The maximum cylinder taper normally allowed is up to how many inches?

The maximum cylinder taper normally allowed is up to how many inches?

• A. 0.04 inch
• B. 0.02 inch
• C. 0.06 inch
• D. 0.08 inch

Answer: (C)

Maximum cylinder taper is the difference between the bore at the top and the bore at the bottom of a cylinder. This taper matters because as the piston moves, the rings need a consistent seal along the bore; too much taper lets the ring land become uneven, reducing compression and increasing oil consumption. The normally allowed limit is 0.06 inch. If you measure more taper than that, the bore is considered out of spec and you’d typically re-bore to an oversize size and fit corresponding pistons, or repair the block another way. The smaller values would be unnecessarily strict for a normal rebuild, while the larger value would permit too much wear and likely cause sealing and performance problems.

Maximum cylinder taper is the difference between the bore at the top and the bore at the bottom of a cylinder. This taper matters because as the piston moves, the rings need a consistent seal along the bore; too much taper lets the ring land become uneven, reducing compression and increasing oil consumption.

The normally allowed limit is 0.06 inch. If you measure more taper than that, the bore is considered out of spec and you’d typically re-bore to an oversize size and fit corresponding pistons, or repair the block another way. The smaller values would be unnecessarily strict for a normal rebuild, while the larger value would permit too much wear and likely cause sealing and performance problems.