1: What is Maximum Power?
Maximum power often reflects the top speed of a car and is used to describe the vehicle's performance.
2: Misconceptions about Maximum Power
The magnitude of maximum power primarily depends on the engine's displacement, the amount of fuel combustion, and the engine's rotational speed. The power value is always associated with the engine's rotational speed, indicating the power produced at that specific speed. The actual effective power is always lower than the specified value due to internal friction losses within the engine and power consumed by driving other machinery.
The output power of an engine is greatly influenced by its rotational speed. As the speed increases, the engine's power also increases accordingly. However, after reaching a certain speed, the power tends to decrease. The maximum output power of a car is typically expressed in revolutions per minute (rpm) in the vehicle's user manual, such as 100 horsepower at 5000 rpm. The corresponding rotational speed of the engine's maximum power is usually its maximum speed. The maximum power speed of a sedan or passenger car engine is higher than that of a commercial vehicle, in order to meet the requirements of high-speed driving.
3: How to Improve Maximum Power
Firstly, increasing the intake volume can be achieved by optimizing and enlarging the intake and exhaust passages, increasing the cross-sectional area of the engine valves, raising the compression ratio, and modifying the valve opening and closing timings. Secondly, technical adjustments can be made to the intake and exhaust systems, and even the replacement of the compression system can be considered.
All these measures aimed at increasing power will result in an overall increase in engine speed. Therefore, advanced materials must be used to lighten the moving parts while improving machining precision to withstand higher loads. It is also necessary to use more robust valve springs and even non-contact ignition systems. Through this series of modifications, the power output of mass-produced engines can potentially increase by more than double.
