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Re: Re: 12 Volt coil got hot and blew up
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Posted by RAB on April 28, 2004 at 11:29:54 from (195.93.34.11):
In Reply to: Re: 12 Volt coil got hot and blew up posted by txblu on April 28, 2004 at 09:29:52:
As the coil is an inductor the running current will rise exponentially and so would be less than 70% of the maximum current (when the current will obey Ohm's Law). Remember, as well dwell angle is time points are closed (I forgot and got it wrong way round early one morning!).
Furthermore, even a change from 70% to 100% current is actually a 43% rise in current......and so it will practically be more than this!!
Of course, in a well designed system the cheapest component, or easiest to fix, should have gone pop first - not the most expensive component! - so it might need a smaller (power rating) ballast resistor of a higher ohmic value (if needed) to protect the new coil. Kinda complicated, so I suspect that some non standard parts may have been fitted at some stage, as I am sure the original system would have been tested, like this one, by lots of owners over the years, and not too many coils would have exploded.
Regards, RAB
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