autothermic piston

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• autothermic piston — An aluminum piston in which steel or alloy inserts are cast to control expansion of the piston skirt …   Dictionary of automotive terms

• piston — A round or cylindrical plug, which closed at one end and open at the other. It slides up and down in the cylinder. It is attached to the connecting rod and when the fuel charge is fired, will transfer the force of the explosion to the connecting… …   Dictionary of automotive terms