exhaust
- Thread starter muka
- Start date
Tune-A-Fish
BOTM LOSER Proudly Deplorable
If you have the stock pipe you will want to use it to determine the diameter of tube, length of tube to muffler and dissect to see if it has a baffle tube you might use inside the drag pipe.
All of this will keep your pipe as close to a home made performance exhaust you can make without actually taking power away... If it's loud and you haven't modified the intake and jetting "tuned" it for the increased flow... it may sound fast, but it's no faster and may even be much slower.
Her's an idea, Not how I would do it with copper, but you might be able to solder if no welder is handy. Drilling holes is not my idea of a baffle either, I would slit and louver just a few at a time until you get it where you want it and not as drastic of a reduced size pipe, maybe from 1.75 to 1.5" in the baffle.
Or just buy one of these
All of this will keep your pipe as close to a home made performance exhaust you can make without actually taking power away... If it's loud and you haven't modified the intake and jetting "tuned" it for the increased flow... it may sound fast, but it's no faster and may even be much slower.
Her's an idea, Not how I would do it with copper, but you might be able to solder if no welder is handy. Drilling holes is not my idea of a baffle either, I would slit and louver just a few at a time until you get it where you want it and not as drastic of a reduced size pipe, maybe from 1.75 to 1.5" in the baffle.
Or just buy one of these
DesmoDog
Been Around the Block
There's nothing wrong with using holes(perfs) on the tube, IMHO making louvers is a waste of time and if you push them into the tube they will only add restriction and maybe some flow noise. Sound doesn't need to be "scooped" with louvers. FWIW when automotive OEMS use louvers they push them out of the tube, not into it.
The vast majority of aftermarket systems use perfs. OEMs use perfs. The only time I'd consider using louvers is if I wasn't going to put any sort of packing around the tube (perfs can whistle if there's nothing backing them). You can use stainless steel wool to knock down the whistle but it won't cut the high frequencies as well as fiberglass would. Then again, with the small size of the outer pipe even fiberglass isn't going to do much there.
Speaking of small size, a 1.5" OD tube inside of a 1.75" OD tube means a gap of less than 1/8", that's hardly enough to do anything more than a smaller tube would do with no holes. There's a reason mufflers are big, you need volume to make a difference unless you add restiction.
All that said, the bike will be loud enough that flow noise and a slight whistle aren't likely going to be an issue, so basically... I'd just drill holes in the thing and run with it. I doubt it will whistle adn there are other ways to adress it if you don't want to use packing.
As for how to fix it and where to put it I'd put it at the outlet of the pipe and hold it in with a screw. That is if I was running drag pipes. Which I can't imagine I'd ever do.
The vast majority of aftermarket systems use perfs. OEMs use perfs. The only time I'd consider using louvers is if I wasn't going to put any sort of packing around the tube (perfs can whistle if there's nothing backing them). You can use stainless steel wool to knock down the whistle but it won't cut the high frequencies as well as fiberglass would. Then again, with the small size of the outer pipe even fiberglass isn't going to do much there.
Speaking of small size, a 1.5" OD tube inside of a 1.75" OD tube means a gap of less than 1/8", that's hardly enough to do anything more than a smaller tube would do with no holes. There's a reason mufflers are big, you need volume to make a difference unless you add restiction.
All that said, the bike will be loud enough that flow noise and a slight whistle aren't likely going to be an issue, so basically... I'd just drill holes in the thing and run with it. I doubt it will whistle adn there are other ways to adress it if you don't want to use packing.
As for how to fix it and where to put it I'd put it at the outlet of the pipe and hold it in with a screw. That is if I was running drag pipes. Which I can't imagine I'd ever do.
Tune-A-Fish
BOTM LOSER Proudly Deplorable
"restriction" is the whole idea when building a "drag pipe" baffle/scavenge/turbulence tube no one said "muffler"... and why I sad "only a few to start", but carry on. chirp chirp chirp...