BMW Z4 Starter takes electricity from the battery and converts it into the mechanical twist that wakes up the engine. Every single drive starts with a quick turn of the key or tap of the start button. This electric unit uses a solenoid with thick wiring to conduct current from the BMW battery to an armature encircled by field coils or permanent magnets so that the magnetic force spins the armature and drives the Z4 crankshaft. As it turns, a drive gear is driven forward and meshes with the flywheel. An overrunning clutch pulls it free once the engine fires, protecting parts from damage. Over the years, the beloved BMW roadster has seen two main styles of Starter, an early direct drive Starter that was seen on initial BMW builds and a later gear reduction Starter that became common on modern Z4 models. The gear reduction design has the power flowing through small gears to enable a lesser weight motor to provide greater torque and faster spin, while the older design connects the motor shaft directly, making it bulkier and less efficient but mechanically simple. This ensures the Starter remains effective and long lasting. This is why Z4 owners enjoy reliable starts.
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