Posted by jdemaris on December 26, 2007 at 12:58:37 from (67.142.130.26):
In Reply to: 12 volt front coil posted by Gary Alford on December 26, 2007 at 07:50:06:
In reference to internal resistance coils not ever exisiting -
Bob stated:
"Can you PROVE you've EVER seen EVEN ONE coil with an INTERNAL RESISTOR, as opposed to simply more windings? I think the idea of the almost "non-existant" "INTERNAL" resistor is REALLY a persistant MYTH "
It's not a myth at all. It used to be common in many systems including Remy, Delco, Atwater Kent, Connecticut,Willys-Knight, etc. Many had a removeble caps that pried off the top of the coil so the resistor could be repaired or replaced without changing the whole coil. The resistors were not there just to preserve point and coil life, they were also there to prevent dead batteries when igntion switches were left on. Here's a description from a 1930s Dykes Auto and Tractor Repair manual:
"The purpose of the ingition resistance unit is twofold, one being to protect the battery from discharging back through the primary winding and thus overheating the winding and discharging the battery if the switch is left on and the engine is not running and the breaker points are closed. The igntion resistance is made of iron wire, usually mounted inside the top of the coil mounted on a porcelain spool. It turns cherry red when the primary current flows through it for any length of time. If current is left on for a long period of time, the resistance may burn out. This sort of thing happens frequently. "
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