Andrew,
I hardly have time to put my car back together on account of work hours,
never mind experiments. What I bought is the muffler shown in the Moss catalog
as a stock, original type muffler. So, from the replies I've been getting, all
if not most mufflers are constructed basically the same. The sound level is
determined by the size of your muffler (diameter and length) and how many holes
and what size holes are drilled inside.
Mike MacLean-60 Sprite
Andrew.Griffith@ReadRite.com wrote:
> Mike,
> It sounds as if you bought a glass or steel-pack, very good choice.
> The theory behind how a glass-pack works is very simple...
>
> The exhaust gas flows pretty much straight down the line or exhaust pipe
> through the pack and out the end with very little restriction... which is
> good. Meanwhile the sound waves bounce back and forth down the pipe. In side
> the glass-pack the pipe is cross-drilled with a bunch of holes that are of a
> specific diameter and spacing that matches the range of sound frequencies.
> The sound waves bounce out through the holes into an area filled with sound
> absorbing material, like steel wool or fiber-glass. The material transforms
> the energy from the sound waves into vibrations, while causing very little
> restriction of the gases. And the reason that a glass-packs get louder when
> you get it on, so to speak, is that there is more sound waves then holes.
>
> Theoretically you can cross drill the entire length of your exhaust pipe,
> wrap it w/ steel wool or fiber-glass insulation and you will have a very
> quite and low restriction exhaust system.
>
> If you have the time and insulation... why don't you give it a try and tell
> us how it works out?
> Just joking,
>
> -Drew
>
>
> -----Original Message-----
> From: Mike Maclean [mailto:macleans@earthlink.net]
> Sent: Friday, November 19, 1999 10:11 AM
> To: Justin Cook
> Cc: spridgets@autox.team.net
> Subject: Re: my muffler experience
>
> Justin,
> I bought a stock muffler for my Bugeye from Moss and I can see
> straight thru it. There is a tubular screened section in the can
> section of the thing. Do gasses expand there causing the muffling
> effect? I wonder how this is going to sound.
> Mike MacLean-60 Sprite
>
> Justin Cook wrote:
>
> > I had a 'turbo tube' installed and I replaced with a
> > stock (Mo$$) glasspack after about a month. The tube
> > sounded great but really resonated inside the car.
> > The stock (its made by Walker) muffler eliminates
> > interior resonance. It's got a somewhat odd note but
> > OK for me.
> >
> > After switching to stock muffler I looked in the
> > turbo tube and saw a small (1/4 inch) hole where there
> > probably shouldn't have been one -- I could see
> > straight through the thing! Maybe that's why the tube
> > made my ears hurt after hard driving.
> >
> > Personal note: after seeing my grandfather and father
> > both half-deaf from war and farm equipment I am very
> > protective of my ears. I'll give up a couple of hp if
> > necessary.
> >
> > --- Andy Webster <trunkie@hotmail.com> wrote:
> > > Thanks for the quick response...
> > > how long is each glasspack?
> > > I noticed at the shop, they had various lengths.
> > > He also had a thing he called a 'turbo tube' that
> > > was about 2&1/2'-3' in
> > > length, that looked like it would do a good job. No
> > > baffles, interior
> > > similar to the hot dogs.
> > > So do you get a nice note from yours? What engine
> > > and stage of tune do you
> > > run?
> > > Andy
> > >
> > >
> > > >From: "Elliott, Patrick"
> > > <patrick.elliott@attws.com>
> > > >To: "'Andy Webster'" <trunkie@hotmail.com>
> > > >CC: "'Spridgets'" <spridgets@autox.team.net>
> > > >Subject: RE: muffler Q's
> > > >Date: Wed, 17 Nov 1999 07:17:29 -0800
> > > >
> > > > I think it'll sound good. but glass packs vary in
> > > noise suppression from
> > > >manufacture to manufacture. I have the same set up
> > > as your talking about,
> > > >but ended up with two glass packs (inline). In
> > > effect doubling the length
> > > >of
> > > >the muffler.
> > > >One was just way too loud.
> > > >
> > > >
> > > >
> > > >-----Original Message-----
> > > >From: Andy Webster [mailto:trunkie@hotmail.com]
> > > >Sent: Wednesday, November 17, 1999 6:51 AM
> > > >To: spridgets@autox.team.net
> > > >Subject: muffler Q's
> > > >
> > > >
> > > >greetings exhaust gurus and everyone else,
> > > >The LCB header I'm about to install has a 1&3/4"
> > > outlet. I plan to run it
> > > >into a 1&3/4" pipe and have a straight through
> > > glasspack (the ex.shop guy
> > > >called it a 'hot dog') of 1&3/4"I.D in there too.
> > > >Can anyone give me a clue as to whether:
> > > >It will sound good?
> > > >It will still be loud but not LOUD!?
> > > >this is a good combination for performance...low
> > > back pressure etc.
> > > >Andy
> > > >
> > >
> > >
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