Posted by John T on December 08, 2010 at 06:43:30 from (66.244.97.31):
In Reply to: 12V Condensor questions posted by MattSillinois on December 08, 2010 at 05:54:17:
YOUR QUESTIONS
1) What does the CONDENSOR do in the distributor?
1) It greatly increases the life of the points by absorbing (shock absorber analogy) some of the energy stored in the coils low voltage primary (+ to - terminal) as opposed to it all being rapidly discharged by the arc of current (w/lots of heat) across the points. It can be considered initially an empty electron bank sitting there waiting to absorb n suck up electrons from the current which wants to continue flowing when the primary circuit is interrupted due to the opening of the points.
2) It increases the energy available for discharge across the spark plug gap as opposed to no condendor being there at all. If theres no condensor or its rating is too small, she still sparks, but theres less spark energy and the points burn up quickly. If the condensor is too big she may not spark at all (depends on condensor size) but the points last a longgggggggg time. It controls the rate of discharge of the energy stored in the coils LV primary magnetic field so as to maximize the energy transfer over to its HV secondary, which is then available for discharge across the plugs gap.
QUESTIONS
Is there a way to verify that it is working properly?
You can use a digital analog ohm meter like my Old Simpson 260 (or other meters for that matter) to see if its BAD, but that dont tell you if its GOOD. They make actual capacitor testers that are more accurate and give you the rating and leak down etc., which the ohm meter can NOT. Basically, it can NOT test out as a dead short to steady DC, if so its BAD ITS SHORTED OUT, it needs to read as an OPEN (towards infinite resistance) circuit (once charged) using a DC ohm meter (R x 1 Scale). You can also use an analog DC ohm meter on the R x 10,000 scale "kick back test" to see an indication of its charging ability.
YES they can be new out of the box and BAD but if its of good quality they can last for yearssssssssssss.
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