What does maximum power speed mean?
2 Answers
Engine output power is closely related to rotational speed. As the speed increases, the engine's power also increases accordingly, but after reaching a certain speed, the power tends to decline. Therefore, the rotational speed at which the engine reaches its maximum power is called the maximum power speed. In automotive manuals, the unit of rotational speed is usually expressed in r/min. For example, a maximum power of 100Ps/5000r/min means the highest output power of 100Ps is achieved at 5000 revolutions per minute. Here is some relevant information about engine power: 1. Engine output power is closely related to rotational speed: As the speed increases, the engine's power also increases accordingly, but after reaching a certain speed, the power tends to decline. In automotive manuals, the highest output power is usually expressed in revolutions per minute (r/min), such as 100HP/5000r/min, meaning the highest output power of 100 horsepower is achieved at 5000 revolutions per minute. 2. The rotational speed corresponding to the engine's maximum power is basically the engine's maximum speed: The rotational speed at maximum power for passenger car or bus engines is higher than that of trucks to meet the needs of high-speed driving. When the engine's maximum power decreases by more than 25% compared to the standard, a major overhaul should be performed.
Maximum power RPM simply means how fast the engine spins when it delivers its peak horsepower. From my driving experience, this figure usually hovers around 5,000 RPM, with significant variations across different models. Take highway driving for example—you need to rev the engine up to this point when overtaking to really feel the car's power. However, it's rarely used during daily commutes or grocery runs, as higher RPMs mean worse fuel efficiency, louder noise, and increased engine wear concerns. I believe this parameter matters when choosing a car: sportier models tend to have higher maximum power RPM, while family cars strike a balance, helping you understand the performance ceiling. Remember, maximum torque RPM is different—it's when the engine feels strongest. Combining knowledge of both maximum power and torque RPM makes for smoother driving. In short, understanding this helps optimize acceleration.
