At the bottom of the stroke are scavanger ports. If you are looking at just the cylinder, the ports are about half way down the walls. When the piston reaches a point low enough on the stroke to uncover this ports, air is pushed into the cylinder from a blower, and/or turbo, and exhaust gases are pushed out the exhaust valves. As the piston begins to rise on the following stroke, the piston and rings seal off the ports, and the exhaust valves close. The piston continues to rise. the increase in pressure causes a rise in tempeture. Slightly before top dead center, fuel is injected into the extremely hot air, and begins to ignite from the tempeture of the compressed air. As the pisto begins the downward travel, the expanding gases push the piston down until the scavenger port are again uncovered. Scavenging replaces both the intake and exhaust strokes, leaving a power stroke, and a compression stroke. every time the piston travels downward, it is on the power stroke, while everytime the piston travels upward, it is on the compression stroke.
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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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