I have a "turbo-pack" muffler that's shaped like a glasspack, with internals of a turbo. It has an internal baffle welded in at each end, giving 2 small end chambers, and one large middle chamber. The baffles have a 6" long pipe going through them that is only 1.5" diameter. (This muffler is similiar to the Hushpower, Sweettalker, and Heartthrob.)

This seems to be very restrictive to me, since the exhaust gases are going from a 2.5" pipe into a muffler that reduces the flow to 1.5". Apparently the muffler designers know what they're doing, but it seems they could have made the interior pipes larger. Any thoughts on this?

I'm considering drilling extra holes through the baffles to lessen the restriction, unless there's some principle making the small pipes necessary...??? Thanks in advance for any ideas.

 

Try the muffler before you do that, for some reason they work, If a 351M with dual 2" exaust can gain a bit of power from them then I am thinking they work. If they seem too restrictive then pull 'em and drill 'em out. But try them first.

 

351M, thanks for the reply, I'll do that. I figure there's some principle that accellerates the exhaust gases through those small pipes. I have no experience with the turbo/pack type mufflers, so it's good to hear that they do work.

 

If it really is 1.5", I would throw that muffler away. Having that small an opening will not be good for flow. Making new holes might mess up the way the muffler is made to flow and make things worse, making the gasses swirl around in the muffler instead of passing through.

 

Good lord. 2 1/2 inch should be 2 1/2 inch! Dump those and get Magnaflows or Dynomax Super Turbos or Race Magnums. You need flow!

 

Guys, I agree that it dosen't sound logical to have 2.5" diameter pipe flowing through 1.5" muffler innards. But neither does it sound logical that the muffler would be designed this way without a reason. There's plenty of room for bigger pipes inside the muffler housing, and it's not a cheaply built muffler. There's a large center chamber that allows for gas expansion; maybe that creates a low pressure area that "extracts" the gas through the smaller pipe.......???

I'm going to clamp it on the Bronco tomorrow, and see if it'll move out of it's own tracks.........

 

Yea, somehow them mufflers work, from my experience they are quieter as duals then as singles. Like the 351 and my Lada that had them, they were quieter then my 2.8 chev with one. The 2.8 sounded like it had a glasspack.

 

Well yeah there designed that way for a reason. There quiet. and there restritive at the same time. it all makes sense.

 

Well, I tried the turbo-pack and it IS restrictive, at least compared to the Thrush turbo that it replaced. I still have the stock single exhaust on the Bronco, so it was easy to compare. After clamping it on, I blipped the throttle and the engine didn't rev as crisply as before. It sounded good though; relatively quiet with a nice low pitched tone.

Maybe I can still salvage it. I'm going to try drilling holes in the end plates to give better flow. That'll also make it louder, don't know what it'll do to the tone.....

 

So a wee bit restrictive on you're app, are the inlet and outlet angled? if its a straight one that will make a diff too, the angled muffs point the pipes toward the flow tubes. I have never tried drilling into one though. I have cut them apart and you should get away with drilling a few 5/16" holes mabey?

 

[QUOTE=thelonerangerxlt] There's a large center chamber that allows for gas expansion; QUOTE]

Doesnt matter how big the inside is. It still can only flow through the small openings at either end.