Correctly understanding the quality of the number of valves in a car
Jul 29,2025
The statement that the more valves a car has, the more fuel-efficient it is is is incorrect. Increasing the number of valves will only increase the engine's power performance. Traditional engines typically have one intake valve and one exhaust valve per cylinder. This type of two valve valve mechanism is relatively simple and has low manufacturing costs. For ordinary engines with low output power requirements, it can achieve satisfactory engine output power and torque performance. Engines with larger displacement and power require the use of multi valve technology. The simplest multi valve technology is a three valve structure, which adds an intake valve to the two valve structure of one intake and one row.
In recent years, most of the newly developed sedans by major automobile companies around the world adopt a four valve structure. In a four valve valve train, each cylinder has two intake valves and two exhaust valves. The four valve structure can significantly improve the intake and exhaust efficiency of the engine, and most new sedans adopt four valve technology. VVT variable valve technology, TSI cylinder direct injection+turbocharging technology, multi-stage gears, many of them are fuel-efficient technologies. The number of valves in a car mainly depends on the difference in intake and exhaust volume. If the torque is adjusted to low speed and high torque output, the 8-valve start is relatively faster and more fuel-efficient. Personally, I feel that the 88 valve is fuel-efficient on city roads, and the 8-valve does not consume much fuel.
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