[DeTomaso] Glass Pack Mufflers

Ed Mendez edducati at mac.com
Mon Mar 9 13:11:39 EDT 2015


I’ve also got Byars 180’s with Borla mufflers. You can see right through them and they sound great. I want to put straight pipes on it for driving into car shows. Just for shits and giggles. I wonder if anyone has done this?

:-)

Ed

> On Mar 5, 2015, at 19:59, Tony DiGiovanna <tonydigi at optonline.net> wrote:
> 
> I've got a set of Byars 180 deg exhaust on my Pcar.  The "mufflers" are
> constructed like a glass pack:  There a 3" inner pipe with radial holes and
> a 4" outer pipe over it.  There is no packing.  They are quite loud.  I have
> adapted a set of super-trapps to the ends for street use, which are
> removable for track days.  I'm just wondering what packing them would do.
> Thanks for the incredibly-thorough answer.  It was exactly what I had hoped
> for.  Not sure if I'm going act on any of it at the moment...I'm still
> putting the whole car back together first.
> 
> -----Original Message-----
> From: DeTomaso [mailto:detomaso-bounces at poca.com] On Behalf Of Mike Drew via
> DeTomaso
> Sent: Wednesday, March 04, 2015 9:34 PM
> To: tonydigi at optonline.net; detomaso at poca.com
> Subject: Re: [DeTomaso] Glass Pack Mufflers
> 
> 
> 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
> 
> 
> 
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