Why is a multi-cylinder high speed engine to use a double-touch-power-distributor?

In the multi-cylinder high speed engine, since the speed of the speed is reduced, the high-speed ignition is unreliable, and some high-speed multi-cylinder engines are powered by a double contact. The two pairs of contacts of the double-contact power-off the distributor are parallel, the convex angles of the cam and the number of cylinders are equal. Take an octagonal, the cam is turned once, and the two contacts are opened 8 times. When the first pair of contacts are closed for a period of time, the second pair of contacts are then closed, and the first pair of contacts are turned on, and the circuit is still passing, etc. The second on the contact is turned off and the primary circuit is cut and generated, so that the spark always occurs when the second pair of contacts are separated, the two pairs of contacts are only affecting the closing time, and there is no impact on the fire time. Since the two pairs of contacts are overlap each other, the closing time is extended by about 85%, so the primary power-down current is increased, and the secondary voltage is improved, and the reliability of ignition is guaranteed.

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