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Old 07-01-2013, 03:12 PM
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Black Smoke, and tuning advice.

Let me start off by saying this is a newly built sb 355. 10.1:1 compression, edelbrock headed with a edelbrock 1406. I did the breakin of 20 minuted @ 2000 rpm, and the motor now has about 400 easy miles on it.

Problem I'm having is, on slight to moderate revs while in park there is a good amout of black smoke. I would assume its just running a tad rich. I have yet to pull any plugs. Second problem is, at a stop if you go wot it has a slight bog then takes off. I will upload a video really quick of the black smoke.
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Old 07-01-2013, 03:17 PM
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Old 07-01-2013, 04:50 PM
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running rich for sure. also may have a sticky float.
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Old 07-01-2013, 05:12 PM
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running rich for sure. also may have a sticky float.
Carb is a new unit.. I guess I need to read up on tunning the edelbrock.
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Old 07-01-2013, 05:53 PM
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there was post on here a few months ago that talked about the casting problems and metal shavings on these carbs. new out of the box problems.
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Old 07-01-2013, 06:41 PM
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there was post on here a few months ago that talked about the casting problems and metal shavings on these carbs. new out of the box problems.
Thanks killerat. I read that post if I remember correctly.

I forgot to mention I'm running 100LL for fuel. 100ll is 97 octain raiting and is "lightly leaded". I'm using it because I have a large supply (80 gallons worth).
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Old 07-02-2013, 12:13 PM
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Check fuel pressure. Too much and you will push fuel past the needles. May need to adjust the linkage for the pump. Base timing might be too low.
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Old 07-02-2013, 03:17 PM
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Check fuel pressure. Too much and you will push fuel past the needles. May need to adjust the linkage for the pump. Base timing might be too low.
Fuel pump is a holly blue @ 5psi and base timimg is set at 16. Here is a photo of a plug. All eight plugs look exactly the same. Advice on the next step would be great. Fbird if you or tech read this I would like both of your inputs on this subject.

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Old 07-02-2013, 07:45 PM
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Too much fuel. Check for clogged air filter, choke on, excessive fuel pressure, float set too high or sticky float.
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Old 07-02-2013, 08:30 PM
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Too much fuel. Check for clogged air filter, choke on, excessive fuel pressure, float set too high or sticky float.
Air filter is used but not really bad, choke is open all the way, fuel pressure is at 5psi and the carb was a new unit but has had about 250 miles put on it before it was put on this motor. Carb floats are spot on. Base timing is set at 16 and I'm runing 100LL avgas.
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Old 07-02-2013, 08:35 PM
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and I'm runing 100LL avgas.

Why?
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Old 07-02-2013, 08:41 PM
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I have a large supply of 100ll that dosent cost a dime to me. And its 97 octain fuel, Only fuel in my local area is 91.
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Old 07-02-2013, 08:45 PM
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Only fuel in my local area is 91.
And I drive an 11.9x second 1/4 mile car on 87... So why do you need 100LL??

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Old 07-02-2013, 09:01 PM
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I have a large supply of 100ll that dosent cost a dime to me.
I've got a lot of it on hand. Why not use it if its free?
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Old 07-02-2013, 09:16 PM
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If it bogs at take off and recovers without having to pump the throttle (and not backfire through the carb), then I guess you might be giving it too much shot of fuel. Looking at the plug, I think your timing is a little retarded (can see the line on the strap). Edelbrocks want all the initial timing you can give it - may have to re-curve your distributor to make it work the best. Adjust the idle mixture screws using a vacuum gauge. May also need to jet/rod down the primaries. Read the book - its helpful.
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