What is the engine speed at 50 km/h?
2 Answers
Engine speed is around 1200 rpm. Normal engine speed range: Normally it is 700-800 rpm. If it is too low, the engine tends to shake, and if it is too high, fuel consumption increases. As long as there is no shaking, design engineers prefer to keep it as low as possible to save fuel. Engine speed: The operating condition of an engine at its rated power and rated speed is called the rated condition. The rated power is not the maximum power the engine can produce; it is the maximum usable limit of effective power set according to the engine's purpose. For the same engine model, the rated power value varies depending on its application. Effective torque also changes with engine conditions. Therefore, the maximum torque a car engine can output and its corresponding speed are used as an indicator to evaluate the engine's power performance.
I've been driving manual transmission cars for many years. At 50 km/h, the engine speed isn't fixed—it depends on the gear you're in. If I'm in 3rd gear, the engine might rev up to around 2500 RPM, making a buzzing noise that's a bit loud, but the acceleration is decent. Shift up to 5th gear, and the RPM drops, possibly below 1500, making it quiet and fuel-efficient, perfect for city commuting. From my experience, too high RPMs waste fuel and shorten engine life, while too low RPMs result in insufficient power, making uphill climbs tough. Why care about this? Don’t ignore the tachometer or the engine sound while driving. Like me, getting used to paying attention to these details can significantly extend your car's lifespan. Different cars vary greatly—smaller engines naturally run at higher RPMs. A 1.5L engine in 4th gear often runs at over 2000 RPM. In short, experimenting with shifting up and down is quite helpful for new drivers learning to drive.
