|
Hazelton, Kansas | Randy,
Nope.
Visualize a single cylinder. Starting at top dead center, the piston travels farther during the first 90 degrees than it does between 90 and 180 degrees.
It’s an obviously impractical example, but the sake of easy calculations, consider a stroke of 6” and a rod length of 5,” to get a 3-4-5 triangle at 90 degrees. The distance from crank center to wrist pin is 8” at TDC, 4” at 90 degrees, and 2” at BDC. So the piston traveled 4” in the first 90 degrees, and 2” between 90 and 180 degrees.
That unequal movement is the origin of the secondary (2x rpm) forces that cause the 4 cylinder “buzz.”
Regards.
MDS
| |
|
4 cylinder engines and balancers-engine theory
