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ABC

These letters are used to describe the type of piston and cylinder used in some engines.


  • Aluminium piston.
  • Brass cylinder liner.
  • Chrome coating on the surface of the brass cylinder liner.

These engines have an aluminum piston and a chrome or composite coated brass cylinder sleeve which allows them to be more efficient for higher performance. 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.