Why is the valve clearance of the exhaust valve larger than that of the intake valve?

1 Answers
ReedFitz
07/29/25 9:59pm
This is because a larger exhaust valve clearance allows for better expulsion of combustion exhaust gases, hence it needs to be larger than the intake valve clearance. The specific reasons are as follows: 1. Reason: The intake process relies on vacuum suction, while the exhaust process involves pushing out gases through compression. Additionally, to allow more fresh air into the engine, thereby enhancing the vehicle's power performance, naturally more intake is required. Therefore, the intake valve must be made larger, whereas the exhaust valve does not have this requirement. 2. Consequence: If the intake valve clearance is larger than the exhaust valve clearance, no matter how much air is taken in, it will be ineffective because the exhaust gases are not maximally expelled. This significantly affects combustion efficiency, leading to symptoms such as insufficient power and increased fuel consumption.
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