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Old 09-06-2005, 01:15 PM
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front plug fouling

Both my front plugs are fouling. I have been told that due to aluminum heads, the cylinders closest to the waterpump tend to run cooler. Has anyone had a similar problem? I have tried various different plugs and finally tried iridium plugs which bought me more time out of the plugs.
Thx Ted

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Old 09-07-2005, 05:35 PM
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Nobody had this problem before?? Anyone have any ideas??
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Old 09-07-2005, 07:05 PM
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What engine?

Larry
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Old 09-08-2005, 06:57 AM
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It's a small block chevy.
Thx
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Old 09-08-2005, 07:38 AM
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Here is a bit more info:
I have been dealing with this issue for a couple of years now. The two front plugs are fouling. I have tried various different plugs, the motor runs great. If I run the car around town, the two front start to break down and miss. When I inspect them, they are very sooty. The rest of the plugs are a nice colour. Recently I replaced all the plugs for iridium (NGK). This bought me more time between replacement, but still have to change those #@&* front plugs. If I go on a highway run, the front plugs look as good as the rest of them and no break down. I was told that with aluminum heads, being close to the waterpump, run cooler which makes some sense to me. The motor is a stock bore 350 sbc, 11.3/1 compression, hydralic cam 244 / 253 deg @ .50 .533 lift, 700 CFM D/P If anyone has any ideas or has had a similar problem, let me know. If you need more info, please ask.
Thanks!
Ted
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Old 09-08-2005, 10:09 AM
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I would suspect plug wires or the dist. cap first--sounds like the front plugs aren't getting full spark. Lower RPM town driving would increase the prob. You may want to check for air leaks at rear areas of intake and rear of carb.
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Old 09-08-2005, 10:15 AM
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Quote:
I have been told that due to aluminum heads, the cylinders closest to the waterpump tend to run cooler.
That's a load of bull...

Are the plugs fouled with gas or fouled with oil or what? got a picture?
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Old 09-08-2005, 11:01 AM
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sorry no picture. The appearance of the plug is sooty except the end of the electrode which is a tiny white "spot" The buildup appears to be of a rich situation which can be easily wiped off. It is not a oil problem. When the plugs are changed, the motor runs perfect.
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Old 11-30-2005, 04:23 PM
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I thought that I should bump this as the situation is a concern to me and it is being lost in the "archives"
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Old 11-30-2005, 04:59 PM
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if that was true, everybody would have a problem, run a compressure check,change spark-wires
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Old 11-30-2005, 05:06 PM
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For some reason or other those two cylinders are running rich and your gassing your plugs. Thats what it sounds like anyway.
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Old 11-30-2005, 05:41 PM
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What temp thermostat...?
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Old 11-30-2005, 06:14 PM
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what intake and has it every been replaced? It could be an uneven distribution from a poorly cast intake or obstruction...if it's fuel injected could have leaking injectors. We need alot more information....it's not because of aluminum heads. It sounds like you are getting a different A/F ratio on these two cylinders, but without knowing some more about the setup it a wild guess.
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Old 11-30-2005, 07:08 PM
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Doc here,

Try reducing the gap on the front two plugs from 45 to say 32, and drive it for awhile and see if the problem declines..

If so, get a better (hotter) coil, and better Wires.

Doc
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Old 11-30-2005, 09:45 PM
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If you think about it, the front two cylinders should be the last to recieve the water due to its flow route (in through the bottom, out through the top). By that time the water has run through the entire engine thus soaking up heat to be radiated outwards through the . . . radiator. The truth is there should be very little variance of the cylinder head temperatures as you go from to back. If you think about it more, the back driver side of the engine should be the hottest as you have two cylinders next to eachother firing one right after the other.

Have you changed wires or checked them?
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