What is the valve clearance of gasoline engine?

Generally speaking, the gap between the intake valve and the exhaust valve of an engine is different. The gap between the intake valve and the exhaust valve is between 0.20 mm and 0.40 mm, and the gap between the exhaust valve and 0.30 mm and 0.50 mm. The reason why the exhaust valve has a large gap is because the exhaust valve is subjected to large heat and deformation during work, so a large gap should be reserved.

In addition, the valve clearance of different engines is also different. Generally, the valve clearance of diesel engine is larger than that of gasoline engine, and that of turbocharged engine is larger than that of naturally aspirated engine.

Extended data:

Precautions:

1. For gasoline engines, SD-SF gasoline engine oil should be selected according to the additional devices and service conditions of the intake and exhaust system; For diesel engines, CB-CD diesel engine oil should be selected according to the mechanical load, and the selection standard should not be lower than the requirements specified by the manufacturer.

2. Most gasoline engines are equipped with PCV valve (crankcase forced ventilation device) to promote engine ventilation, but pollutants in blowby will be deposited around the PCV valve, which may block the valve. If the PCV valve is blocked, the polluted gas will flow back to the air filter and pollute the filter element, which will reduce the filtering ability. If the inhaled mixed gas is too dirty, it will further pollute the crankcase, leading to increased fuel consumption, increased engine wear and even damage the engine.

3. Clean the fuel system regularly: use BG208 (a powerful and efficient fuel system cleaner) to clean the fuel system, and use BG202 regularly to control the generation of carbon deposits, so that the engine can always be kept in the best condition.

Baidu encyclopedia-gasoline engine

Baidu encyclopedia-valve clearance