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12-08-2020, 12:14 AM | #1 |
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Posts: 361
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Carbon on porcelin of plugs,flathead V8
My 46 Ford JUST getting for road ,most running time spent on short test runs of mile or 2 and abit of idle run time. Plugs seem to have carbon on the porcelin and a few plugs fouled now. Plugs are all tight. What causes the darkening on the porcelin? Perhaps this was caused by heat? Thanks
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12-08-2020, 01:25 AM | #2 |
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Join Date: May 2010
Location: MN
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Re: Carbon on porcelin of plugs,flathead V8
I'm guessing you mean on the engine side. Short runs will build up more so, then when you are running it up to temp. Fouling is usually a rich mix. Best is a brown plug but to be honest I don't ever see one. But if it never leaves the driveway, that won't help. I'm not bashing, as I don't run around the country putting 1ks on my flatheads every week.
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12-08-2020, 04:07 AM | #3 |
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Re: Carbon on porcelin of plugs,flathead V8
I recently had a fan belt issue and that resulted in black deposits all over the exterior porcelain.
Interior porcelain will be mixture related Last edited by fortyonerag; 12-09-2020 at 05:25 AM. |
12-08-2020, 10:08 AM | #4 | |
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Location: Wichita KS
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Re: Carbon on porcelin of plugs,flathead V8
Quote:
You might start by posting what type and the heat range of the plugs you are using and what the jetting is on the carb(s). |
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12-08-2020, 02:30 PM | #5 | |
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Re: Carbon on porcelin of plugs,flathead V8
Quote:
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12-09-2020, 11:06 AM | #6 |
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Re: Carbon on porcelin of plugs,flathead V8
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12-10-2020, 02:10 PM | #7 |
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Re: Carbon on porcelin of plugs,flathead V8
A picture of the spark plug, would be a great help.
Dark and sooty would probably mean to much time spent, with the choke on, with your short run driving. You really need to get it on the road, for at least 10 miles, at 55+ mph and then check your plugs, to know what the basic plug/engine condition is.
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