What is the normal cranking speed of the engine?

The normal cranking speed of an engine, particularly during the starting process, typically ranges around 200 RPM. This speed is sufficient for the engine to initiate the combustion cycle and produce the necessary power to start. At this cranking speed, the engine can effectively generate enough air-fuel mixture intake and compression to enable ignition.

In contrast, the higher RPM options are more representative of an engine running at idle or during normal operation rather than cranking. For instance, 1000 RPM is often seen during idle, where the engine runs smoothly and continues operations. 1500 and 2000 RPM would be relevant for higher levels of engine function or acceleration but not during the cranking phase. Therefore, recognizing that 200 RPM is traditionally utilized for cranking illustrates the specific requirements and operational characteristics of engine start-up dynamics.