As the flywheel slows down, the voltage supplied to the ignition coil decreases, causing the spark plugs to stop producing sparks. This eventually leads to the engine stalling and stopping completely. The amount of time the engine runs after turning off the ignition depends on the vehicle's design and the flywheel's inertia. It's generally just a few seconds, but in some cases, it can be longer.
Here's a detailed explanation of what happens when you turn off the ignition:
1. Ignition switch turns off: When the ignition key is turned off, it cuts off the power supply to the ignition system, including the ignition coil.
2. Flywheel keeps spinning: The flywheel, due to its inertia, continues to rotate even after the ignition is switched off.
3. Engine keeps running: The spinning flywheel keeps the crankshaft and pistons moving, allowing the engine to continue its power cycle.
4. Fuel flow stops: However, since the ignition is off, the fuel injector stops supplying fuel to the cylinders.
5. Spark plugs stop firing: Without fuel and spark, the engine's combustion process can no longer occur.
6. Engine slows and stalls: As the flywheel slows down, the crankshaft and piston movements lose momentum, causing the engine speed to decrease. Eventually, the remaining energy in the flywheel is exhausted, and the engine comes to a stop.
It's worth noting that some modern vehicles use a different system called "electronic fuel injection," where the fuel supply is electronically controlled. In these vehicles, turning off the ignition also immediately stops fuel injection, leading to a quicker engine stall.
