When I turn on my car, stop at a light, or just have it in park it hovers around 750 rpm (my older car sat at like 1-1.2k rpm). But why? It’s not moving the car or anything. I know some modern cars turn off the engine if it idles for too long but that doesn’t really explain why. Also when I coast on the highway it will idle at even higher rpm’s. I would have expected the automatic transmission to shift down when it’s not applying any acceleration.
Furthermore, do electric engines idle at a rpm? If not does this make electric cars more energy efficient?
In: 126
Kind op counterintuitive, but a car engine runs cleaner and leaner on a bit higher RPM. The combustion simply isn’t as complete at a lower RPM.
It also depends on the weather. If it is cold, before the engine is warm, it will stall if you let the RPM drop.
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