Is not the resistor sometime found at an OEM coil simply to reduce radio static???? has nothing to do with performance of the coil right?
coil resistor
- Thread starter barbee6043
- Start date
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67Dart273
Well-Known Member
No, they way they work is they drop the coil voltage to approximately the same voltage that the system sees during starting, so that when you are starting, and BYPASS the ballast, you have a hot spark
They are called a ballast because they change temperature with current to "even out" current draw. As the ballast gets hotter from more current, it's resistance goes up, tending to "slow down" current flow.
There are "straight" 12V coils. The original HEI is such an example....operates without a ballast. Many industrial engines tractors and so forth use full voltage coils with no resistor
Of course discharge ignitions such as CD, MSD, etc do not run DC current through the coil. The ignition feeds a pulse to the coil, it is "just a transformer", so these systems don't use a ballast, either
They are called a ballast because they change temperature with current to "even out" current draw. As the ballast gets hotter from more current, it's resistance goes up, tending to "slow down" current flow.
There are "straight" 12V coils. The original HEI is such an example....operates without a ballast. Many industrial engines tractors and so forth use full voltage coils with no resistor
Of course discharge ignitions such as CD, MSD, etc do not run DC current through the coil. The ignition feeds a pulse to the coil, it is "just a transformer", so these systems don't use a ballast, either
73Swinger18
✱ⓈⓌⒾⓃⒼⒺⓇ
I think you are referring to the capacitor that is connected to the positive terminal on the coil. If so, you are correct. It is only to reduce radio interference. See below...
yes the capacitor sometimes fond at the coil... what I was thinking..
67Dart273
Well-Known Member
Oh, well LOL
There are/ may be several caps, "formerly known as" "condensers" in your car. The alternator, the coil, the one connected to the gauge limiter/ regulator, and probably more than one actually inside the radio in what is called a "filter network" to filter noise out of the 12V power buss
There are/ may be several caps, "formerly known as" "condensers" in your car. The alternator, the coil, the one connected to the gauge limiter/ regulator, and probably more than one actually inside the radio in what is called a "filter network" to filter noise out of the 12V power buss
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