MOPED ARMY

i dont really plan on doing it. i just thought it was an interesting theory and i was wondering if anyone has done it. I thought about wrapping my pipe to raise the powerband, but i figured it would just kill the lowend, which i kinda need on a 1 speed lol.

but then i was thinking. if you cool the exhaust, you could lower the powerband and maybe make a real torque monster.

but now im thinking more, and yeah. this is pretty impractical. interesting though.

i already have a torque monster, 80metra smallport. i was just talking kinda hypothetically.

Sorry, did he wrap the exhaust in heat wrap/tape? Or try a water injection thing?

he wrapped the pipe with that header wrap for cars and it slowed down

some Ducatis i see have them but 4 strokes are way different than 2

The wrap is useful for a stock pipe that isn't performing as it supposed to do. If the exhaust is not getting to the expected top rpm it might help to use the header wrap. It increases the exhaust temperature so the pulse can travel faster en could keep up with the higher rpm.

Cooling ore heating a homemade and calculated exhaust just means the design isn't good.

Not getting maximum rpm? Shorten the header. Etc etc.

thermodynamically, as the pipe is an energy-recovery device, using exhaust gas heat to supercharge the intake, you could see some improvement in efficiency from wrapping the pipe. on the other hand, you would be increasing the temp of the cylinder gasses in the compression stroke, thereby increasing your chance for pre-ignition, which would lower your power output. The heat wrap should slow down the sonic waves in an incompressable exhaust gas medium, by increasing temp the sound waves slow, but the pressure inside the pipe would increase from the temp increase, making the exhaust gasses denser and therfore acting as a tighter 'spring', decreasing response time and raising your powerband. Usually pipes are calculated as adiabatic, as in, no heat transfer through the walls of the pipe, so heat wrap might get a pipe closer to its intended design, but the level of modeling complexity makes this very difficult to do. I would say it is certainly worth experimenting with, but it could go either way depending on the exact pipe itself, even something as insignificant as the thickness of the metal the pipe is made out of, could cause it to switch directions in terms of which way the powerband shifts.

also, on daily driven bikes, heat wrap holds moisture against the bare metal of the pipe and will rust pipes out in a couple weeks, no shit, i've seen it happen with RD yammies.