What is the function of the capacitor in a magneto ignition system?

What is the function of the capacitor in a magneto ignition system?

• A. The capacitor reduces energy loss in the ignition coil.
• B. The capacitor provides an extra spark.
• C. The capacitor stores ignition energy.
• D. The capacitor minimizes arcing at the breaker points, and speeds up the collapse of the primary current.

Answer: (D)

A magneto’s capacitor across the breaker points acts as a snubber. When the points are closed, the capacitor charges slowly; when the points open, it provides a brief current path that smooths the interruption of current in the primary winding. This minimizes arcing across the contact points, reducing wear and pitting, and it helps the magnetic field in the primary collapse more quickly. The faster, cleaner collapse boosts the rapid change in flux that drives the high voltage in the secondary and produces a reliable spark. So the capacitor’s main job is to prevent arcing at the points and to speed up the primary current collapse, which is why this option is the best description.

A magneto’s capacitor across the breaker points acts as a snubber. When the points are closed, the capacitor charges slowly; when the points open, it provides a brief current path that smooths the interruption of current in the primary winding. This minimizes arcing across the contact points, reducing wear and pitting, and it helps the magnetic field in the primary collapse more quickly. The faster, cleaner collapse boosts the rapid change in flux that drives the high voltage in the secondary and produces a reliable spark. So the capacitor’s main job is to prevent arcing at the points and to speed up the primary current collapse, which is why this option is the best description.