The Causes of Tungsten Points’ Ablation of Car Distributor – IV

The causes of tungsten points’ ablation of car distributor as seen below:

7. Soft spring of tungsten points’ arm of distributor. If the tungsten points’ arm spring is much too soft, when the car operating at low speeds, the flashover condition remain normal; due to the high speed inertia effect of the engine, tungsten points’ closure is more slower when the car is operating at a high speed, and the off-fire phenomenon will occur, therefore, the car's exhaust pipe will issue a irregular sound like "sudden, sudden, sudden". Besides, tungsten points will appear rebound phenomenon after closing, and the appearance of spark will be more vulnerable, ultimately tungsten points will be ablated.

8. The ground capacitor is bad. Due to the weak spark, the flashover distance is shorter when test fire, therefore, when the engine is operating at no load, it will be more normal. But the car is instable in operation process, the carburetor will appear tempering phenomenon, and when the engine is working at high speeds, the exhaust pipe will sometimes shoot. So the arcs of tungsten points will increase, and ablate tungsten points eventually.

 

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