Tool Talk
Classic Auto and Motorcycle Tools => Classic Auto and Motorcycle Tools => Topic started by: HeelSpur on May 29, 2013, 06:24:59 PM
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what is the black stuff inside these old coils?
(http://imageshack.us/a/img713/7734/012bfm.jpg)
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Formerly, ignition coils were made with varnish and paper insulated high-voltage windings, inserted into a drawn-steel can and filled with oil or asphalt for insulation and moisture protection. Coils on modern automobiles are cast in filled epoxy resins which penetrate any voids within the winding.
Wiki- http://en.wikipedia.org/wiki/Ignition_coil (http://en.wikipedia.org/wiki/Ignition_coil)
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Don't forget the PCB's.
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Formerly, ignition coils were made with varnish and paper insulated high-voltage windings, inserted into a drawn-steel can and filled with oil or asphalt for insulation and moisture protection. Coils on modern automobiles are cast in filled epoxy resins which penetrate any voids within the winding.
Wiki- http://en.wikipedia.org/wiki/Ignition_coil (http://en.wikipedia.org/wiki/Ignition_coil)
Asphalt, I guess whatever gets the job done, thanks.
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Too early for PCB's, they hadn't invented them yet, but they used more or less the same gunk in florescent light fixture ballasts later , with PCB's....
Asphalt and coal tar were among the few things that would keep water from getting into the windings...
(Paper loves water)
Unfortunately, it also burns , and melts in really hot engine compartments...
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Which is exactly why the early Ford T's had them on the firewall inside the driver's area.
Those can be completely undone and rebuilt back to like new. Some are quite hard to find, the mid to late T versions quite easy.
Those who restore old hit and miss flywheel engines like to use those to fire the spark plug also.