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Old 03-31-2015, 10:37 PM   #1
39topless
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Default Hotter plug, less carbon?

After my own research turned up nothing on the subject, I hope some one here can help. I am running 3 X 2's on a stock, 39 V8. It, as they all do with this setup, runs rich which creates a carbon build up. If I run hotter plugs (eg. H12 ) will that help with this problem?
Thank you,
Phil

Last edited by 39topless; 04-01-2015 at 09:24 AM.
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Old 03-31-2015, 11:45 PM   #2
Lawrie
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Default Re: Hotter plug, less carbon?

How would running lean create a carbon build up? this would be from oil in the cyl or too rich
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Old 04-01-2015, 12:11 AM   #3
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Default Re: Hotter plug, less carbon?

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How would running lean create a carbon build up? this would be from oil in the cyl or too rich
Lawrie
Agree.
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Old 04-01-2015, 12:28 AM   #4
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Default Re: Hotter plug, less carbon?

Double agree. And that's an awful lot of carburetion for a 221 cubic inch engine
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Old 04-01-2015, 12:44 AM   #5
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Default Re: Hotter plug, less carbon?

three carbs should create an awful lot of black carbon from to much gas for the engine, hotter plugs might help, but go to far and you may get pre ignition
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Old 04-01-2015, 04:21 AM   #6
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Default Re: Hotter plug, less carbon?

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Remove or block off two of the three carbs , run it and see what happens , then work from there, if it has carbon build up it no doubt is getting too much of something. (fuel or oil) if oil is suspected run a wet and dry compression test, if fuel then the cylinders are being washed down and if not corrected soon,get out a shovel and get ready to bury it , the engine will be short lived.
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Old 04-01-2015, 06:00 AM   #7
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Default Re: Hotter plug, less carbon?

You may want to contact Charlie Schwendler, NY (if your running 94's) or Max Musgrove, UT (if your running Strombergs)and ask them about jets and power valve sizes to see if you can get the engine leaned out. Yes a hotter plug will burn a bit cleaner but there are limits. What type of linkage are you running? Progressive? If so the front and rear carbs are just dumpers and have to have some work done to them to remove their idle circuits.
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Old 04-01-2015, 09:26 AM   #8
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Default Re: Hotter plug, less carbon?

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Originally Posted by Lawrie View Post
How would running lean create a carbon build up? this would be from oil in the cyl or too rich
Lawrie
I stated lean, meant rich.
Thanks
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Old 04-03-2015, 12:47 AM   #9
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Default Re: Hotter plug, less carbon?

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Originally Posted by 39topless View Post
I stated lean, meant rich.
Thanks
Now that's a plug of a different color!
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Old 04-03-2015, 06:29 AM   #10
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Default Re: Hotter plug, less carbon?

I get a rich plug test if I check plugs after it isn't shutdown after a hard pull. I have 2 ecg"s with [ 51 jets, I think?] on my 3/3/4 by 3.5/16 Runs good on the road .
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Old 04-03-2015, 12:25 PM   #11
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Thumbs up Re: Hotter plug, less carbon?

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Originally Posted by 48 coupe View Post
I get a rich plug test if I check plugs after it isn't shutdown after a hard pull. I have 2 ecg"s with [ 51 jets, I think?] on my 3/3/4 by 3.5/16 Runs good on the road .
Great information. Thank you
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Old 04-03-2015, 04:33 PM   #12
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Default Re: Hotter plug, less carbon?

I'm running H12s in mine, gets a better plug colour. So far, so good.
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Old 04-03-2015, 09:11 PM   #13
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Default Re: Hotter plug, less carbon?

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I'm running H12s in mine, gets a better plug colour. So far, so good.
Ok, I'll give those a try. Thanks
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Old 04-04-2015, 08:13 AM   #14
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Default Re: Hotter plug, less carbon?

What kind of linkage, straight or progressive? Had a friend run 3x2 straight linkage. Carboned up so bad that the accumulation of crud broke a valve head off and beat up the valve area as it rattled around loose. Destroyed the block of a good engine. Beware.

Just go for the looks. Run off the center and dummy up the ends.
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Old 04-04-2015, 10:49 AM   #15
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Default Re: Hotter plug, less carbon?

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What kind of linkage, straight or progressive? Had a friend run 3x2 straight linkage. Carboned up so bad that the accumulation of crud broke a valve head off and beat up the valve area as it rattled around loose. Destroyed the block of a good engine. Beware.

Just go for the looks. Run off the center and dummy up the ends.
Progressive. Can't imagine running straight linkage with three carbs. Gas-O-Rama!!!. Thanks for the tip.
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Old 04-04-2015, 12:25 PM   #16
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Default Re: Hotter plug, less carbon?

You're welcome. Just noticed that you are in Colorado. Be sure to tell whoever you get jets from your elevation.

I run a 48 in the middle with 2 blocked off 97's at the ends. Originally I had stock jets in the 48 but Max recommended me others that jetted it more like a 97. Helped a lot.
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