Piston Ring: A ring inset into the piston of an engine intended to preserve a gas-tight seal between the piston and the cylinder wall.
Ringed An engine which uses a piston with a piston ring. Compare to ABC or ABN.
They have no piston ring and rely on a very tight piston/cylinder fit to obtain a piston/cylinder seal. New ABC engines are normally hard to turn over by hand. Because of the tight fit, it is very important that the engine is broken in properly.
Worn piston rings, scored or worn cylinder walls, blown head gaskets, or sticking or burnt valves, are potential culprits.
 See also: Speed, Aircraft, Flight, Pilot, Power
  
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