The intake manifold is just a hollow chamber that holds a cloud of gas and air. The pistons then draw the gas fumes into the cylinder as they go down and closes the intake valve. Then the piston comes back up where the gas fumes are compressed and the spark plug fires driving the piston down. Then on the next stroke the piston comes up where the exhaust valve opens and the burnt gas is let out through the exhaust manifold and then through the exhaust pipe. Because of the heat they couldn't just hook the exhaust pipes to the engine. The cast iron exhaust manifold dissipates enough of the heat the exhaust pipe can handle it.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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