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Discussion in 'Airheads' started by wirewrkr, Mar 13, 2010.
couldn't resist....... I even bid on another set.. but got beaten
out by some guy in California.
Interesting. Looks kinda lilke a cutaway of a Bose speaker. Exhaust 'tuning' is a bit of a black art, and the math is beyond me.
I do know that for each spark of the plug, there are two pressure waves exiting. One is the expanding gas, and the other is pure sound pressure, both of which move at two distinct speeds. Both of which utilize the available 'space' in different manners.
Don't forget the waves reflected from the end of the system returning as well!
I've been looking at cutaways of mufflers wherever I can find them.
I cannot quite tell the shape of the exhaust path from the front to the back. Is that a simple round tube with another sheet of steel behind it or is it a crecent-shaped tube?
THANKS for the pic.
Snowbum suggests drilling 4 holes in the flat portion right at the rear adjacent to the outlet.
Looking at the slice that would appear to give some gas a straightish path out.
Probably wouldnt free as much gas as a 1/2 inch hole in the main baffle, but it is easier to reverse if it dont work out as planned.
Was the muffler bearing already gone when you cut it open?
Yeah, they're the first thing to rust out on these models.
The older bikes had a problem with worn phinifler pins and piston pull-back springs weakening, but these later bikes only suffered from rotting muffler bearings.
I just hate seeing part names being used incorrectly It's kannidling pins and piston return springs. A weak piston return spring can lead to many hard-to-diagnose problems, including glowing generator warning lights at engine speeds above 13,000 RPM. A green bulb can improve the symptom, but does not fix the problem.
You Yankees just have a different dialect than Jersey boyz.
Just remember, Ya canna get thayuh from heyah.
My first Beemer was an R60/6 that had this modification. It definitely had a more authoritative sound than other airhead bikes I'd ride with.
Great. Snot on my monitor.. lovely.
I've seen weak piston return springs unfairly blamed for causing problems when often it's due to incorrectly adjusted fledel valves.