What is taper and ovality in the bore, how is it caused how do you check it?
Taper and ovality are used to describe the conditions of the cylinder bore.
Ovality is the difference between a and b
Taper is the difference between the large diameter at the first measurement and the smallest diameter at the 3rd measurement.
to check the taper you need to take a measurement at the top of the cylinder 90 degrees from the wristpin direction, then one at the bottom of the piston travel in the cylinder. then subtract the smaller number from the larger and you've got your Out of round measurement.
Ovality on the other hand requires a minimum of 4 measurements. One across the top of the cylinder parallel to the wrist pin direction(when installed), then one at the top perpendicular to the wrist pin direction(when installed), then repeat for the lower section of the cylinder. Take the larger number and subtract the smaller number and you have your "out of round" measurement on ovality. Repeat for the lower section. It's more common practice to do 6 measurements top, center, lower
Taper and ovality are used to describe the conditions of the cylinder bore.
Ovality is the difference between a and b
Taper is the difference between the large diameter at the first measurement and the smallest diameter at the 3rd measurement.
to check the taper you need to take a measurement at the top of the cylinder 90 degrees from the wristpin direction, then one at the bottom of the piston travel in the cylinder. then subtract the smaller number from the larger and you've got your Out of round measurement.
Ovality on the other hand requires a minimum of 4 measurements. One across the top of the cylinder parallel to the wrist pin direction(when installed), then one at the top perpendicular to the wrist pin direction(when installed), then repeat for the lower section of the cylinder. Take the larger number and subtract the smaller number and you have your "out of round" measurement on ovality. Repeat for the lower section. It's more common practice to do 6 measurements top, center, lower
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