eli5 What’s happening when an engine stalls from low RPM?

Question

eli5 What’s happening when an engine stalls from low RPM?

In: 21

Answer 1

It doesn’t stall from low RPM, it is stalled therefore the RPM falls.

There are probably two basic reasons

a) Fuel/air issues. So if there is insufficient air or fuel entering the engine, it will stall.

b) Loading. For a given amount of fuel/air and engine RPM, the engine can only output a certain amount of torque to the crankshaft. If the load on that shaft is more than the engine can produce, it will stall the engine.