The single most important factor to be considered in selecting the proper compression (top) ring face coating material is the service requirements the engine will be operated under. Will the engine be subjected to unusual speed or load (high temp conditions), stop and go short trip driving, occasional or regular strip use, or in a high dust or dirt environment?

The three popular types of compression ring face coatings are cast iron, moly, and chrome. Each has advantages of its own with...
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