Tim Psensky wrote :
>
> Don't forget, these engines are 4 stroke machines (the
> crank makes two full revoltions for each cylinder to
> fire once.)
Which is where the 120 degrees comes from. 720 degrees (2x360) to complete
a full cycle, divided by 6 cylinders, gives a firing every 120 crank degrees
(for an "even fire" engine)
> on a four cylinder engine, all the journals are in the same plane.
Yes, assuming it's a 4-stroke. 720 degrees divided by 4 is 180 ...
But, a 4-cyl 2-stroke has 2 planes : 360/4 = 90
> A water wheel would be akin to a two stroke engine (each cylinder fires
> once each revolution.)
Right, with a few other minor differences <g>
Randall
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