Diagram a tongue of 4-stroke gasoline engine From the speed of the engine, cylinder, there is a short time to get through the tongue, tongue, so account account must be opened prior to dead center on a faster and slower off the back bottom-dead-center, the tongue has a longer time to open accounts. The total range of approximately 300° intake tongue crankshaft. The number of degrees before or after top dead center to bottom dead center, there is a lot or little depends on a number of designs, the rotation speed of the engine.
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