Well as said before, its the cheap way of making them..
They are made to break, as no electrical engineer would design an component like this in this way.
In the "good old days" these inner coil of foil had a wire of thin foil spot welded to the coil on both sides, the one would be spot welded inside the cap, the other would be looped around the lid seal and welder to the wire connection.
The new ones are just pressed against the tin on one side with an spring washer spacer and the other a dome cap with wire on one side for your connection to points.
The touching ends, start to spark and carbon up, which effects the speed capability of the cap, giving a number of issues other then total open circuit.
Have bought one from Bosch, at R230.00 no less, but it was made in Turkey, and it looks to be of the same construction.
Will fit it to the next dead cap replacement and see if it also dies.
It would appear that with a smaller load coil, it may hold, but with the heavy Bosch coil we need to use, it gets burnt up and useless after 700 Km.
That seams to be the mileage I get per Cap.
Here are a few Photo's, please see the carbon build up.
Herman
