Re: More on mufflers

[farna@xxxxxxx]

I like Tom's other idea. Setup a typical SBC with a 2" head pipe then attach a muffler with say 3' of 2" straight pipe, a typical over axle bend, then another foot of pipe. Measure the flow at cruising speed (2500-3000 rpm) and at high speed (say 5K). Test as many as possible, cheap and expensive, publish the results. To make it even better, send the manufacturers a letter and ask them to submit their products first! I wonder how many would be willing to put their product up for an equal comaprison to the competition? 

On May 17, 2005 Dave Crooks wrote:

> >When one tests mufflers, can you be sure that
>  >the flow with hot, pulsing exhaust gas will be
>  >the same as a cool, steady flow of air? Or at
>  >least comparable from one muffler to another?
> 
> No it isn't the same, but at least it gives
> you a point of reference.  The exact same
> question could be asked of Cylinder head flow
> testing (but rarely is!).  The question is
> even more relevant with headers.  The whole
> idea behind equal length tube headers is to
> keep the pulses of each cylinder spread out,
> and not allowing two to crowd into the same
> pipe at the same time.  Static flow testing
> will never show this.  It will also never show
> the true difference between shorties and long
> tube headers.  And what's true of the exhaust
> is equally true of the intake manifold ports.
> 
> On the other hand, there is no black magic here.
> Given some time and computer horsepower it can
> all be simulated, although it's sometimes faster,
> easier and cheaper to build it and measure!
> 
> As always, YMMV!
> Cheers,
> 
> 
> Dave
> 
> 
> 
> .


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