There are four strokes to a four stroke engine. Intake is the first:this is the piston going from top to bottom with intake valve open, 180 degree turn of crank. Second is compression with piston coming to top with both valves closed, 180 degree turn of crank. Just as the piston nears the top ignition takes place either by spark plug or injector on a diesel. After the compression stroke the piston goes down on the power stroke with both valves closed, another 180 degree turn of the crank. At the bottom of the compression stroke the exhaust valve opens expelling the spent fuel as the piston comes to the top, hence the exhaust stroke also a 180 degree turn of the crank. Now we start over as the intake valve opens. So to my estimation you get fire once every two turns of the crank on any particular cylinder. Each stroke is 180 degrees and there are 4 strokes Intake, Compression, Power, and Exhaust. Now the cam only turns once per the crank twice.
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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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