Variable Restrictiveness Exhaust

[BUTLER, Tom]

I saw an exhaust diverter valve in the J C Whitney catalog which will allow
you to do just what you are suggesting.  The device is controlled by a
mechanical cable.
Tom Butler

> -----Original Message-----
> From:	William T Wilson [SMTP:fluffy at snurgle.org]
> Sent:	Thursday, May 13, 1999 3:41 PM
> To:	diy_efi at efi332.eng.ohio-state.edu
> Subject:	Variable Restrictiveness Exhaust
> 
> Okay, this seems to be the best place to talk about random, goofy car mods
> that just might work. :}
> 
> Suppose I have a car that I want to pass emissions, but I also want it to
> gogood.  Why couldn't I make some sort of cat-bypass system which would
> allow the exhaust to flow openly at high revs, but flow through the cat at
> more "normal" RPM?  Maybe a solenoid-activated valve attached to the tach,
> or perhaps just a flap on a spring like at the top of a big-diesel
> smokestack.