What is the engine output power?
2 Answers
"Output power" in academic literature refers to: For other electrical appliances, the nominal power, also known as the nominal output power, is the maximum value of output power that the appliance can maintain for a long time without distortion, while the maximum power refers to the instantaneous power maximum without damaging the appliance, which is the maximum load capacity the appliance can withstand. Output power = Input power - Power of useless work. Symbol: P Common unit: W (Watt) The engine's power is not equal to the car's power. In mechanical transmission, there will be intermediate power loss. Additionally, designs that thicken and increase the weight of the car body for safety reasons can also lead to engine power loss. Therefore, cars with small-displacement engines are not necessarily slower or perform worse than those with high-power engines. Maximum output power is generally expressed in horsepower (ps) or kilowatts (kw). The engine's output power is closely related to the speed. As the speed increases, the engine's power also increases accordingly, but after reaching a certain speed, the power tends to decline. Generally, the maximum output power in car manuals is expressed in revolutions per minute (r/min), such as 100ps/5000r/min, meaning the maximum output power is 100 horsepower at 5000 revolutions per minute. Methods to improve engine power: Improvement of thermal efficiency; Improvement of charging efficiency; High-speed optimization; Improvement of mechanical efficiency. Daily engine maintenance can be performed using the following methods: Use lubricating oil of appropriate quality grade. For gasoline engines, choose SD--SF grade gasoline engine oil based on the additional devices of the intake and exhaust systems and usage conditions; for diesel engines, choose CB--CD grade diesel engine oil based on mechanical load, with the selection standard not lower than the manufacturer's requirements; Regularly change the oil and filter. The quality of any grade of lubricating oil will change during use. After a certain mileage, the performance deteriorates, causing various problems for the engine. To avoid failures, change the oil regularly according to usage conditions and keep the oil volume moderate; When oil passes through the fine holes of the filter, solid particles and viscous substances in the oil accumulate in the filter. If the filter is blocked and oil cannot pass through the filter element, the filter element may burst or the safety valve may open, allowing oil to pass through the bypass valve and bring dirt back to the lubrication area, accelerating engine wear and increasing internal pollution; Regularly clean the crankcase. During engine operation, high-pressure unburned gas, acid, water, sulfur, and nitrogen oxides in the combustion chamber enter the crankcase through the gap between the piston ring and the cylinder wall, mixing with metal powder from part wear to form sludge. When the amount is small, it suspends in the oil; when large, it precipitates from the oil, blocking the filter and oil holes, making engine lubrication difficult and causing wear; Regularly use a radiator cleaner to clean the radiator. Removing rust and scale not only ensures the engine works properly but also extends the overall lifespan of the radiator and engine.
Engine output power refers to the amount of power it can generate at maximum RPM, usually expressed in horsepower or kilowatts. For example, 100 horsepower indicates the car can provide decent acceleration. Having driven many cars, I find that higher-powered engines offer quicker starts and smoother overtaking, which is noticeably beneficial in daily driving, especially on elevated roads where the car feels more stable. However, power isn't constant—my previous older car maintained its original horsepower with good maintenance, but if cooling was poor or carbon buildup severe, power could drop by 10% or more. When buying a car, I pay attention to this—new cars list standard power in the manual, with mainstream family sedans around 150 horsepower. Electric vehicles, due to their motors' fast response, may have even higher figures. This data helps in choosing a car with ample power.
