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Deceleration popping at exhaust with new MSA Premium exhaust


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I would disengage the clutch if really popping but that's no way to drive. But then I wouldn't put up with snapping and popping in the first place... had that with dual straight Walker Continentals on my 340 Dart. The more open and straight through the less the sound is attenuated. Today I would rather have a lower rumble sound. I have a 2 1/4 inch muffler on a 1 7/8 pipe. It just dumps out and down. Still has the stock resonator. It's slightly larger than the original muffler and has a different tone. I can still hear soft 'popping' sounds. Burrrrrrrrrrrrrrrr..... bum... bum...bum...bum

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This is how i always adjust the 3 screws roundtop su carbs after setting my time to 14btdc:

 

Remove the air filter

 

Set the fuel mixture knobs at 2.5 turns clockwise

 

Set the idle speed on both carbs at 1000rpm using the unisys tool

 

Use the fast idle screw to 2000 rpm to verify the balance amongst both carbs

 

Drive the car and it if lacks power i increase the fuel mixture knob one more turn. Right now i have dialed them both to 3.5 turns.

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  • 3 weeks later...

Silicone isn't recommended for use on exhaust manifolds. They say it's only good to 650F. A car's manifold can easily get twice this but over 650 is normal. Use dry gaskets specifically the meta-lized ones made for high heat.

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  • 2 weeks later...

Resonators are designed to tune out objectionable exhaust noise through a specific range to complement the muffler used. Like getting rid of an annoying drone at cruising sped. I don't think this will help popping much. For that you need a muffler that better absorbs it.

 

Did you try turning the idle speed up slightly?

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