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Piston Ring Handbook
Joint Notches

Piston ring joint notches are designed to prevent ring rotation in two-stroke engines. This ensures that the ring ends do not spring into the cylinder scavenging ports and break. Occasionally the ring gap is also fixed in position in the second groove in horizontal-cylinder 4-stroke engines.
The ring is arrested by means of a pin which is secured in the piston groove and engages into the additional recesses at the ring ends. With the internal and central notch the pin is located in the piston groove root and with the side notch it is in either the top or bottom side of the groove.
Of the three systems described, the internal notch is the most commonly used.

Joint with Internal Notch
Joint with Central Notch
Joint with Side Notch


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