For 1922, Acme offered over twenty different sizes of their vertical oil engines. Unfortunately, not a single illustration has been located. Acme engines were built in 1,2, 3, 4, and 6-cylinder styles. Within each style were various bore and stroke dimensions. For instance, the smallest engine was a single-cylinder model with a 6 1/4 x 7 1/2 inch bore and stroke; it yielded 8 horsepower. The largest series used an 8 3/4 x IO 1/2 inch bore and stroke. All Acme engines were of four-cycle design.