[DeTomaso] Glass Pack Mufflers

[MikeLDrew at aol.com]

In a message dated 3/4/15 17 04 51, tonydigi at optonline.net writes:


> So, what, exactly, is packed in a glass pack muffler, and where do I get 
> some?
> 

>>>Glass-pack mufflers are the most simple, crude kind of muffler there is. 
  They consist of an outer body, and an inner core of perforated tubing.   
The core is wrapped with fiberglass matting and then inserted into the outer 
body.

Traditional automotive glass-pack mufflers (such as Cherry Bomb)

http://www.autoaccessoriesgarage.com/Exhaust/Cherry-Bomb-Glass-Pack-Muffler

are cheap, and disposable.   They cannot be serviced, and in a relatively 
short amount of time, the fiberglass packing material breaks down and the 
muffler becomes nothing more than a swollen-looking straight pipe, with 
comparatively little noise attenuation.

Dirt bikes and quads rely on this same technology, except for some reason 
most of them come with mufflers that are designed to be serviced.   People 
seem to think that muffler packing only lasts 40-50 hours or so, and repacking 
dirt bike mufflers is a common thing.   Aftermarket street bike mufflers 
are supposedly good for 7000-10000 miles.   Thus, you can go to any motorcycle 
dealership or accessories store and find fiberglass muffler packing 
material for sale.

Here is a link with several representative products of the type:

http://www.motorcycle-superstore.com/motorcycle/Exhaust%20Packing

Note that most motorcycle muffler repacking kits lack sufficient material 
to pack an automotive muffler, which is much larger, so you would have to buy 
several packages.

Fiberglass packing material is cheap and basically disposable, making it 
not particularly well-suited for use in an automotive muffler that is welded 
together.   When I gutted my ANSA GTS muffler cans, replacing the complex and 
restrictive series of baffles and perforated tubing with a simple Y-shaped 
perforated tube, I chose to use stainless steel muffler packing material, 
which is substantially more expensive and has much greater longevity.   I got 
mine from Howe Racing, a major supplier for Trans-Am and circle-track 
racing.   It's not shown, but instead is referenced at the bottom of this page:

https://www.howeracing.com/p-7693-2-into-1.aspx

After spending the big bucks buying from this source, I thought about it 
and decided I probably hadn't bought enough.   I then went on Amazon and found 
this:

http://www.amazon.com/Two-Brothers-Racing-Stainless-005-10038S/dp/B000WKFNY6
/

So I bought some of that too.   I wound up using everything I had.   The 
results were quite good--my gutted exhausts are no louder than the stock setup 
even though they flow measurably better.

Here is another source I just found:

http://steelwooldirect.com/muffler-packing/

So, I have to ask, what prompts this question?   I'm interested in your 
project, whatever it might be?

Mike

-------------- next part --------------
   In a message dated 3/4/15 17 04 51, tonydigi at optonline.net writes:

     So, what, exactly, is packed in a glass pack muffler, and where do I
     get some?

   >>>Glass-pack mufflers are the most simple, crude kind of muffler there
   is.  They consist of an outer body, and an inner core of perforated
   tubing.  The core is wrapped with fiberglass matting and then inserted
   into the outer body.
   Traditional automotive glass-pack mufflers (such as Cherry Bomb)
   http://www.autoaccessoriesgarage.com/Exhaust/Cherry-Bomb-Glass-Pack-Muf
   fler
   are cheap, and disposable.  They cannot be serviced, and in a
   relatively short amount of time, the fiberglass packing material breaks
   down and the muffler becomes nothing more than a swollen-looking
   straight pipe, with comparatively little noise attenuation.
   Dirt bikes and quads rely on this same technology, except for some
   reason most of them come with mufflers that are designed to be
   serviced.  People seem to think that muffler packing only lasts 40-50
   hours or so, and repacking dirt bike mufflers is a common thing.
   Aftermarket street bike mufflers are supposedly good for 7000-10000
   miles.  Thus, you can go to any motorcycle dealership or accessories
   store and find fiberglass muffler packing material for sale.
   Here is a link with several representative products of the type:
   http://www.motorcycle-superstore.com/motorcycle/Exhaust%20Packing
   Note that most motorcycle muffler repacking kits lack sufficient
   material to pack an automotive muffler, which is much larger, so you
   would have to buy several packages.
   Fiberglass packing material is cheap and basically disposable, making
   it not particularly well-suited for use in an automotive muffler that
   is welded together.  When I gutted my ANSA GTS muffler cans, replacing
   the complex and restrictive series of baffles and perforated tubing
   with a simple Y-shaped perforated tube, I chose to use stainless steel
   muffler packing material, which is substantially more expensive and has
   much greater longevity.  I got mine from Howe Racing, a major supplier
   for Trans-Am and circle-track racing.  It's not shown, but instead is
   referenced at the bottom of this page:
   https://www.howeracing.com/p-7693-2-into-1.aspx
   After spending the big bucks buying from this source, I thought about
   it and decided I probably hadn't bought enough.  I then went on Amazon
   and found this:
   http://www.amazon.com/Two-Brothers-Racing-Stainless-005-10038S/dp/B000W
   KFNY6/
   So I bought some of that too.  I wound up using everything I had.  The
   results were quite good--my gutted exhausts are no louder than the
   stock setup even though they flow measurably better.
   Here is another source I just found:
   http://steelwooldirect.com/muffler-packing/
   So, I have to ask, what prompts this question?  I'm interested in your
   project, whatever it might be?
   Mike