Mercedes-Benz M04 engine

The Mercedes-Benz M04 engine is a naturally-aspirated, 3.0-liter and 3.1-liter, straight-6, internal combustion piston engine, designed, developed and produced by Mercedes-Benz; between 1927 and 1928.

M04 engine
The side-valve six-cylinder 2,994 cc engine delivered maximum output of 55 PS, but now at the lower engine speed of 3,200 rpm. At the back, however, the final drive ratio was changed from 5.4 :1 to 4.8 : 1, and the listed top speed went up to 108 km/h (67 mph)

Having raised the final drive and the top speed for 1927, the manufacturer now moved to offer a choice of ratios, either reducing it back to 5.4 :1 or raising it further to 5.8 :1. The former ratio was described as the “Flachland” (flat lands) version while the latter as the “Berg” (mountain) version. At the same time a small increase in the cylinder stroke accounted for an increase in overall engine capacity to 3,131 cc. Claimed maximum output was unchanged at 55 PS, still at 3,200, although there was a measurable increase in torque.

Applications

 * Mercedes-Benz 12/55 hp Type 320 Sedan