HEI conversion Dodge ram truck coil

Bewy said

George,
I have this info from a very knowledgeable electrical engineer. Checking the pri resistance of an ign coil with a digital meter will give an accurate reading. But checking the sec resistance can lead to errors & an analogue DVM should be used. He did say the reason, but it escapes me...I think it has something to do with the magnetic field that is generated whilst measuring the resistance.

Click to expand...

It is really interesting how these coils work.

Building a magnetic field when 12 volt power is applied to the primary winding.

Then when the signal is broken, it collapses the magnetic field inward to the many windings of the secondary. Creating an electrical charge that gets sent out to the distributor cap and on to the spark plugs to fire the fuel.

The e-coils are able to build a bigger magnetic field, in turn producing a hotter spark. It's the heat of the spark that lights the fuel.

Fascinating


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