1950's Bosch Pendulum Starter solenoid in action

Unlike other electric starters, the Bosch pendulum starter of the '50s rocks the engine's crankshaft back and forth rather than rotate it. A somewhat complex system of contact switches and a solenoid makes sure that the plug fires multiple times during the starting attempt, but only while the engine is turning in the forward direction.

In this video, you can see the various switches opening and closing and the solenoid working.

The idea behind this starter design is that it takes much less electrical power to just rock the crankshaft than it would to spin it over past the combustion chamber's compression. By rocking it back and forth and generating multiple ignition sparks only while the engine is moving forward, the starter simply has to fire the engine enough to "bump" it past the compression point, where the engine will generate enough momentum to start rotating on it's own and begin running.

Category:

Autos & Vehicles

Tags:

• vintage
• motorcycle
• scooter
• maicoletta
• oddscoot

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