An even firing 2 cylinder, 4 stroke engine has both pistons moving up and down in unison. Even with counterbalancing this causes a powerful vibration in the plane of the cylinders. So while the power impulses are smoother, the engine will vibrate heavily. (If you ever spot an IH Titan or Mogul - 2 cylinder, even firing - tractor running look at it closely. You will notice the entire machine literally shakes forward and back a good 1/4" in time with the flywheel when idling.)
Now by arranging the crank pins 180 apart, the pistons now always travel in opposite directions. This cancels good portion of the vibration caused by the pistons/rods. The tradeoff of course is uneven firing impulses.
In the case of a John Deere tractor these uneven impulses are smoothed somewhat by using a very heavy flywheel.
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Today's Featured Article - Threshin Demonstration - by Michael Delaney. Introduction I bring you greetings from Prince Edward Island, Canada. We are Canada�s smallest province but big on farming. Maybe you�ve heard of us. Potatoes are our biggest crop. However, there is lots of mixed farming here also. I have a small mixed farm with 25-30 cattle. I make very good use of old machinery. I have a 135 MF Diesel, Farmall H and 1/3 share in an Allis B. I have complete lines of tillage and harvest equipment, and a saw gear etc. I have everything one would
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