Yes the piston travels a farther distance in the first and last quarter of crank rotation as compared to the second and third quarter of crank rotation. This is due to the side movement of the connecting rod. Picture a ladder leaning against your house. If you pull he bottom of the ladder away from the house the top of the ladder moves down yet the bottom of the ladder is still at ground level. In the first quarter of Crankshaft rotation it's pulling the piston down plus moving the bottom end of the rod away (from the house sort of speak) so there are two elements causing the piston to come down. In the second quarter of crankshaft rotation the crank is still pulling the piston downward but it's moving the rod (closer to the house) decreasing overall downward piston travel. Third quarter of crank rotation it's pushing the piston up but pulling the rod away from the house again, the fourth quarter of crank rotation the piston is going up and the rod is moved closer to the house.
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Today's Featured Article - Product Review: Black Tire Paint - by Staff. I have been fortunate in that two of my tractors have had rear tires that were in great shape when I bought the tractor. My model "H" even had the old style fronts with plenty of tread. My "L" fronts were mismatched Sears Guardsman snow tires, which I promptly tossed. Well, although these tires were in good shape as far as tread was concerned, they looked real sad. All were flat, but new tubes fixed that. In addition to years and years of scuffing and fading, they had paint splattered on
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