Gas engine exhaust extensions and back pressure

Don't know the answer- but I'm interested in it-- Be sure you keep a.h.r updated.

My instincts would be to put a tach on the machine with the old muffler and check it again when the new one is hooked up. If it is the same- forget about it.

My problem with flex-anything is that it often takes more to fasten it in place than it would take to use rigid stuff in the first place.

--especially with steel exhaust which is likely to get hot enough to start fires along it's length.

If this is going into a fixed place and won't be moved around, I'd stop at a muffler shop and see what they'd charge for a section of smooth pipe. [bent up if you dare- or with a couple 'L's]

Jim

If only it were that simple.

I think you might want to Google "exhaust scavenging". -----

- gpsman

in

The big difference in exhaust systems is the volume of air reduces rapidly with distance down the pipe as the exhaust cools off. On intake, there is no temperature differential as the propane/nat gas comes thru the pipe, but the exhaust cools rapidly so the diameter of the pipe, if constant, has varying effects on the air flow. Keep us posted on whatever you find out.