Hi guys,

I by mistake purchase the wrong coil for HEI conversion , which is IC-27. .
where I live it is very difficult to find the IC-24.

This coil even I paid 52$ for shipping only .

My question is can I use this coil or not...please respond . Thanks

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1964 Dart GT

That I read it already . what should I do ?

Any other car specially Japanese on 70s 80s like Toyota , Mitsubishi, Honda have similar coil can I use that coil ?

Please let me know ...... buy the way it is essential to correct the document on SL6 group because it confusing specially for coil selection. here it is what it says . remove this paragraph

"Coil selection

Your stock coil might work OK for awhile, but really isn't a good choice. At the very least, replace it with a coil meant for use with electronic ignition. Such a coil would be a Standard-BlueStreak #UC16 or NAPA Echlin #IC27. It's best, though, to use a coil intended for use with a high energy ignition system. If you'd like to mount the module off by itself somewhere, then a good coil option is the stock external-mount E-core coil used with Ford and Mazda high-power electronic ignition systsems. The premium version is Standard BlueStreak #FD-478X:

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I think either one will work...........

I'm trying to find the specs on both coils.

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Ed
64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes

Where did you get the coil from, that you paid $52 for shipping???

We use an IC27 on our tractor(6v) and I believe it is just over 2 ohms, it might work for HEI ,but not for long! and I don't think you could get away from the ballast resistor.

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1964 Dart GT

I got the coil from Napa store which cost 29.7$ then it was post to me by my friend cost 52$

Any how so it means I have to have IC24 to work with TP45 and electronic distributer .

is there any JAP equivalent to IC24?

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Your HEI module should work fine with the IC27- you already own it so there's no reason NOT to intall it. It's just that a HEI/ E-core style coil (like the IC24) will "work better"- it will have higher spark output voltage potential & duration. That's the advantage to using a modern coil that has a low primary resistance: you can flow more primary current, charge the coil faster, & put more energy into the secondary windings- & get more out. The HEI module doesn't care if the coil primary is 0.5 ohms (like HEI style) or 2.0 ohms (like IC27) or higher- the module just turns primary current on then off as dictated by the pickup coil signal.

I say the IC27 "should" be fine because of how HEI works. That coil is a stock replacement type for many Chyslers with electronic ignition. The Chrysler module is turned "on" continually until it fires a spark. So primary current is flowing through the coil 95-98% of the time- it needs an external ballast resistor to limit current & volts so the coil won't overheat. HEI only turns "on" briefly before it fires- current flows for about 15% of the time (at idle) up to over 65% (above 3000 rpm). Much less "on" time = less average current flow overall & less heat- so the IC27 should last ok- but I haven't tried it.

I can't give you a specific part number for another coil to try- really any 12V ignition coil with a primary resistance of 0.5 - 1.0 ohm or so should work well. The difficulty is that companies like NAPA & Standard Motor Products no longer have (easy to find) electrical specs for parts (like ignition coils) on their "online" buyer's guides. I used to be able to page through an actual physical book: compare specs, pics, applications, etc.- then choose whatever item seemed best for my purposes.

If you have easier access for Japanese makes then you'll need to do your own research. Find an external mount coil for something popular (& cheap) in your area then look online for service info about the specs for that coil- see if it needs special electrical connectors & such. It's really handy if you can go looking for stuff in a junkyard. There are quite a few Toyota / Honda / Mazda models from the early 90's that had external coils (as well as lots that had the coil built into the distributor.)

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63 Valiant Wagon
225 - 4 bbl

You can look at Toyota Hilux/Land Crusier coils for the early 90's for the 22R engines. Those have primary resistances of 1 to 1.5 ohms so is not an ideal HEI coil but is perhaps better than the IC27.

The Celica 2.0L turbo coils have primary resistances of about 0.5 ohms but may be harder to find.

Thanks guys ,

I have purchased IC-24 from e-bay in 20$ . waiting for its arrival in Karachi.

mean while can some one tell me how to check the primary side ohm ?

Regards,

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Primary is between the + & - terminals

Secondary is between the spark plug socket and either of the +,- terminals

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Ed
64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes

If you are asking what equipment to use for measuring ohms:

Do you have a voltmeter that can also measure resistance? Use that type of meter and set it to measure resistance. Then connect it as described in the post above.

Only American...

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Brian Doak CMfrT