What is the piston ring end gap?

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The piston ring end gap refers to the distance between the ends of a piston ring when it is installed squarely in the cylinder. This gap is critical because it ensures that the piston ring can expand freely with heat and will not bind. It also helps to maintain proper sealing between the combustion chamber and the crankcase.

Having the correct end gap is important for optimal engine performance. If the gap is too small, the ring may expand excessively when heated, leading to potential damage and failure. Conversely, if the gap is too large, the sealing ability of the ring may be compromised, allowing blow-by, which decreases engine efficiency and performance. Therefore, measuring and setting the correct piston ring end gap is an essential part of engine assembly and maintenance.

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