Why don't Volkswagen cars use timing chains?

[LaPaige]

Volkswagen cars do not use timing chains because timing chains have disadvantages. As they gradually stretch with use, they can produce noise, unlike timing belts which are more convenient to replace every 100,000 kilometers or so, and are also cost-effective. Additionally, the engine does not suffer from excessive noise as a result. The functions of the timing belt and water pump drive are as follows: Function of the timing belt: The main function of the engine timing belt is to drive the valve train of the engine, ensuring that the intake and exhaust valves open or close at the appropriate times to allow the engine cylinders to intake and exhaust normally. Function of the water pump drive: In some models, such as the Volkswagen Jetta (fuel-injected), Santana 2000, Bora, Audi, etc., the timing belt also takes on the task of driving the water pump.