Wave dynamics type question.
Posted: 05:58 pm Apr 08 2016
Hi I have a bit of a wave dynamics type question. I thought I would run it past their as you seem a learned bunch.
My problem is I have made a sound wrap for my exhaust. Now this worked just fine once I figured out how to manage it. Well it did work fine till I pushed the bike further and it just gave up and wanted to fall off. (Page 30 from my signature link for the details)
Part of this pushing the bike further was gearing it up to a point where I no longer could get instant wheel spin sub power valves opening. Top end is still more than enough and behaves like a four stroke by having long legs.
Putting the sound wrap on changed the expansion chamber by keeping the heat in which turned my desert pipe into a topend road race pipe (the waves mover faster in a high heat environment) I moved the revs back down enough with a 20mm spacer.
With the taller gearing I feel I can get sharpen the bottom end up by removing the sound wrap. This should match the bottom end with the top end again and we start again.
Now if I remove the wrap I have a opportunity to remove sections. My thinking is waves travel by reflecting and spherical radiation which is controlled in the pipe. Turns cause a loss in the sharpness of the wave front which should be kept to a minimum. In a perfect world we would all have straight pipes but we can't. Now if I kept the sound material on the slow side of a bend I may be able to trick the pipe into thinking it's straight.
Now don't give me the maths as I don't know it just the pictures. I have ran this through my head and can see it behaving in a few different ways that contradict each other. Add to that the wave has to come back the same way.
Is the inside or outside the slow side of the bend?
My problem is I have made a sound wrap for my exhaust. Now this worked just fine once I figured out how to manage it. Well it did work fine till I pushed the bike further and it just gave up and wanted to fall off. (Page 30 from my signature link for the details)
Part of this pushing the bike further was gearing it up to a point where I no longer could get instant wheel spin sub power valves opening. Top end is still more than enough and behaves like a four stroke by having long legs.
Putting the sound wrap on changed the expansion chamber by keeping the heat in which turned my desert pipe into a topend road race pipe (the waves mover faster in a high heat environment) I moved the revs back down enough with a 20mm spacer.
With the taller gearing I feel I can get sharpen the bottom end up by removing the sound wrap. This should match the bottom end with the top end again and we start again.
Now if I remove the wrap I have a opportunity to remove sections. My thinking is waves travel by reflecting and spherical radiation which is controlled in the pipe. Turns cause a loss in the sharpness of the wave front which should be kept to a minimum. In a perfect world we would all have straight pipes but we can't. Now if I kept the sound material on the slow side of a bend I may be able to trick the pipe into thinking it's straight.
Now don't give me the maths as I don't know it just the pictures. I have ran this through my head and can see it behaving in a few different ways that contradict each other. Add to that the wave has to come back the same way.
Is the inside or outside the slow side of the bend?
