Model Engine Company of America
Ringed Engines
There are two basic ring types, DYKE'S and CONVENTIONAL
A DYKE'S type ring is a "L" shaped ring that fits at the very top edge of the piston. Many people can not even see it as there is no piston material above it. Dyke's rings do not feel like they are working (no compression) when the engine is turned over by hand. A dyke's type ring is pressure activated, (it is like a dyke) when pressure pushes against the inner side of the ring it is pushed out tightly to the cylinder wall. When it is running past the ports no pressure is pushing it so there is less friction. This is why dyke's rings produce more power than conventional type rings.
A conventional ring is just that. It has a rectangular profile and fits into a groove usually about a 1/16" down from the top of the piston. Conventional rings, when broken in properly, provide a good seal at any speed. Conventional rings have constant tension that force them against the cylinder. When you flip a good conventional ringed engine over it feels great with snappy compression.
Ringed engines must be broken in properly. Click here to learn how.
The above information is provided as a guide. Since MECOA/K&B has no way of determining the ability of the individual using and understanding this information, we assume absolutely NO RESPONSIBILITY for any damage to person or property from the use of this information.

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