Black smoke under hard acceleration - Team Camaro Tech
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post #1 of 15 (permalink) Old Jun 17th, 15, 09:23 PM Thread Starter
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Black smoke under hard acceleration

Coming back from the car show today my friend was behind me at a stop. I ran wot to the top of 3rd gear. When we got back to my place my friend told me when I launched I had black smoke dump out of my exhaust. He said it only did it on the launch. I did a tune up a couple months ago with new plugs and rebuild the carb (Holley 600 4 bbl) while I had the plugs out I did a compression test all 8 cylinders were 148~150 the old plugs were not black, white or had any signs of bad burn. Put new plugs in. Re did the timing bc my carb had a vacuum leak. It's at 33* total. Engine is a 327 with stock heads, edlbrock intake, hei, mild cam. Mild engine. Vacuum is a 15hg steady. The car runs great, idles smooth. I have a m20 4 speed with 12 bolt rear, 3:31 gears with posi. I do have a slight chatter when starting from a stop (guessing my cam is not matched with the gear ratio??) my question is, is the black smoke under hard acceleration an issue? I believe it's a rich condition which could be fix by leaning it out a touch but otherwise the car runs great! And the plugs show it. Should I tune accordingly? and how would you recommend to?
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post #2 of 15 (permalink) Old Jun 17th, 15, 09:28 PM
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Re: Black smoke under hard acceleration

Sure it wasn't just dumping carbon from the exhaust system? Usually a second pass back to back at WOT reveals no carbon left, so no smoke screen.


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post #3 of 15 (permalink) Old Jun 17th, 15, 09:32 PM Thread Starter
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That very well could be it, he did say it looked like black smoke dust. I really don't dump the pedal and run wot. Just cruise around mainly, sometimes I'll give her some gas but it's not a wot throttle like today.
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post #4 of 15 (permalink) Old Jun 17th, 15, 09:47 PM
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Re: Black smoke under hard acceleration

Try some smaller accelerator pump squirter nozzles. Your Air/Fuel ratio is rich on hard acceleration. Smaller squirters should clean that up and make it run even harder.

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post #5 of 15 (permalink) Old Jun 17th, 15, 10:00 PM Thread Starter
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I'll have to see what size the nozzle is on it now. One step smaller you think? I'm going to try a couple more wot runs one after another to see if it's just carbon in my exhaust before I try out the nozzle swap.

Last edited by Nhurt; Jun 17th, 15 at 10:01 PM.
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post #6 of 15 (permalink) Old Jun 18th, 15, 09:00 AM
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Re: Black smoke under hard acceleration

Don't mess with it if it is running well, likely it is just [email protected] in the exhaust.
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post #7 of 15 (permalink) Old Jun 18th, 15, 09:05 AM Thread Starter
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Thanks!
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post #8 of 15 (permalink) Old Jun 18th, 15, 09:42 AM
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Re: Black smoke under hard acceleration

You can try going one step smaller.

Here's what I'd do: Read the plugs.

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post #9 of 15 (permalink) Old Jun 18th, 15, 12:14 PM
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Re: Black smoke under hard acceleration

Yep, don't mess with it.

One owner 69 Camaro,(yep, bought it new
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RS SS Hugger Orange, L88, 4:10's tru-tack posi, ducted hood, Endura, spoilers.
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128.79mph 1.428 60'
All with 1960's stuff. (except tires and converter)
+ MT Super Scavenger headers & 3" full exhaust with X pipe. 3700 lbs. with me in it.
1000cfm AED and HD Harold-Lunati SR, 725 lift with shaft rockers too.
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post #10 of 15 (permalink) Old Jun 19th, 15, 09:10 AM Thread Starter
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The plugs look great. I'm not going to mess with it, it runs great and probably just carbon that puked out from the exhaust when I dumped it.
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post #11 of 15 (permalink) Old Jun 19th, 15, 06:56 PM
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Re: Black smoke under hard acceleration

Quote:
Originally Posted by Nhurt View Post
The plugs look great. I'm not going to mess with it, it runs great and probably just carbon that puked out from the exhaust when I dumped it.
yup and you know what that means..... You don't step on it enough!
When in New York we called it an Italian tuneup(please no one take offense geeeeze).
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post #12 of 15 (permalink) Old Jun 19th, 15, 08:39 PM Thread Starter
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Hahahahahahah
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post #13 of 15 (permalink) Old Jun 19th, 15, 09:01 PM
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Re: Black smoke under hard acceleration

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Originally Posted by Nhurt View Post
Hahahahahahah
x2
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post #14 of 15 (permalink) Old Jun 21st, 15, 12:29 PM
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Re: Black smoke under hard acceleration

Quote:
Originally Posted by 67sc View Post
x2
So that's where that came from, New York. I thought it was from my neighborhood. Oh wait. I was in New York once too. It was 67 years ago.

One owner 69 Camaro,(yep, bought it new
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)
RS SS Hugger Orange, L88, 4:10's tru-tack posi, ducted hood, Endura, spoilers.
TH400 (CX) with Coan 8" converter, GV-OD, 8 track still on console and best et 10.495,
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
128.79mph 1.428 60'
All with 1960's stuff. (except tires and converter)
+ MT Super Scavenger headers & 3" full exhaust with X pipe. 3700 lbs. with me in it.
1000cfm AED and HD Harold-Lunati SR, 725 lift with shaft rockers too.
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post #15 of 15 (permalink) Old Jun 21st, 15, 01:55 PM
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Re: Black smoke under hard acceleration

Since it's "make fun of Italians day" :

The Italian Tomato Garden

An old Italian man lived alone in the country. It was Spring and he wanted to dig his tomato garden, as he had done every year, but it was very hard work for the aging man as the ground was hard. His only son, Vincent, who used to help him, was currently in prison. The old man wrote a letter to his son and described his predicament:

Dear Vincent,
I am feeling pretty bad because it looks like I won't be able to plant my tomato garden this year. I'm just getting too old to be digging up a garden plot. If only you were here my troubles would be over. I know you would dig the plot for me.

Love Dad

A few days later he received a letter from his son:

Dear Dad,
Not for nothing, but don't dig up that garden. That's where I buried the BODIES.
Love,
Vinnie

At 4 a.m. the next morning, FBI agents and local police arrived at the old man's house and dug up the entire area. However, they didn't find any bodies, so they apologized to the old man and left.

That same day the old man received another letter from his son.

Dear Dad,
Go ahead and plant the tomatoes now. That's the best I could do under the circumstances.

Love,
Vinnie

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