Re: Anti-Foulers causing problems?

Posted by Bus Driver on December 26, 2000 at 13:28:16 from (64.53.28.28):

In Reply to: Anti-Foulers causing problems? posted by H Fan on December 26, 2000 at 11:47:07:

Not having seen your anti-foulers, I'll tell you my experience. I had a Chev. V-8 that evidently broke the oil ring in #5 cylinder at about 76,000 miles. All cylinders had good compression, but plugs fouled quickly in #5. Used a quart of oil every about every 250 miles- same as gas fillup interval. I put an antifouler on that cylinder. The antifouler had a small hole at the cylinder end, maybe 1/4" dia. That plug stayed lilly white from then on. It must have kept the plug incredibly hot because once I found part of the porcelain from the center electrode had broken off. It was large enough that it would not go through the hole into the cylinder. The car continued to run well with this arrangement (changing all the plugs as needed) until it was retired at 147,000 miles.
My guess is that the cold is making the fuel less volatile and the fuel vapor is not getting through the small hole to the plug electrodes. This assumes that the anti-fouler is like mine was. If it was mine, I would drill the antifouler so that the full diameter of the bottom hole matched the diameter of the body of the plug. This would give better exposure of the fuel vapor to the plugs. The plugs would likely run a bit cooler than with the small hole, because they are more exposed to the incoming charge each combustion cycle but warmer than stock because they are farther from the water jacket. If you try it and do not find it satisfactory, you are out the price of a set of antifoulers. It is unlikely that the plugs will get hot enough to break in this weather. This whole exercise is not a permanent repair, of course. No doubt, others will offer other suggestions.

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