Longer life: they typically last at least 150,000 miles because of the properties of steel and the continuous lubrication system, which means less maintenance for your vehicle compared to a timing Rubber V Belt.
And the disadvantages include:
Weight: timing chains are heavier than timing belts because of their all steel construction which requires more power from the engine to overcome inertial forces.
More expensive replacement: generally, a timing chain is more expensive to replace because the whole chain system is encased by a timing chain cover and valve cover to contain the lubrication system.
Noise: chains are always louder than belts because of the metal to metal contact.
Timing belts were introduced to increase the efficiency of engines and reduce noise.
It consists of steel wire-reinforced rubber that has cogs that fit in the corresponding grooves of the Automotive V Belts camshaft and timing pulleys.
