Development and Operational Results of the MAN FM Combustion System

This paper describes the development and testing of the FM combustion principle which combines the mixture formation process of the M system with electric spark ignition and thus brings together the advantages of the traditional diesel and gasoline engines.

The FM process is particularly suitable for burning gasolines. What is more, practically all liquid fuel cells can be used without any restrictions as regards the octane and cetane numbers. This is possible at the same compression ratios as normal diesel engines.

FM engines operated on gasoline attain the same economical, low specific fuel consumption as diesel engines at all load and speed ranges. The peak pressures are lower, and the CO and unburned hydrocarbon contents of the exhaust are greatly reduced.