Timing Belt vs. Timing Chain

You probably know that some engines use timing belts, while some use timing chains. You probably also know that both timing belts and timing chains serve the same purpose--which is to synchronize the rotation of the crankshaft and camshaft so that combustion occur at exact intervals. So why do car manufacturers choose one or the other when making their engines? Let's find out the actual difference between a timing chain and timing belt to discover why one would be a better option than the other, functionality-wise.

Timing belts

©istockphoto

Timing belts are usually made of a composite material that uses high quality rubber and other strengthening materials such as fiberglass. Before timing belts were introduced mid-1960s, virtually every four-stroke engine used a timing chain, which tend to be noisy. Belts on the other hand, are very quiet. They are quite dependable, but they can’t match the chain in terms of lifespan and heavy-duty durability. Most automobile manufacturers will recommend a timing belt to be replaced every 80,000 to 100,000 kms or every five years, whichever comes first.

It is often recommended that you replace your water pump along with the timing belt. That's because both belt and pump are usually the same age, and generally wear out around the same time.

Timing chains

©istockphoto

Timing chains look like the chain you see turning the spokes of a bicycle. They are made up of small pieces of metal joined together, and due to the nature of their construction, timing belts tend to be very noisy. Some auto manufacturers suggest replacing it at certain intervals, but others are confident enough to state that their chain will last the life of the car.

Timing chains are heavily reliant on the engine's oil pressure. If the oil pressure constantly goes beyond or over recommended levels, this can impact the effectiveness of the chain, which could negatively affect the engine timings.

Also, a broken timing chain usually causes a lot more damage than a broken belt. Not that a broken belts don't deal any harm, but these are usually minimal, especially when compared to the level of destruction left behind when a timing chain breaks.

Conclusion

As you can see, each timing material has its pros and cons. If you value quietness and don't mind spending for your maintenance intervals, then a vehicle with a timing belt is the option for you. But if you prefer a lesser maintenance approach, you're probably better off with a timing chain-equipped vehicle.

 

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