Piston Ring End Gap Standards?

[LeNolan]

Piston ring gaps are divided into three types: side gap, end gap, and back gap. Their specific values are as follows: 1. End gap, also known as the opening gap, refers to the clearance between the two ends of the ring when it is installed in the cylinder in a cold state and positioned at top dead center. It is generally 0.25~0.50mm. 2. Side gap, also known as the edge gap, refers to the clearance between the side of the piston ring and the piston ring groove after the ring is installed in the piston. The first ring has a larger gap due to higher operating temperatures, typically 0.04~0.10mm; other rings generally have a gap of 0.03~0.07mm. 3. Back gap refers to the clearance between the inner cylindrical surface of the piston ring and the bottom of the piston ring groove after the ring is installed in the cylinder, generally 0.50~1.00mm.