Posted by John T PS on August 25, 2014 at 05:46:00 from (216.249.72.121):
In Reply to: condensor posted by Leroy on August 24, 2014 at 19:38:24:
Leroy, heres a bit more technical info that may (or may not if too techy lol) help you understand why the condenser rating is important and its use and function in the Kettering Ignition system:
When the points are closed the coil conducts current and energy is stored in its magnetic field. Then when the points break open the coil/inductor (which opposes a sudden change in current) tends to discharge that stored energy and raises its voltage and an arc of current can jump the opening points gap which can burn and carbon the surfaces. HOWEVER the discharged condensor is sitting there in parallel like an empty electron bank willing and able to initially conduct current (until its charged) and absorb part of the stored energy SO THE POINTS ENDURE LESS ARCING AND BURNING.
However, if the condenser rating is too high there may not be a spark or very weak (but points last a longggggggggg timeeeeeeeeee) but if its open or too low she still sparks (weaker) but the points will burn up very fast. If its the correct size (to match coils inductance) there's less arcing across the points surfaces (last longer) and the transfer (electrons have a mass) of energy each way when points open and close is more balanced so you avoid a pit on one side and a build up on the other side.
I have observed very wide differences in condenser rating for different applications (because coils for different ignition systems can have a range of inductance values) similar to the range of 0.015 to 0.035 like Bob posted which is why I recommend the CORRECT rating be used (NOT 0.015 if twice that amount 0.030 is required), although YES Billy Bobs most any off the shelf unit still "works" and a spark will be there.
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