Exhausting research (and looking for a small part)

[fahrvegnugen at cox.net (David Utley)]

Gordon,
  Did you put anything in the cat after you hollowed it out?  I have had an empty cat on my car before, and it 'dinged'.  Ding-da-ding, dadaladingding, etc...  

I am interested in this, as mine is a bit too noisy now...

David
> 
> From: Gordon Forbess <gforbess@attglobal.net>
> Date: 2004/10/14 Thu PM 07:03:25 EDT
> To: "C Boyko" <roccit_53@scirocco.cs.uoguelph.ca>
> CC: scirocco-l@scirocco.org
> Subject: Re: Exhausting research (and looking for a small part)
> 
> On Thu, 14 Oct 2004 17:50:47 -0400 (EDT), "C Boyko"
> <roccit_53@scirocco.cs.uoguelph.ca> wrote:
> 
> >I love you.... oh did I say that out loud?
> 
> Blush! (I'm glad wifey doesn't read this list)
> 
> >I'm just about to finally get a
> >decent particulate mask to do the same thing, and I was afraid of what it
> >would sound like
> 
> I remembered it was always quieter with the cat, but thought it was
> the restriction of the element and diffuser that did it.  The
> motorcycle site (didn't bookmark it) said that the key to a quieter
> exhaust is to smooth out the pulses of the cylinders firing, probably
> more critical on your typical 2 banger bike than our 4s, and an
> expansion chamber does exactly that.  I also figured that a wide spot
> in the exhaust pipe couldn't hurt the flow, and the APPEARANCE of the
> installed cat gives me a great deal of comfort.  I'm not subject to
> testing, but the check pipe is a dead giveaway that's too easily seen
> if somebody gets picky.
> 
> Anyway, good luck.  Let us know if it works for you.
> 
> 
> 
> Gordon
> 
> 75 Mk I/Drake 1.9
> http://pws.prserv.net/gforbess/scirocco/scirocco.htm
> 
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