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Dyno Room questions

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Craighell

Automotive
Feb 15, 2002
31
I thought of putting this in an acoustical engineering forum, but I want REAL results rather than theory.

Has anyone insulated a dyno-room for sound reduction (or any room - rock band jam session room in basement etc.)?

What material did you use and how thick?

What drop in sound pressure did you measure?(db a-weighted prefered)

The neighbors hate me and I'm trying hard to keep my dyno usable.

I am sound proofing as I type this, and yes I have lots O' books and info, but I figure with all the brainpower and experience on this forum, someone has actually done this already and may have good advice on DO's and DON'Ts. and what to expect.

Thanks in advance!

Craig (hell fire)

P.S. I'm currently using 3/4 inch Cellotex foam insulation and 1/2" plywood on a 2/4 framed enclosure. The building itself is additionally insulated with 3/4 inch Cellotex.
 
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Craig,

I have added a fairly inexpensive sound proofing to our dyno cell that seems to work fairly well. I have pictures of the cell if you would like to see it.

I did not measure the actual db drop, but the room is failry sound dead.

Post your e-mail address or e-mail me directly and I will tell you more in depth what we have done.

gearhead@smithtex.com
 
That would be great.

You can e-mail any photos to me at: Craig@hellfireperformance.com

Thanks
 
We did this at work. I don't have dB figures, but would guess that it is at least 10 dBA better than a bare cell, inside, and possibly better than that.


1) Mount your engine frame to the floor via engine mounts.

2) Use a good exhaust (typically a truck exhaust)

3) Build a framework inside the walls and ceiling, about 600 mm in. Then mount steel perf sheet backed with rockwool to this. This gives you 80% plus of the performance of fancy sound absorbing wedges of the same length, for a tiny percentage of the cost (our facility for measuring interior noise on a chassis dyno uses this technique as well).

4) Block all the holes in the wall up.

5) maybe invest in a heavy door

6) The key to most noise improvements is mass and sealing. Building a heavy concrete outer wall around your dyno cell may be the best method.

This is quite a big project, you might want to spend a bit more time identifying exactly which noise is upsetting your neighbours, and where it comes from.
Cheers

Greg Locock
 
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