Ignition System

Throttle controlled switch is located in vacuum line between intake manifold banjo connection and distributor vacuum retard unit. A throttle operated cam governs switch position progressively from open to closed. In the open position (switch plunger out), vacuum line is closed and distributor capsule is open to atmosphere. This allows ignition to advance. In the closed position (switch plunger in), vacuum line is open to distributor unit, retarding ignition.