recommended current through 6 volt coil primary
 

Can anyone tell me what the recommended current (amps) should be running through a 6 volt ignition coil primary circuit in order to provide long life on ignition points on a model A ford. I can calculate the resistance just need the suggested amps

Re: recommended current through 6 volt coil primary
 

Should be around 3 amps

Re: recommended current through 6 volt coil primary
 

Long life is mostly provided by a properly functioning capacitor (condenser) to counter the inductance of the coil. Current/voltage varies with generator output @ rpm.

Re: recommended current through 6 volt coil primary
 

ok I willgo with three amps
Thank you
Tom

Re: recommended current through 6 volt coil primary
 

Current should be measured w/the engine idling. Current when engine is not running will be a higher.

Re: recommended current through 6 volt coil primary
 

The peak current won't be lower, the RMS (average) will be lower. In that case, it will depend on the cam lobe shapes (which changes dwell time). The simple answer to OP's question was in static amps with the circuit energized. So, I went that route.

Re: recommended current through 6 volt coil primary
 

Primary has dc resistance of 1.5 ohms, minimum battery of 6 volts gives 4 amperes, times dwell of 90%(?) is average 3.6 amps. But only if you believe the math.

Re: recommended current through 6 volt coil primary
 

I was waiting for it .... eventually we would get to Mr. Ohm and E=!R (V=IR)
Joe B

Re: recommended current through 6 volt coil primary
 

Oh, my head hurts.:confused:

Re: recommended current through 6 volt coil primary
 

Oh, not that bad, could be worse, like E=MC²:eek: