Model airplane/heli engines many times come in ringed and ABC versions. The ringed engine has a piston ring to create the piston-cylinder seal that is needed for compression. An ABC engine has no ring. The ABC stands for Aluminum, Brass, Chrome. It means the engine has an aluminum piston that is running inside of a Brass cylinder that is chrome plated. The ABC engine has the potential for more power and requires very little break-in. It is, however, less tolerant of dirt or dust that may be ingested by the engine. It’s a must to Install an air filter.
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