between the AMC 258 cu in (4.2 L) six-cylinder and the new engine, the four-cylinder was not a cut down version of the big six. We specifically developed it with our Jeep vehicles and Eagle in mind. Īccording to Jeep's chief engineer, Roy Lunn, "unlike most engines available today was not designed for passenger cars and then adapted for trucks. The location of other major components, such as the distributor, oil filter, and starter, were also kept the same so as to use the machine tools for the AMC straight-6 engine. The brand new engine was designed to use AMC's existing spacing between the cylinder bores so that the tooling remained the same. American Motors devoted three years to the development of a new four-cylinder engine.
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