Has anyone ever used these plugs and if they are good what would the PN be for my application? My motor is 10.5:1 compression.

Been trying to clean up my idle some, runs pretty rich right now. Took away some mechanical advance to where I could run more initial and that helped quite a bit. Initial now at 15 with total about 34 degrees. It was at 8 and total 34. Thanks!!

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Alex Denysenko
Co-Administrator and Moderator/ non 65-66 Mustang owner sensitivity co-ordinator

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Originally posted by Moneymaker:
I don't like Champions as a rule

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Neither do I. Come to think of it, I don't know anyone who does. Why is that? Do they really suck that bad?

quote:

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Originally posted by Moneymaker:
What's the part number please? I don't like Champions as a rule but I will give my oppinion.

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PN C59CX, I'm not a big fan of Champion plugs myself but these did look nice.

quote:

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Originally posted by chips67:
have always had my best luck with cheap autolites and motorcrafts. all the zooty "quadruple electrodee platinumus splitfire" plugs fail to beat most $.89 autolites....champions/ac delco/accel/bosch all stink in my experience. are the plugs you are running the ones afr recomended?

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Yes but cross referenced to a Autolite number,3923. I think my AFR paperwork recommended a AC plug. A friend of mine told me Autolite also makes a side gapped plug that I can get locally also. He said he picked up a 1/10 in the 1/8. That was on a tubbed, lenco, stroked iron head clevend car.They are not anything fancy as far as material just side gapped and have a larger width ground strap. I guess the idea is to better expose the spark kernal to the chamber.

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Alex Denysenko
Co-Administrator and Moderator/ non 65-66 Mustang owner sensitivity co-ordinator

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Originally posted by Moneymaker:
Too cold for your application.

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Thanks Alex, I look at finding the autolite side gapped plugs in my current heat range. You wouldn't happen to know that PN would you? Use 3923's now. Thanks again.

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Originally posted by 67Coupster:
I look at finding the autolite side gapped plugs in my current heat range. You wouldn't happen to know that PN would you? Use 3923's now. Thanks again.

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Autolite AR3932 is what you want. I have been using the AR series plugs for 2 years now. Love 'em.

Here is the listing for the Autolite Racing plugs. They have nickel plated bodies, a back-cut electrode (side gap). The listing is in .pdf format, so you need Adobe Acrobat to read it. This crossreference also has the Champion and NGK plugs. The C59CX is a little hotter than your plug, The C59CX crosses to a AR3933, one step hotter than yours. Your 3932 crosses to a C57CX. They are available for you in 4 heat ranges. The AR3932 is the coldest. Then AR3933, AR3934, AR3935 is the hottest.

http://cpgparts.alliedsignal.com/cpg/catalog/autolite/legal/RacingCrossRef.pdf

BTW, since you are in Ga, I know you have an Advance Auto Parts around somewhere. They can get these plugs for you overnight. Or at least they can get the ones I use (AR135 for my Windsor Sr iron). Only cost $1.79 each.

Later,

David Cole

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Originally posted by chips67:
Coupster, do you launch off a 2-step?

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I don't have a 2-step, I light the top bulb set my line lock with a little pressure bring it up to my launch rpm bump the clutch till I light the bottom bulb and go.

quote:

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Originally posted by Dave_C:
Autolite AR3923 is what you want. I have been using the AR series plugs for 2 years now. Love 'em.

Later,

David Cole

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Thanks for the link and help David, I'll try and order some today.

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Originally posted by chips67:
which is it...AR3932 or AR3923? im lost! can these plugs help me any?

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I went to the AFR website, they recommend using Champion RC9YC which cross references over to the Autolite AR3923. I also went to the link that David posted for the cross reference chart and printed it for future reference. I don't know if it will help or not but for about $16 I'll give it a try.

Later

quote:

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Originally posted by chips67:
which is it...AR3932 or AR3923? im lost! can these plugs help me any?

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Sorry, I transposed the numbers. Fixed now. The plugs I was talking about as crossing to the side gapped Champions are are AR3932 through AR3935. Can't speak for your heads or plugs, but the AR plugs were worth .06-.07 in my car vs regular Autolite's. I consider that great for just a plug change.

BTW, I went to Advance Auto this morning ordered 2 sets of AR135 for my Windsor Sr irons. The price is now $1.59 each, at least for mine. Don't know on yours.

One other thing. They come pre-gapped due to the back-cut electrode. Don't mess with the gap.

Later,

David Cole

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Alex Denysenko
Co-Administrator and Moderator/ non 65-66 Mustang owner sensitivity co-ordinator

Look here for Autolite's number system:
http://cpgparts.alliedsignal.com/cpg/catalog/autolite/legal/SPNumbering.pdf

Later,

quote:

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Originally posted by Dave_C:
They should be the same, except the 3923 is a resistor plug and the 3933 is non-resistor.

Later,

David Cole

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That's what I was thinking, I guess I was reading to much into the number system. Is there any problem running non-resistor plugs?

Thanks!

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James
67 Coupe
393W, AFR 185, 4 Speed, 4.11 9 inch
7.09 @ 97MPH 1/8
1.55 60'