Mufflers, another scam item

["Bruce Hevner" <scramblr@xxxxxxxxxxx>]

>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? 

That sounds reasonable till you remember,,, exhaust ports on heads are
tested with a steady stream on a flow bench. And since the muffler is
handling several cylinders flowing together it would stand to reason that
effect would be reduced. I would think that would also reduce the effect of
the SuperTrapp muffler mentioned. And as a matter of fact they are mostly
seen on cycles with 1 or 2 cylinder engines.

 In the magazine article they just used a LARGE capacity flow bench since
most mufflers flow a LOT of air!

I used a DynoMax muffler on the DOHC Toyota street truck I had back in the
80's. 1st one lasted about 10k then started rattling, the baffles had broken
loose. They replaced it but the second one did the same thing! I would go
with a "welded" muffler (which is what I'm using now) just because they last
longer. Summit has a brand of their own now and as mentioned you can get the
OLD (VERY NOISY)  Flowmaster 40 on eBay at a good price. I think next time
I'll try one of the Summit jobs
But hey,,, that's just me!

Bruce Hevner