Running mate Piston (1 and 4) and (2 and 3)
Running Mate Event (Intake and power) (compression and exhaust)
Possible Firing order 1,3,4,2 (Isuzu, Toyota, Mitsubishi)) or 1,2,4,3 (Nissan)
In graphing of individual piston strokes we need to know, the firing order, running mate piston, running mate event, the rotation of the engine, (clockwise or anticlockwise) , the sequence of series of events (ie c-p, e-i) and the crank angle of the engine. For 4 cylinder 180' 4 strokes = 720' or 2 complete revolutions.