To find the amount of bore taper, which calculation should be performed?

To find the amount of bore taper, the correct calculation involves measuring the diameter of the bore at two different positions: the top and the bottom of the cylinder. Typically, these measurements are designated as measurement "C" for the top of the bore and measurement "D" for the bottom of the bore. By subtracting measurement "C" from measurement "D," you can determine the difference in diameter between the two points, which indicates the extent of the taper.

Bore taper can lead to various engine problems, including uneven wear on piston rings and improper sealing, so accurately measuring it is vital for engine performance. Using the measurements from the top and bottom of the bore allows the technician to evaluate how much the bore has changed from one end to the other, providing essential information for diagnosing engine health and addressing any necessary repairs.