The engine was a 300 hp version of the RXT's.

It featured a 201 cu in, 82 hp version of the flathead six engine.

In 1930-31 seven M1917s were fitted with the 100 hp version of the Franklin.

Virtually, the 138 hp two-barrel version of the 195.6 six cylinder could be ordered optionally.

The biggest change of the model this year was the presence of the two-barrel 138 hp version of the 195.6 six as standard equipment.

In 2011 the new 750 hp version of the D16 was presented to the market.

Harry Knox refined the engine and developed a 3-cylinder 34 hp version of it.

The new engine was considerably larger than the 200 hp version and required an enlarged, bulbous cowling that fully enclosed the guns.

Japan received a higher-performance 170 hp version, known as the FS-ZE.

The five-cylinder was soon dropped as a major engine choice; however, a turbocharged 230 hp (169 kW) version remained.