docc Posted March 23, 2014 Share Posted March 23, 2014 WOW, Bjorn! That is sweeet! Can't wait to see it all together! Link to comment Share on other sites More sharing options...
68C Posted March 23, 2014 Share Posted March 23, 2014 I wish I had listened to my welding instructor, a thing of beauty. Link to comment Share on other sites More sharing options...
Bjorn Posted March 25, 2014 Author Share Posted March 25, 2014 So the final part between the collector and muffler is taking it final shape. Only need to add a support to the collector to level it out and a clamping band. Hope to build the rest this weekend Link to comment Share on other sites More sharing options...
Bjorn Posted March 31, 2014 Author Share Posted March 31, 2014 The whole exhaust is a ''joint venture'' between my little brother and me. He did most of the welding, as he is a welder. This weekend we finished most of the pipes. Only need to fine tune things like the mounting points next weekend, cant wait to try them Ill post more pictures of the centrestand and fixations next time. 1 Link to comment Share on other sites More sharing options...
sp838 Posted March 31, 2014 Share Posted March 31, 2014 Awesome job! Is the muffler welded to the end of the pipe, or did you make it removable? Link to comment Share on other sites More sharing options...
Bjorn Posted April 1, 2014 Author Share Posted April 1, 2014 Yes its welded, however in theory you can remove the muffler. Its hold to the pipe by means of springs. I do know that its very tight and hard to remove. Removing the exhaust is quite easy though, its a lot lighter than the original set-up. Link to comment Share on other sites More sharing options...
emry Posted April 1, 2014 Share Posted April 1, 2014 Nice, i wish you lived in my neighborhood. You clearly have more energy than me. Link to comment Share on other sites More sharing options...
docc Posted April 2, 2014 Share Posted April 2, 2014 . . . I'm not that old (23) . . . Methinks that is the critical energy statistic right there. Link to comment Share on other sites More sharing options...
Admin Jaap Posted April 2, 2014 Share Posted April 2, 2014 Nice! Link to comment Share on other sites More sharing options...
68C Posted April 2, 2014 Share Posted April 2, 2014 So what did little brother use gas, mig or tig? Link to comment Share on other sites More sharing options...
Bjorn Posted April 2, 2014 Author Share Posted April 2, 2014 Its all TIG welded, using backing gas to prevent the material from burning on the inside. I just booked a dyno session for the end of april, cant wait 1 Link to comment Share on other sites More sharing options...
docc Posted April 9, 2014 Share Posted April 9, 2014 I am sorry the forum lost the last few posts of this great thread. Bjorn, how about a picture of the bike now? Link to comment Share on other sites More sharing options...
Bjorn Posted April 13, 2014 Author Share Posted April 13, 2014 So, for now the fabrication is done. Here is how it looks. Its an older picture, with the temporarily bracket at the end. made all the mounting points flexible by using a steel bush fitted with a rubber one. By this I how the pipes dont crack: The RH side cleaned up nicely: After a test ride i found the noise magnificent w/o the db killer. But is was also too loud. Since i want to use the bike for holidays and dont fancy discussion with the police about the noise level, i wanted to reduce the noise just a bit. The exhaust can came with a standard db killer. Due to the small diameter this really made the exhaust sound weird. We made a new killer with a much larger diameter. In this way the sound/waves do get reflected but do not affect the flow too much. Here is a piece of the original one, and the new one: In order to measure the deviation in the sound level I used an dB-meter. European laws state the measurement should be carried out 50 cm from the rear side of the exhaust, under an angle of 45 dgr. Every motorcycle has a specific sound level at a certain rpm. For my guzzi this is 90dB @ 4100 rpm. I did a couple of measurements: Idle w/o db killer: 84,9 dB Idle with dB killer: 82,6 dB 4100 rpm w/o dB killer: 99,6 dB 4100 rpm with dB killer: 97 dB To the ear is sounds much quieter and not ridiculous. In motion it sounds perfect, its there riding normally and really roars when you open the gas . Its not at the required level, but ill take my changes. 1 Link to comment Share on other sites More sharing options...
68C Posted April 13, 2014 Share Posted April 13, 2014 So what is the other bike just in view, Laverda? Link to comment Share on other sites More sharing options...
Bjorn Posted April 13, 2014 Author Share Posted April 13, 2014 I also made a few Videos however I cant work out the whole youtube setting stuff Final fact for today: Total weight of the old system : 12,27 KG Total weight of the new system: 4,5 KG So i can ''gain'' some weight without a loss in performance hehe The bike you saw, thats my ''other project'' (XS650 scrambler) Link to comment Share on other sites More sharing options...
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