the TURD
NAXJA Forum User
- Location
- SE Michigan
Recently I redid my exhaust system, and found that it droned terribly between about 2600-2900 RPM. It was miserable to drive and I felt like an idiot teenager driving around. So I figured I'd try a something I'd read about called a 1/4 wave resonator.
It's basically a capped pipe that tees into your exhaust pipe, and what it does is cancels noise waves by sending an equal and opposite wave back into the exhaust pipe. The exact frequency it targets is based on the length as well as the chemical characteristics and temperature of air inside the pipe.
This is what mine looks like.
As you can see, it's pretty simple to build and install. I made mine about 30" long and it worked wonders. The average sound level in the drone area was reduced by 11 dB, which is a 10x reduction in sound energy.
If you want more details, visit my blog: http://ironhydroxide.blogspot.com/2017/09/drone-warfare.html
Sorry, I just didn't feel like typing everything twice.
BTW, if you are wondering what my exhaust sounds like, this is it:
https://youtu.be/ArbPoxbWSog
It's basically a capped pipe that tees into your exhaust pipe, and what it does is cancels noise waves by sending an equal and opposite wave back into the exhaust pipe. The exact frequency it targets is based on the length as well as the chemical characteristics and temperature of air inside the pipe.
This is what mine looks like.
As you can see, it's pretty simple to build and install. I made mine about 30" long and it worked wonders. The average sound level in the drone area was reduced by 11 dB, which is a 10x reduction in sound energy.
If you want more details, visit my blog: http://ironhydroxide.blogspot.com/2017/09/drone-warfare.html
Sorry, I just didn't feel like typing everything twice.
BTW, if you are wondering what my exhaust sounds like, this is it:
https://youtu.be/ArbPoxbWSog