coil petronix 40011 1.5 ohms question

[nick c]

I bought a new coil 400111, the instruction give a multiple choice on weather or not to use a resister. Need your input.
thanks nick c

[Bob C]

Is your ignition 6V or 12V?

Bob

[barkleydave]

Voltage makes no difference. If using a 1.5 ohm coil you use a Resistor.
3 ohm coil no resistor is required.

I received this info direct from F.S. Ignitions I am using a 1.5 Ohm with resistor on third year no issues.

[updraught]

The trouble shooting guide for FSI has "minimum" resistance for the two voltages

http://www.fsignitions.com/uploads/T...ide_9-7-10.pdf

From memory the V8 forum discusses this a fair bit.

[Y-Blockhead]

Use the 40111 coil 1.5 ohm for 6 volt system and the 40611 coil 3 ohm for 12 volt system. No ballast resistor required.

[Patrick L.]

Sponsored Links (Register now to hide all advertisements)

40111; 6v, no resistor
12v; resistor needed


So which coil do you have, 40011, 40111 or as you posted 400111 ?
The 40011 should be oil filled and not happy with a Model A
The 40111 is epoxy filled and will be very happy on the Model A
I don't know about a 400111.


Thoroughly confused now aren't you !

[nick c]

Yes 12 volts, does the resister go between coil and dist. or between ign sw and coil?
thanks

[Jim/GA]

Originally Posted by nick c

Yes 12 volts, does the resister go between coil and dist. or between ign sw and coil?
thanks

On a "modern" car from the 1950s, 1960s, etc., they would put the resistor between the ignition switch and the coil power feed wire.

This is not how Henry originally wired the Model A. He had power to the coil all the time on one post and the ignition switch was inserted between the second coil wire post and the distributor. A detail that you need to be aware of. So if he were putting a resistor in, he would put it in the wire that powers the coil all the time.

Wire it how you like.

[Bob C]

Originally Posted by barkleydave

Voltage makes no difference. If using a 1.5 ohm coil you use a Resistor.
3 ohm coil no resistor is required.

I received this info direct from F.S. Ignitions I am using a 1.5 Ohm with resistor on third year no issues.

This is also from FS.
Co
il
FSI provides correct coils with each electronic ignition system. If you are not using the coil provided by FSI, it is
critical that the OHM output of your coil is correct. To check the primary resistance of the coil, connect one lead
of an OHM meter to the positive (+) terminal and one lead to the negative (-) terminal of the coil at 70°F for best results.
MINIMUM PRIMARY RESISTANCE:
FSI 12V Electronic Ignition System: 3.0 to 3.5 OHM FSI 6V Electronic Ignition System: 1.3to 1.5 OHM