Wet, black soot
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Senior User
Joined: Apr 2010
Posts: 331
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From: Okie
Wet, black soot
Hey Guys,
Wondered if I needed to be concerned with the moisture and black soot coming out of the exhaust on my 77 when it idles.
400 engine with Hedman headers, Flomaster 40s - on their sides, dumped at the rear axle.
When I start it and warm it up in any weather, I end up with a black carbon and water puddle under each pipe. No blue or white smoke, just common exhaust fumes, both at high and low idle.
What's the deal???
Wondered if I needed to be concerned with the moisture and black soot coming out of the exhaust on my 77 when it idles.
400 engine with Hedman headers, Flomaster 40s - on their sides, dumped at the rear axle.
When I start it and warm it up in any weather, I end up with a black carbon and water puddle under each pipe. No blue or white smoke, just common exhaust fumes, both at high and low idle.
What's the deal???
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
Sounds like you're running rich. What kind of carburetor is this? If it's the factory Motorcraft 2-barrel, then it's possible the power valve (or gasket) is letting fuel seep past. Or, the mixture screws are set incorrectly. You should set the idle mixture with a vacuum gauge.
To answer your questions, no, it's not supposed to happen. As far as it hurting anything, probably not in the immediate future, but running over-rich can dirty up your spark plugs more easily, and coating the combustion chambers with carbon deposits over time can lead to carbon hot-spots, which leads to dieseling after the engine is shut off. And in any case, you'll need to fully understand the source of the issue before assessing the risks.
To answer your questions, no, it's not supposed to happen. As far as it hurting anything, probably not in the immediate future, but running over-rich can dirty up your spark plugs more easily, and coating the combustion chambers with carbon deposits over time can lead to carbon hot-spots, which leads to dieseling after the engine is shut off. And in any case, you'll need to fully understand the source of the issue before assessing the risks.
New User
Joined: Nov 2011
Posts: 20
Likes: 0
Sounds like you're running rich. What kind of carburetor is this? If it's the factory Motorcraft 2-barrel, then it's possible the power valve (or gasket) is letting fuel seep past. Or, the mixture screws are set incorrectly. You should set the idle mixture with a vacuum gauge.
To answer your questions, no, it's not supposed to happen. As far as it hurting anything, probably not in the immediate future, but running over-rich can dirty up your spark plugs more easily, and coating the combustion chambers with carbon deposits over time can lead to carbon hot-spots, which leads to dieseling after the engine is shut off. And in any case, you'll need to fully understand the source of the issue before assessing the risks.
To answer your questions, no, it's not supposed to happen. As far as it hurting anything, probably not in the immediate future, but running over-rich can dirty up your spark plugs more easily, and coating the combustion chambers with carbon deposits over time can lead to carbon hot-spots, which leads to dieseling after the engine is shut off. And in any case, you'll need to fully understand the source of the issue before assessing the risks.
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