1. Lean air-fuel mixture: A lean mixture can cause high combustion temperatures, which can erode the valve seats and cause the valve to wear prematurely.
2. Low-quality fuel: Fuel that contains impurities can also cause valve wear. The impurities can act as abrasives and wear away the valve surfaces.
3. Overheating: Overheating can cause the valve seats to warp or erode, which can lead to valve wear.
4. Excessive valve clearance: Excessive valve clearance can cause the valve to flutter, which can lead to wear on the valve and the valve seat.
5. Carbon deposits: Carbon deposits on the valve and valve seat can also cause wear. The carbon deposits can act as abrasives and wear away the valve surfaces.
Exhaust valves do not wear as much as intake valves because they are subjected to lower temperatures. The exhaust gases are cooled by the exhaust system before they reach the valve, so the valve is not exposed to the same high temperatures as the intake valve. Additionally, the exhaust valve is made of a different material than the intake valve, which is designed to withstand higher temperatures.
