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 - Hydraulic Basics - Part 2 - by Curtis Von Fange. In the last entry to this series we gave a brief overview of hydraulic system theory, its basic components and how it works. Now lets take a look at some general maintenance tips that will keep our system operating to its fullest potential. The two biggest enemies to a hydraulic system are dirt and water. Dirt can score the insides of cylinders, spool valves and pumps. Wate
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