A compressed air supply system includes an engine (50). The engine has at least one combustion chamber defined by a cylinder (54), a piston (52) operable to reciprocate within the cylinder, and an injector operable to inject fuel into the cylinder. The eng...

In a dual fuel engine operating on a main liquid fuel and a gas fuel, a pilot injector (390) is used to inject a pilot liquid fuel in the gas mode. In order to avoid knocking in the gas mode, the compression ratio of intake air is relatively low. When, for...