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 - Usin Your Implements: Plow and Disc - by Curtis Von Fange. Introduction: Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he rea
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