How does the starter work in your car?
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Back in the old days, cars had a hand-operated crank that had to be spun around for quite a while by the driver in order to start an engine. The reason for this was simple. In order to start a combustion engine, there are three things that need to happen.
The engine must have fuel/air mixture flowing inside the combustion chamber Spark must be engaged to ignite the fuel Compression must be achieved inside the motor
The hand held starter was connected to the crankshaft, which controlled fuel flow, powered the coil to produce spark, and controlled the piston rods to move up and down to create compression. Believe it or not, today’s electric starters accomplish the exact same task of the hand held device, except they take away the manual labor and make life much easier for drivers to start their cars, trucks, or SUVs.
Today’s electric operated starters are connected to the side of the motor. They are powered by an electrical signal that is sent from the battery to a solenoid that sends an electrical current to a starter motor. As the starter motor receives electric power to engage, it engages an input shaft to push a series of metal gears against the engine’s flywheel (which is connected to the crankshaft). As the motor begins to spin, the flywheel is turned, which activates the starting procedure utilized today.
The starter motor is controlled by an ignition switch. When the driver presses the ignition button or turns the key to the start position, the starter motor spins. When the ignition switch is moved back to the run position, the starter motor stops spinning. The activation of the ignition switch also activates the fuel and electrical portion of the engine. The starter motor simply spins the motor over to produce the compression needed to ignite a cylinder.
The starter itself has multiple components that must work together in order to operate efficiently and start the vehicle’s engine. When any of these individual parts fail, the entire starter is typically rendered useless and must be repaired or replaced by a certified mechanic. Most starters last about 100,000 miles on most domestic and foreign vehicles. When they fail it is usually due to an electrical component failure such as the starter solenoid or damage inside the starter motor.
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