Re: Catalytic Convert Replacement

On Mon, 18 Aug 2008 10:35:43 -0500, Mike Dobony wrote:

> On Fri, 15 Aug 2008 16:11:09 -0400, Shep wrote:
> 
>> The difference is like running one cat on a dual exhaust engine and no
>> cat on the other, the slight difference in back pressure, will not
>> cause a vibration, if this is what you mean.
> 
> 
> Yes it will.  One bank with significant resistance followed by another
> bank with little resistance will cause vibration.  With no cat there
> will definitely be vibration.  With mismatched cats there will be
> vibration. That is simple fluid dynamics.  The question is will the
> difference in styles and sizes of cats make enough of a vibration to
> significantly affect long term engine wear.  Since you reject basic
> science your answer is totally invalid.  Go back to science class and
> study basic fluid dynamics. Racers understand this and that is why they
> go to great lengths to balance flow in intakes and exhaust, especially
> in those high revving grand prix racers.

Well now, you have answered your own question haven't you?