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a type of internal-combustion engine in which the inlet and exhaust valves are in the cylinder block at the side of the pistons 侧置气门发动机
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overhead-valve engine
So we improve the old truck gasolineenginewithsidevalve byraising its compressionratioto 7.2: 1by using partialsphericalchamber. The intakesystem is alsoimproved.