Diagram of valve 4-stroke petrol engine From the speed of the engine causes cylinder packed with a short time to be an inflow valve through the valve to the steam so need to open faster, before dying on the Center and off center in the lower die slowly, after improved steam valve with long opening hours. Include the range of the valve shaft to an angle of approximately 300 verses to hurl. The number of degrees before top dead center or rear dead center below, there is a lot or a little depending on the design of the speed of the engine.
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