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 - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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