What will happen if the car engine is accidentally rekindled after starting?

Generally speaking, there are two aspects:

1 has a certain influence on the teeth of the gear and flywheel of the starting motor, which is simply broken teeth.

2. The transmission ratio between flywheel teeth and unidirectional teeth is very large. After the engine starts, the starter starts again. Because of the great difference between the rotating speed of the flywheel teeth and the rotating speed of the unidirectional teeth, the unidirectional teeth cannot be coupled with the flywheel teeth, and the edge of the unidirectional teeth will rub against the edge of the flywheel teeth, resulting in a very harsh sound. The final result is that the flywheel teeth and unidirectional teeth are seriously worn, which will lead to gear damage.

Extended data:

Automobile engine is the machine that provides power for automobile, and it is the heart of automobile, which affects the power, economy and environmental protection of automobile. According to different power sources, automobile engines can be divided into diesel engine, gasoline engine, electric vehicle motor and hybrid power.

Common gasoline engines and diesel engines belong to reciprocating piston internal combustion engines, which convert the chemical energy of fuel into mechanical energy of piston movement and output power to the outside world. Gasoline engine has the advantages of high speed, low quality, low noise, easy start and low manufacturing cost. Diesel engine has high compression ratio and high thermal efficiency, and has better economic performance and emission performance than gasoline engine.

In addition to gasoline and diesel, vehicles using other new energy sources are called new energy vehicles, including pure electric vehicles, hybrid vehicles, fuel cell vehicles, gas vehicles, bioethanol/biodiesel vehicles and hydrogen-powered vehicles. Most of the new energy vehicles on sale in China market are hybrid vehicles, but at present, pure electric vehicles have been taken as the main direction.

Reference Link-Baidu Encyclopedia-Automobile Engine