Diagnosing Exhaust Sound

[Dan The Man]

69 Charger 440. Finally got the beast running, but I don't like the "motor boat" sound coming from the exhaust https://app.photobucket.com/u/stump...941f16/p/fdc4576c-e08d-4004-b8e4-7f9c90e01cf1. The entire exhaust is "new" as in never exposed to the elements and always garaged since installed new. The heat riser is just loosey goosey, but I have it tied off counter clockwise to always be open. I just starting using Rec 90 ethanol free gas. Still tuning the carb since I rebuilt it so haven't road tested yet. What do you think?

 

[Johnpat]

Sounds like a lot of misfiring to me.
What happens when you increase RPM??

 

[Dan The Man]

Sounds like a lot of misfiring to me.
What happens when you increase RPM??

Erractic. I pulled the #1 plug and it is blacked out. I would say oil fouled.

 

[dadsbee]

Check your plug wire order..

 

[Dan The Man]

Check your plug wire order..

Yea its good

 

[pnora]

Sounds like its very lean.

 

[Dan The Man]

Sounds like its very lean.

I'm getting 16 manifold vacuum. Changing plugs. Needed it anyway.

 

[R413]

Sound like the idle circuit in the carb is plugged up.

Idling to slow. To lean. Richen the mix.

 

[Dan The Man]

Sound like the idle circuit in the carb is plugged up.

Idling to slow. To lean. Richen the mix.

OK changed out the plugs. Forgot what a PITA they are. Idle circuit plugged? I just rebuilt the card, so where should I be looking exactly?

 

[1967coronet]

What carburetor are you working with ?

 

[toolmanmike]

Timing will do that. What's your initial set at?

 

[moparedtn]

Sounds fine - for a slant six!
No way that's hitting on all 8 right now.

 

[Dan The Man]

What carburetor are you working with ?

Eddy 1411 750cfm

 

[Dan The Man]

Timing will do that. What's your initial set at?

Trying to determine that now. What is a good initial?

 

[toolmanmike]

Trying to determine that now. What is a good initial?

I start with 10° BTDC and advance from there.

 

[1967coronet]

Edelbrock 750 , your 2 air ,idle needles at the front take them out and spray some carb cleaner down each hole.
Screw them back in easy till the bottom out. Then back out 2 turns.
That should give you a good start point.
Like posted set timing 10 degree advance to start with.
Dbl. Ck plugs for fouling, plug wire condition and fire order like posted.
Bad distributor cap / rotor possible.
I've found cracked ( new ) plugs in the box before.
Just be methodical and test fire thr car after each change you make.

 

[Dan The Man]

Edelbrock 750 , your 2 air ,idle needles at the front take them out and spray some carb cleaner down each hole.
Screw them back in easy till the bottom out. Then back out 2 turns.
That should give you a good start point.
Like posted set timing 10 degree advance to start with.
Dbl. Ck plugs for fouling, plug wire condition and fire order like posted.
Bad distributor cap / rotor possible.
I've found cracked ( new ) plugs in the box before.
Just be methodical and test fire thr car after each change you make.

OK Cleaned the air/fuel mixture screw holes and adjusted as stated. Ckd timing and it was already at 10. Plugs and wires are new. Cap and rotor fine. I even adjusted the air gap between the reluctor and the pu. It was more than 008. Starts right up. Idles ok but when I gas it from the carb, I get a back fire. Coil?? I've mentioned several times that I now use Rec 90 ethanol free gas for the first time ever. Could this be my friggin problem? It's very frustrating because this car ran awesome before it sat for 5 years. Although garaged and never exposed to the elements.

 

[khryslerkid]

Double check your firing order. Easy to cross two.

 

[Dan The Man]

Double check your firing order. Easy to cross two.

I did. Several times. It's even listed on the intake. Counter clockwise.

 

[Dan The Man]

I did. Several times. It's even listed on the intake. Counter clockwise.

Also, I have an electric choke, and the hot side is only getting 8.9 volts??