Oh, I think he's definitely got a lean misfire somewhere in the head, but I don't think there's any iron or spark plugs involved.
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| oil consumption https://slantsix.org/forum/viewtopic.php?t=26124 |
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| Author: | SlantSixDan [ Wed Dec 12, 2007 1:29 pm ] |
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Quote: What do you guys think about Lucas Oil Stabilizer?
really good demonstration of why Lucas oil "stabilizer" is a bad idea |
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| Author: | Joshie225 [ Wed Dec 12, 2007 9:08 pm ] |
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If the carburetor is in any kind of decent shape (including choke and pull-off) and oil control is good #6 spark plug won't foul. If the carb is dribbling raw gas you'll foul plugs. If you have bad valve guides you can foul plugs. If you have bad rings you can go through a lot of oil and not foul plugs. I've had different slants that each did one. The first one at gas and sooted up the plugs. The second fouled plugs and then ran really bad, but if you changed the plugs it would burn rubber. The third used a quart of Valvoline Racing 20W50 every 200 miles, but it never smoked and did not foul plugs. The 1st needed a carb rebuild, the 2nd needed head work and the 3rd had every top ring broken. |
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| Author: | Dart270 [ Fri Dec 14, 2007 6:25 am ] |
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I have never carbon fouled a plug on a Slant Six engine - ever. Lou |
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| Author: | dakight [ Fri Dec 14, 2007 4:23 pm ] |
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Seems to me that I've read that #6 tends to run leaner than the others??? If that is the case, and he's already running lean as stated above, could he be getting a lean misfire in that cylinder and causing it to foul plugs? |
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| Author: | SlantSixDan [ Fri Dec 14, 2007 4:32 pm ] |
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Oh, I think he's definitely got a lean misfire somewhere in the head, but I don't think there's any iron or spark plugs involved.
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| Author: | dakight [ Fri Dec 14, 2007 4:36 pm ] |
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:tsk: That wasn't very helpful, Dan. 
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| Author: | dakight [ Fri Dec 14, 2007 5:10 pm ] |
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I'm really not interested in all of that. I'm just trying to understand how the known air/fuel distribution issues might interact with other issues to produce certain results. I believe it was a serious question, deserving of a serious answer. And, that's all I have to say about it. |
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| Author: | SlantSixDan [ Fri Dec 14, 2007 5:15 pm ] |
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I have no objection to your question, DK. It's deliberately disruptive behaviour from the troll I object to. To answer your question directly: No, I don't think there's a fuel distribution issue with #6 (or any other particular cylinder) that would tend to oil down any particular spark plug. Remember, the spurious claim made was that #6 spark plug is known to oil-foul in slant-6 engines in good condition. There's no way a misfire could cause oil fouling, directly or indirectly. |
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| Author: | Wizard [ Fri Dec 14, 2007 6:14 pm ] |
| Post subject: | fouling just one... |
Experience: My 2.2 did this with 2 things: 1. defective carb was bit rich that gave 13mpg consistently. 2. Head was causing this on top of that. Replaced with rebuilt head got all 4 plugs evenly fouled with soot with one side of spot clear. Finally got weber carb installed. MUCH better but fun lasted a day and automatic transmission snapped. :O It would point to manifold gasket except I replaced it eariler on when I had manifolds ground flat and this did help some but problem was really the head itself, too loose guides making valves to close poorly but yet runs well enough. What a life! Cheers, Wizard |
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| Author: | dakight [ Sat Dec 15, 2007 4:15 am ] |
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Quote: To answer your question directly: No, I don't think there's a fuel distribution issue with #6 (or any other particular cylinder) that would tend to oil down any particular spark plug. Remember, the spurious claim made was that #6 spark plug is known to oil-foul in slant-6 engines in good condition. There's no way a misfire could cause oil fouling, directly or indirectly.
Can a lean misfire occur under the circumstances I described? If the answer to that is yes then will or might that misfire cause carbon or soot fouling of the plug in question?
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| Author: | SlantSixDan [ Sat Dec 15, 2007 11:25 am ] |
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A lean misfire will generally not cause carbon-fouling as a rich misfire will, so... ...no. |
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| Author: | dakight [ Sat Dec 15, 2007 12:04 pm ] |
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Thank you. |
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