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 - A Belt Pulley? Really Doing Something? - by Chris Pratt. Belt Pulleys! Most of us conjure up a picture of a massive thresher with a wide belt lazily arching to a tractor 35 feet away throwing a cloud of dust, straw and grain, and while nostalgic, not too practical a method of using our tractors. While this may have been the bread and butter of the belt work in the past (since this is what made the money on many farms), the smaller tasks may have been and still can be its real claim to fame. The thresher would bring in the harvest (and income) once a y
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