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Each piston has one TDC position, when it is at its maximum height. During the four stroke cycle, each cylinder has two TDC events. Those are compression and exhaust.

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Q: How many top dead center in a four stroke engine?
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Why initial pickup is better in two stroke engine as compare to four stroke engine?

The two stroke has more initial pickup because combustion happens every time the piston is at or near the top dead center. In the four stroke, combustion happens every other time the piston is at or near top dead center. <><><><><> Since the combustion cycle occurs every rotation, instead of every other rotation, there is twice as much torque available to the engine output.


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compare the two stroke and four stroke engine in power output and thermal efficiency?


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