Saturday, October 26, 2013
Steels Used in Piston Rings
The piston ring is a seal between the piston and the cylinder designed to prevent gas leakage around the piston. Piston ring material must withstand high temperature and friction to function properly. Engine technology has changed over time and so has piston ring material.
Cast Iron
Cast iron piston rings are good choices for engines. The material is compatible with the sides of a cast iron block so it wont gall. With newer high-performance engines, it isnt as good of a choice. Cast iron is heavy and somewhat brittle. It requires a thicker ring to handle engine loads.
Steel
Modern engines use steel piston rings. Steel is thinner and can withstand higher pressures and heat that modern engines produce. Because they are thinner, lighter and stronger, steel is a better choice for higher performance engines.
Coatings
To further improve wear and reduce friction and corrosion, it is possible to coat steel piston rings with chrome or other materials. Steel rings accept coatings easier than iron rings.
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