Wet Black Soot Exhaust
 

My 38 runs well, however when I start the engine wet black soot shoots out the exhaust pipes. It makes a mess in the driveway. No drop in coolant or increase in oil. No gray smoke in exhaust. It does seem to be more than condensation. What is it?

Re: Wet Black Soot Exhaust
 

Since your not loosing coolant, the water has to be condensation and the black soot is most likely a rich burning condition. Pull several plugs and check for the soot deposits on them. If you baby the engine a lot or the carb has problems, the soot can build up. Depending upon the moisture in the air the there can be a lot of condensation.

Re: Wet Black Soot Exhaust
 

i had that till I blew the carbon out of her. rich idle condition contributed greatly. Ken ct rebuilt the carb. It was after that the soot quit showing up. I do run 100 miles a week at highway speed, 60-65. as for the water you can put 1/8 holes at the exhaust low point etc. but I'm not seeing that either anymore and I didn't drill the exhaust..

Re: Wet Black Soot Exhaust
 

Put a large bottle of Barr's heavy duty aiuminum stop leak in and it will stop. G.M.

Re: Wet Black Soot Exhaust
 

Barr's stops condensation in your exhaust? And carbon from a rich mixture?? ..B.

Re: Wet Black Soot Exhaust
 

would you happen to live in a damp climate? as I do, if so bk53 is correct and do pull the plugs to look at them. I have been using NGK and Autolite 216 with better results than the AC plugs for some strange reason also check for a good spark

Re: Wet Black Soot Exhaust
 

I have LOTS of old Fords and most did this and the Barr's stops it. On a cool day you will get a little condensation but what was described is a typical small leak. This mixes with the carbon in the pipes and muffler and makes the black mess. G.M.

Re: Wet Black Soot Exhaust
 

If you're running too rich, do you turn the jets in or out?

Re: Wet Black Soot Exhaust
 

the idle mixture screws ... in leans them out I think. I never got it right and finally had an old t-bird guy do it. he didn't say what he did but its perfect and so I ain't even looking at them. Somebody else here knowsd way more about it than i do. I think proper timing for your setup will make a big difference too.

Re: Wet Black Soot Exhaust
 

Set with vacuum guage. Rather than type it all, I pasted this.

http://www.chevyhiperformance.com/howto/45638/

Re: Wet Black Soot Exhaust
 

Aren't the idle mixture screws strictly for what they are called? Adjusting the idle. If you are running rich I would think that means you need to change your jet size or your choke is not open all the way. ?

Re: Wet Black Soot Exhaust
 

That only affects the idle mix. ken ct.:)

Re: Wet Black Soot Exhaust
 

Right as rain 4d. ken ct.:)

Re: Wet Black Soot Exhaust
 

Water is one of the products of combustion, and is most noticeable before the engine gets to operating temperature. It is still present at operating temperature, but not as a liquid. Warmup on choke adds the carbon, thus the typical driveway mess. Use thermostats and warm it up on the road. ..B.

Re: Wet Black Soot Exhaust
 

Actually the idle circuit continues to provide fuel at low load/low throttle angle driving conditions. So a rich idle can also lead to poorer gas mileage.

Re: Wet Black Soot Exhaust
 

Don't forget, Barrs Leak and MMO will fix almost any problem on a flathead.

Re: Wet Black Soot Exhaust
 

just curious about how long you are running your engine....trips??....getting engine temp up to normal and running it that way for a while??....thanks....Mike

Re: Wet Black Soot Exhaust
 

tom b

take off aircleaner.

start engine.

look down carb and make sure

you don't see gas pouring into engine.

that's stuck float.

use a bright flashlight and safety glasses,

in case of backfire.

bye

Re: Wet Black Soot Exhaust
 

So: What is it?:confused:

Will adjusting theese screws cure fouling/Carbon on plugs?

Thanks/Christian

Re: Wet Black Soot Exhaust
 

In..! If your still fouling plugs,rebuild the carb.