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Rotor Arms

If you're not particularly au-fait with engines, you might not be familiar with what a rotor arm is, but without it your car wouldn't even start.

The rotor arm sits inside the distributor cap and is driven by a gear which turns the arm, with the metal ends making contact with high voltage cable from the ignition coil as it turns.

This then sparks each individual spark plug in turn, giving the ignition required for the internal combustion engine to work.

Brain melted? Don't worry - leave it to our expert in store colleagues to worry about all that, leaving you to worry about where your next journey will take you.