got my new motor running today.. when i was reving it up a bit the muffler had a terrible cackle to it.. it did before to an extent and i lived with it but now i am starting to wondering i cant stand that!!! does anyone know how to get rid of that cakcle?? so if i cant figure it out i am selling it!! and going with true duals..

 

You have a cat? probably normal to do loss of backpressure.

 

nope no cat..never had one lol cut it out as soon as i got home with the car.. i am still comptimplayting(SP) if i want to go with true duals or not.. if i do.. not saying i am but if i do do i have to run a cross over pipe or can i just run two pipes back??

 

I'd get an X or H pipe, No4N has an H I believe, that will improve performance.

 

I doubt the crackling is from the muffler. You probably just hear it more now than you did before, so it increased the noticability of the symptom but didn't actually make the problem itself worse.

As far as I know the sound is caused by unburnt fuel being sucked through the system and igniting when it hits hot spots in the pipes. Cats make this less noticable because they burn it up plus dampen sound. Mike's LeMans (Camrs89) crackels and pops like hell... and he's got true duals with glasspacks. But its also running kinda rich, which would explain the extra fuel getting into the pipes.

 

NO4N is that acompany or a person on the board?? thanks and proabably you are right from the carb being to rich right now it might be making that crackling noise.. ill get it worked out but i have wanted to go duals for a while now so we will see

 

Oh yeah, don't get me wrong, tru duals is way cool if you can pull it off.

 

cackling?

could that be the sound of rotted baffles in the muffler?
what muff you got on her?

 

i have the hooker cat back system on it.. ive had it for less then a year.. hoped it woudlnt be something like worn out baffles but who knows.. if it is hooker will get a nice big letter and probably there muffler through a plate glass window

 

No4NJunk, member on the boards.

 

Yeah, my LeMans as Dave stated, crackles when you let off the gas. Its cause I have a extremly worked q-jet on there that is a little much for the engine. Oh well, it will work just fine when the 455 gets dropped in.

 

Someday.

 

yes, someday...I cant wait till then though. Paintence is the key.

 

I had the same problem that you ha dood. I thought I was running rich which i still might be. But what I did was take teh smog pump off and threw it on teh garage floor, turned the car back on revved that SOB and no more backfire or crackling. Try that. Taking off the smog pump only does more good than bad, unless you have emmissions testing. I plan to bolt it back on fo remmissions testing just in case.

 

I've had the same thing two different times. The first time I was running too rich, the second was an exhaust leak where the manifold bolts to the head.