Re: Re[2]: Gibson exhaust installation

From: Nicholas McKinney (nickmckinn@mindspring.com)
Date: Tue Feb 24 1998 - 21:57:43 EST


At 08:50 PM 2/23/98 EST, you wrote:
>In a message dated 98-02-21 01:05:25 EST, you write:
>
><< This has never been my observation. The only time that lower backpressure
> hurts a motor is when the intake system cannot compensate and runs too
> lean, or when the engine EGR is designed with an extreme amount of
> backpressure. Both of these situations could be adjusted for.
>
> However running larger pipes than neccessary does lower the available
> scavenging, if any could be done in the first place. >>
>
>What about with Catalytic converters ? To my thiunking the Cat has got to be
>the bottle neck ? So how can bigger pipes past it hurt performance ??

Hello Bill,

Well if the cat is creating a bottleneck, how can you have any scavenging
after the break point where we see a pressure difference on opposite sides
of the cat?

To be honest I have never dealt with a performance car that had over large
catbacks and stifling cats. I do not plan to learn what happens when I
start playing with my Dakota's exhaust either.

Regards

Nicholas



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