Join Date: Sep 2010
Location: Gosford Australia
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To add further confusion,
In four strokes each crankshaft journal does 720 degrees rotation to fire once. The balance of the motor is worked out on eveness of firing position depending on the number of cylinders and piston speeds.
Pistons actually slow and come to a complete stop at top and bottom dead centers, this means some pistons are stopped whilst others are at maximum velocity, not the best thing for perfect balance, or minimum stress on the motor.
Think of it this way, a 2 cylinder motor goes bang, bang, pause, bang, bang, pause etc etc
Now lets hear from an expert.