The Ford Barn

19Fordy · 02-21-2018, 04:14 PM

Is is ok to use this coil with a Mallory Unilite breakerless Ignition system.
My goal is to eliminate the ballast resistor and prevent the electronic module from overheating and burning up.
https://www.ebay.com/itm/IGNITION-CO...72.m2749.l2649

I think I read somewhere on HAMB that 3 ohm coils can be used on 4 and 6 cylinder engines only.
Thank you. JIM

JSeery · 02-21-2018, 04:26 PM

Quote:

Originally Posted by 19Fordy

I think I read somewhere on HAMB that 3 ohm coils can be used on 4 and 6 cylinder engines only. Thank you. JIM

Don't believe that is true, at least not in general, no idea on Unilite specific. 3 ohms is what you normally shoot for (1.5 coil + 1.5 ballast or 3.0 coil). But again, no idea on Unilite specific.

40cpe · 02-21-2018, 04:32 PM

The '55 I bought came with a pertronix that usually calls for a 1.5 ohm coil. It had a 4 ohm coil working with the Pertronix. I changed to a later distributor and needed another Pertronix unit. I called pertronix and they said more resistance is fine, just maybe less high rpm performance. Again, not related to Mallory ignition.

flatheadmurre · 02-22-2018, 01:25 AM

The charge up time for the coil using it on a Flathead is a non issue and with the plug gap we have the voltage required is low so just about any coil will work fine.
The need for real high currents to be able to charge the coil fast is for the guys with wide plug gaps and scary high red lines on the tach.
So the 3 ohm coil will work fine.

trevo · 02-22-2018, 01:39 AM

I have Malllory Unilight fitted for 3 years or more and I use a 3 Ohm coil which seems to match just fine cheers

BUBBAS IGNITION · 02-22-2018, 06:30 AM

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Dont know about the "Beru" blue coil. What we have used is the Bosch Blue at 3 ohms. With .025 plug gap and unilite ignition..

https://www.ebay.com/itm/IGNITION-CO...RXcsh1&vxp=mtr

Sometimes theres a deal on Amazon.

The four cylinder discussion and 3 ohms concerns RPM. For high rpm engines the coil at 3 ohms dont have time for coil buildup at high rpm (7000 etc).
A flathead isnt considered a high rpm engine..

02-21-2018, 04:14 PM	#1
19Fordy Senior Member Join Date: May 2010 Location: Coral Springs FL Posts: 10,951	3.3 ohm, 12V Coil Question on Unilite Ignition Is is ok to use this coil with a Mallory Unilite breakerless Ignition system. My goal is to eliminate the ballast resistor and prevent the electronic module from overheating and burning up. https://www.ebay.com/itm/IGNITION-CO...72.m2749.l2649 I think I read somewhere on HAMB that 3 ohm coils can be used on 4 and 6 cylinder engines only. Thank you. JIM

02-21-2018, 04:32 PM	#3
40cpe Senior Member Join Date: May 2010 Location: Star, MS Posts: 4,024	Re: 3.3 ohm, 12V Coil Question on Unilite Ignition The '55 I bought came with a pertronix that usually calls for a 1.5 ohm coil. It had a 4 ohm coil working with the Pertronix. I changed to a later distributor and needed another Pertronix unit. I called pertronix and they said more resistance is fine, just maybe less high rpm performance. Again, not related to Mallory ignition.

02-22-2018, 01:25 AM	#4
flatheadmurre Senior Member Join Date: Apr 2015 Location: Sweden Posts: 3,045	Re: 3.3 ohm, 12V Coil Question on Unilite Ignition The charge up time for the coil using it on a Flathead is a non issue and with the plug gap we have the voltage required is low so just about any coil will work fine. The need for real high currents to be able to charge the coil fast is for the guys with wide plug gaps and scary high red lines on the tach. So the 3 ohm coil will work fine.

02-22-2018, 01:39 AM	#5
trevo Senior Member Join Date: Dec 2011 Location: Napier NZ Posts: 299	Re: 3.3 ohm, 12V Coil Question on Unilite Ignition I have Malllory Unilight fitted for 3 years or more and I use a 3 Ohm coil which seems to match just fine cheers

02-22-2018, 06:30 AM	#6
BUBBAS IGNITION Senior Member Join Date: May 2010 Location: SPEEDWAY INDIANA Posts: 4,148	Re: 3.3 ohm, 12V Coil Question on Unilite Ignition Sponsored Links (Register now to hide all advertisements) Dont know about the "Beru" blue coil. What we have used is the Bosch Blue at 3 ohms. With .025 plug gap and unilite ignition.. https://www.ebay.com/itm/IGNITION-CO...RXcsh1&vxp=mtr Sometimes theres a deal on Amazon. The four cylinder discussion and 3 ohms concerns RPM. For high rpm engines the coil at 3 ohms dont have time for coil buildup at high rpm (7000 etc). A flathead isnt considered a high rpm engine.. __________________ If it Makes Spark, we do it !!!! www.bubbasignition.com [email protected]