Why do manual cars/motorcycles stall if you don’t give them gas as you let go of the clutch?
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Let’s try a simpler explanation:
Imagine a small ferris wheel that’s powered by a person. This ferris wheel only has one handle attached to it that the person can use to push it. The person powering the wheel always needs to give the wheel enough of a push so it manages to complete a full rotation, so he can reach the handle again the next time.
If he doesn’t give it a strong enough push, the wheel would come to a stop while the handle is still somewhere in the air where he wouldn’t be able to reach it, so it’s effectively stalled. If there’s something slowing down the wheel, the risk of stalling increases.
Engines are quite similar. They can only give the spinning crankshaft a ‘push’ at certain points of the rotation, and releasing the clutch slows down the crankshaft because some energy is transferred to the wheels.
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