Quiet intake box for webers R&D, For us wimps Options

['73-914kid]

Well, I'm working on getting the intake noise silenced, and certainly more quiet than it currently is on my car at the moment. Yes, I'm a wimp, and I get BS about it from my dad constantly.

Anyways, I've been throwing around the idea of somehow creating a common plenum style air filter box, similar to that of a 911 engine. Then came my physics class.. We're currently going in depth about standing sound waves, noise cancellation, and acoustics. Amongst this, the topic of Helmholtz resonators came up. Huh, well, that sounds familiar... "used to create destructive interference of standing waves in an internal combustion engine intake system"

The wonderful thing about Helmholtz resonators is that you are not sacrificing ANY air flow through the intake to silence the noise. The box is simply creating a resonating soundwaves with an exactly inverse wave that acts as active noise cancellation. Kinda like this:
(IMG:http://www.914world.com/bbs2/uploads_offsite/library.thinkquest.org-9714-1361412564.1.gif)

For those of you that are not familiar with these on new cars, a Helmholtz resonator is this odd looking box sticking out the side of the intake tube:
(IMG:http://www.914world.com/bbs2/uploads_offsite/images.monstermarketplace.com-9714-1361412564.2.jpg)

The plan right now is to create a common plenum with two pipes leading to a Smooth T in the middle, and then the center pipe having a helmholtz resonator attatched to it. There was also some discussion with my professor that the distance between the carb throats to the resonator might be too great for the sound waves to cancel effectively. The idea of having 2 separate resonators on each connecting pipe is also being considered.

I won't get into the calculations on all of this, for the size geometry, and design of the box, but If I can get this to work, and really silence the intake noise, I will be manufacturing, and selling these systems, for FAR less than the only other common plenum intake system (790 Euros)

This will show the development and design of this system for those that are interested.