![]() An insufficiently tense timing belt increases the chances of it pinging off. ![]() Timing belts function best when the magnitude of slack side tension is about 10% to 30% that of the effective tension. A higher twist shows the belt is loose, while a lesser twist means it’s too tight. The required measure of tension in a serpentine belt is it shouldn’t deflect over 0.5 inches when twisted either way from the middle. Remember that the serpentine belt envelops several pulleys while a timing belt connects only two. The timing belt is shorter than a serpentine belt. This belt plays a critical role in the combustion process of your vehicle.Ī timing belt is directly driven because it’s directly connected to the crankshaft pulley and turns the camshaft. The timing belt connects the crankshaft to the engine valves, which supply fuel and air. Its role is to rotate, turn, or drive all pulleys connected to it. The force it generates depends on the friction between the belt and pulley surfaces it runs. The belt powers many components, and they move because the belt does.įurther, the serpentine belt is friction-oriented or friction driven. FunctionalityĪ serpentine belt connects to your alternator, power steering pump, water pump, and other accessories. Most vehicles have the timing belt encased in a steel casing, making it difficult to replace. It’s directly connected to your engine via the crankshaft. It’s the long rubber band stretched out on the side of your car once you pop the hood. The serpentine belt is outside the engine. Not more than 0.5 inches deflection when twisted in the middle Turns the camshaft(s) which open and close the valves Runs power accessories bolted to the engine Below is a table outlining the main differences. There are several differences between a serpentine belt and a timing belt. Differences Between a Timing Belt and a Serpentine Belt Design improvements and a long lifespan are fueling the return of timing chains in many modern cars. Timing belts were introduced in the 1960s because they are quieter and lighter. Timing chains function the same as the belt, but they have metal instead of rubber. Depending on your vehicle model, you may have a timing chain instead of a timing belt. The timing belt is a rubber belt with hard teeth for interlocking with the crankshaft and camshaft cogwheels. The serpentine belts get their name from their appearance and how they weave themselves in and out of various accessories and pulleys with ease. The belt’s ribbed side is in contact with grooves on accessory drive pulleys, while the flat side is in contact with a tensioner roller. These ribs make it more flexible, which allows the belt to move and wrap around smaller accessories in the engine. Serpentine Belt DefinitionĪ serpentine belt is a V-ribbed belt and ribbed on one side. To understand the roles, let’s look at their definitions. The serpentine belt and timing belt perform crucial functions in the performance of your vehicle. What Exactly Does a Serpentine Belt Do?.Differences Between a Timing Belt and a Serpentine Belt.
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