This presentation on gas engines, especially Caterpillar engines, is n
ot a scientific study. Its aim is to explain, in a simple and accessib
le way to non specialists, the working specifications of the engines,
the technical problems raised and how to solve them, both from a profi
table and pollution point of view. Competitiveness and cleanliness of
gas as an energy source explain the development on heat recovery and m
aintenance which provides cost saving technical solutions.