| 摘要 |
<p>This invention provides a method of converting a four-stroke reciprocating piston engine (10) into an efficient two-stroke engine breathing through the original overhead valves (18). This is achieved by providing a reciprocating positive displacement pump (22) having respective pumping chambers (26) arranged with their outlet (33) adjacent the inlets (34) of the engine (10) and feeding a group of power cylinders (12). The pump (22) is driven through a step-up drive from the engine (10) and the timing is such that each pumping piston (25) leads alternate ones of the power pistons (11) in the group fed thereby to their respective Top Dead Centre positions, the inlet valve (18i) to each power cylinder (12) to be fed opens before Bottom Dead Centre and closes before TDC, and the outlet valve (18e) from the fed power cylinder (12) opens before BDC and closes before TDC.</p> |
