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 - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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