[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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