Just made my own silencer .......3 pounds lighter
Posted August 31, 2004 - 06:55 PM
1 1/2 lbs. I used this as a start for my own muffler. I took some thin sheet aluminum from an old dish washer I had junked and used it to make the can. It is fairly thin and would take a couple spills on the bike. Hard crashes would ding it pretty good, though. Anyway, using the Q mid pipe,
I wraped the sheet aluminum around the flange and drilled holes to match up with the midpipe holes. Then I took the spark arretser and slid it in the other end and wraped the aluminum around it. This gave me the oval shape. I took what was left of the original packing and wraped it around the tube with holes in it, inside the can. So basically it is a straight through exhaust. To seal the can, I overlaped it on the back side, ran a generous bead of hightemp rtv, and used sheet metal screws every 2" to close it up. The final weight was 3 lbs!!!! If I redo it with a titanium mid pipe, I think I could shave off another 3/4 pound for sure.
So now my whole exhaust is 3 1/2 pounds, total. I was thinking that power-wise might not work too well ( I was just kinda fooling around building this just to experiment).
So, I fire up the bike. Whoa! It sounds pretty deep. Has a real good sound to it. It's loud, but not nearly as loud as I thought it would be. It only has half of the packing in it, so it should be even quieter when I repack it. Oh the length of my new silencer is 14". So now for the ride.
I take it up the street. It definately revs quicker than the Q. But the Q purposly slows the revs to help with off road traction. It has NOTICEABLY more over-all power than the Q. I was suprised. So I don't think I screwed up too bad. I'm really curious to put it on a dyno and compare the difference thoughout the powerband. I't would be cool if I could try several different designs and gage the gains and loses. Anyway, I'm gonna redo it a little nicer and loose another 3/4 lb off the mid pipe. For me its a keeper!
(until I smash it crashing, and then I 'll build another)
It cost $0 for me to make this scrounging up parts. I'm sure there is a lot more to making an exhaust that I am missing, but I'm going to dyno it and if it performs well, I might make a few of them and sell cheap to freinds. Less than $100.
Posted August 31, 2004 - 07:10 PM
Posted August 31, 2004 - 07:53 PM
(Well, next to rotational mass ). My WR 450 is now so far from being top heavy it's a joke. Feels like a 250 2 smoke. Now....what else can I modify??..............
Posted August 31, 2004 - 08:00 PM
This may sound stupid, but I also trimmed off alot of the fenders under the seat and also the rear part of the front fender. All the fender trimming saved me about 1 1/2 lbs weight. It's all adding up pretty quick.
Posted August 31, 2004 - 08:15 PM
I personally like the looks of side panels so I vote you replace them.
Posted August 31, 2004 - 08:22 PM
Posted August 31, 2004 - 09:05 PM
Posted August 31, 2004 - 10:15 PM
Posted August 31, 2004 - 11:44 PM
Posted September 01, 2004 - 08:19 AM
I have to say I started out just kinda messing around being
stupid on purpose trying to build one. I figured it would be really loud and obnoxious and people would be like,
"What in the hell is that?!" But I suprised myself, and it actually works really well. Now to the Dyno..........
Posted September 02, 2004 - 03:30 PM