04-13-2013, 08:28 PM
It has two journals with a counter weight between them. With the pistons in phase you get a power stroke every 360 degrees of rotation. A later version had the pistons 180 degree out of phase to reduce vibration, but with that arrangement you get a power stroke at 540 and 180 degrees.
Free advice is worth exactly what you payed for it.
Greg
Greg