| 摘要 |
A manual or automatically operated valve assembly is situated between one of the carburettor barrels and the intake manifold leading to four of the cylinders in an 8-cylinder engine or three of the cylinders in a V-6 engine. When open, the engine functions normally, but when closed, four of the cylinders are cut off from the carburettor so that the engine operates on only four cylinders. At the same time air intake ports open up so that a controlled amount of air is drawn into the inoperative four cylinders and exhausted through the exhaust valves so that these four cylinders will operate against a relatively low compression as well as acting as a vacuum breaker in order to stop oil pumping passed the piston rings. Control of the amount of air is by varying the size of these air intake ports.
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