Re: [alfa] Resonator replacement ideas

[Jon Pike <jhpike@xxxxxxx>]

Hmmm..  my thought on a front resonator rather than a straight pipe was 
a bit of "cavity" might put a deeper/mellower tone in the note,  don't 
know if it might provide better or different functioning of the 
header/downpipe system.  More interested in that than muffling there..  
If I could get an empty box I'd prefer that,  I was thinking of a short 
glass pack more for it's larger than straight pipe diameter...

Wonder if anyone has gotten psycho enough on this subject to analyze 
exhaust note,  calculate muffler cavity frequencies and build a tuned 
system to emphasise freqency response for a fine, rounded, musical tone?

It *COULD* be done...

Guess I've been hanging around the DIY Speaker builder forums too 
much..  ;-)

Jon
77 Spider

Jeff Greenfield wrote:


> Jon - 
> If you fit the early style 4 into 2 headers to a later car, all you need to
> do is use the corresponding front pipe, which will then bolt up to the
> standard front muffler. The early front pipe, has a resonator approx. where
> the Cat is now on your car.
>
> Of course doing this eliminates the cat, so this set up would have to be
> reserved for um-uh track events and other sorts of off road use, right?
>
> The series 4 cars, went back to a 4 into 2 header, with a front pipe that
> incorporates a cat. I don't know if you could use the series 4 front
> pipe/cat with the early headers, but I somehow suspect you could. Anyone
> know for sure?
>
> The front resonator, does not really have that much influence on the sound,
> as I've heard a few cars that had them replaced with straight pipes by
> quickie muffler shops that didn't know any better. I've heard though, that
> not having it does hurt performance some.
>
> Bigger changes in the sound, can be made by eliminating one of the mufflers,
> and/or replacing one or both with glass packs. There has been much
> discussion of this here lately.
>
> HTH,
>
> Jeff
>
> -----Original Message-----
>
> (snip)
>
> Early cars had a kind of  box that I was under the impression, was more 
> a resonator than muffler..  though I think I saw one cut open once, 
> about half cavity half muffler like damping.  Anyone have experiences 
> with using straight pipes, or small glasspack things there,  and how did 
> it influence the sound?
>
> That, and a cheap source of a few flanges,  and I'll be set for several 
> kinds of motoring..
>
> Jon
> 77 Spider
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