| 摘要 |
Inlet and exhaust valve timing is varied in conjunction with reducing the engines compression ratio and increasing drive to the supercharger. Variations include the early opening of one or more exhaust valves and/or closure of one or more inlet valves and/or late closure of one or more inlet valves and/or the closure of one or more inlet valves prior to the end of each induction stroke. Such variations may be implemented using a variable compound timing wheel for a valve operating camshaft wherein the variable timing wheel is particularly adapted to advance or retard valve operation in response to electronic or hydraulic actuation means. The invention further provides for an improved piston for a compression ignition engine particularly adapted so that upon fuel injection and subsequent compression of the air/fuel mixture, the mixture is forced radially outward from the axis of the piston. The piston has a conical upper surface extending radially to the edge of the top surface or partially outwards to the edge of the top surface. |
