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 - Oliver 550 Clutch Overhaul Tips - by Greg Sheppard. I got my 1964 Oliver Model 550 (serial 141-139-519) second-hand and used it for several years before the clutch began to slip. After taking up the pedal linkage several times I saw it was going to take more than that. The engine had been leaking oil at the rear seal and I suspected
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