What is the speed of a single-cylinder diesel engine?

[BriannaRose]

Diesel engine speed is usually between 50 and 150 rpm. Here is relevant information: Additional information: If the speed is too low, the engine tends to vibrate; if it's too high, fuel consumption increases. As long as there's no vibration, design engineers prefer to keep it as low as possible for fuel efficiency. During cold starts, low water temperature can cause the idle speed to automatically increase by 50 to 150 rpm. Additional information: Idle speed should not be too high or too low. Too high increases fuel consumption, while too low causes unstable engine idle speed. The minimum idle speed that ensures stable engine operation is considered the optimal idle speed. Typically, automotive diesel engines have an idle speed between 500 and 800 rpm.