Timing Belts Vs. Timing Chains

by Michael Ryan

Timing belts and timing chains control the timing of the values in an internal combustion engine. Without this synchronization, an engine would be difficult to start and impossible to keep running.

Function

Both belts and chains connect the crankshaft to the camshaft, which is ultimately charged with timing the valves. The valves may be set up in a freewheeling setup, in which there is enough clearance between the valves and pistons to avoid contact if timing is out of sync, or an interference configuration, where engine damage will occur if the timing is interrupted.

Benefits

Timing belts are less expensive than chains, but they are wear items that must be replaced. Timing chains are normally good for the life of a vehicle, but they are more expensive to design and install if service is needed.

History

During the 1970s and 1980s, many manufacturers started using timing belts, because of their lower cost and quieter operation. However, timing chains are once again popular and used on many North American and European models.

Considerations

Although a timing belt and timing chain are not interchangeable, you should consider which setup a vehicle has before making a purchase. Timing belts require regular service and must be changed between 60,000 and 100,000 mile intervals. Regular oil changes are all that is needed to maintain a timing chain.

Warning

Some engines driven by both timing belts and chain have interference setups, where advancing or retarding the timing will effectively destroy the engine. If your manufacturer recommends scheduled inspections or timing belt service, do not avoid getting the work done, as it could cost thousands of dollars to fix the resulting damage.

About the Author

Michael Ryan is a freelance writer with professional experiences in the auto industry and academic training in music. Ryan earned a Bachelor of Arts with honors from Olivet College. Since college, he has been a featured speaker at music conferences at the University of Michigan and Bowling Green State University. Ryan is a published writer, with work featured on websites including eHow and CarsDirect.com.

Photo Credits

  • photo_camera NA/Photos.com/Getty Images