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I always thought there were 4 strokes but the way Andre explained it there are actually 6 strokes, the intake stroke, combustion stoke, then exhaust stroke. Just need to get clarification on this before I move on. I always thought intake, pulled air in, bdc, closed valves, piston goes up compression and then when it reached almost to the top exhaust valve opens and lets it out,
The 4-strokes are Intake, Compression, Combustion(aka Power), and Exhaust. Remember, there are two revolutions of the crankshaft for each cycle, so:
Piston going down (180 degrees of crankshaft rotation) Intake Stroke
Piston going up (180 deg of crank rotation) Compression Stroke
Piston going down (180 deg) Combustion/Power Stroke
Piston going up (180 deg of crank rotation) Exhaust Stroke.
That is one complete engine cycle.
Technically, there was a "six stroke" engine developed that used a second cylinder that took "high pressure" exhaust gases to apply pressure to the piston on the down stroke and dump it to atmosphere on the up stroke, much like a single acting steam engine.
IIRC, it was one of those weird, still-born experiments to try and improve engine efficiency, rather than for power output.
