Timing mechanism for engines

Claim 1

A timing device for regulating an adjustable fuel injector timing element of an internal combustion engine to correlate the timing of fuel injection with engine speed and load conditions throughout a broad operating range, the engine having an inlet manifold for receiving air from a turbocharger driven by the engine, a coupling member being movably arranged in a housing to position the fuel injector timing element, comprising first means coupled with the fuel injector element and responsive to engine speed at least during relatively low speed operation of the engine to regulate the fuel injector timing element, said first means comprising passage means for communicating fluid under variable pressure from the engine to a chamber in communication with said movable coupling member, the variable pressure being generally proportional to engine speed, second means coupled with the fuel injector timing element and responsive to engine speed and load at least during relatively high speed operation of the engine, said second means being communicated with the manifold and responsive to variable pressure therein, and retarding means operatively coupled with said first means, said retarding means tending to resist regulation of the fuel injector timing element by said first means while said engine is operating at less than a low idle speed.