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Frequency, 30

Calculate the RPM of a 4 cylinder engine waveform by multiplying the ___ of the compression strokes by ___

720, Twice, 2

There is ___ degrees between the a cylinders power strokes. This shows that for every full cycle of combustion the engine rotates ___. So there are ___ engine revolutions per power strokes of cylinder 1.

Second, 360, 300

If the starter current draw ramps (compression stroke) have a frequency of 10Hz, this is equal to 10 strokes per ___. Since 2 strokes occur in ___ degrees, means 10 strokes is actually 5 revolutions per second. Multiply this by 60 to convert to minutes gives us ___ RPM.

60, Half, Cylinders

RPM = Freq(Strokes) x ___ / n where n= ___ the count of ___

8, 4

If it was an ___ cylinder engine then ___ strokes would be 360 degrees so RPM = Freq(Strokes) x 15

5, 2.5

If it was a ___ cylinder engine then ___ strokes would be 360 degrees so RPM = Freq(Strokes) x 24