Dyno cell noise cancellation

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Tom Cannon
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Dyno cell noise cancellation

Post by Tom Cannon » Wed May 04, 2016 10:59 am

Is it possible to make 8000 rpm whisper quiet?

I own a building that was a Bakery. One of the basements has a room that the boiler was in. To me it looks like a built in dyno cell, would be perfect really. I wouldn't want to get the neighbors upset with me. Anyone have any experience with this?

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Re: Dyno cell noise cancellation

Post by Sir Yun » Thu May 12, 2016 5:59 pm

https://drive.google.com/file/d/0B_l73G ... ef=2&pli=1

while not about dyno cells the basic principles do apply.
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Rick Finsta
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Re: Dyno cell noise cancellation

Post by Rick Finsta » Fri Jul 22, 2016 8:55 am

I'm going to generalize here, because I'm far from an expert...

The thing to remember is that you can isolate, or you can absorb, or you can do a little of both.

The problem with isolation is it is design intensive - things like floating floors and walls that are very heavy and isolated from contact with each other and other structures. Room-inside-a-room stuff often using special materials and fasteners/adhesives.

The problem with absorption is it that it is frequency-dependent and the lower the frequency, the harder it is to absorb. Also, special materials are involved and they aren't cheap.

If you are interested, go to recording studio forums and read up. I've got a studio but I only needed to absorb to stop reflections causing listening issues at the mixing position so that's nothing like trying to stop noise from escaping the space. Honestly, starting in a basement is a pretty good first step there, since you don't care about noise coming IN.

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Re: Dyno cell noise cancellation

Post by JoePorting » Fri Aug 05, 2016 12:52 am

I wouldn't think this would be a big deal since a dyno run is usually only about 3 or 4 minutes long, with the actual WOT dyno run only lasting 5 seconds or so.
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Re: Dyno cell noise cancellation

Post by MadBill » Sun Nov 13, 2016 5:39 pm

However short-lived, the bellow of open headers is not music to everyone's ears. Many years back we were tuning my pal's 1600 cc Formula Ford in my driveway, checking for spark retard at 6,000 RPM. When we shut it down, we realized that a neighbor had been screaming himself hoarse all the while, telling us to shut that <%$@# thing off! :roll:
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Re: Dyno cell noise cancellation

Post by j-c-c » Fri Jul 07, 2017 12:35 pm

Rick Finsta wrote:I'm going to generalize here, because I'm far from an expert...

The thing to remember is that you can isolate, or you can absorb, or you can do a little of both.

The problem with isolation is it is design intensive - things like floating floors and walls that are very heavy and isolated from contact with each other and other structures. Room-inside-a-room stuff often using special materials and fasteners/adhesives.

The problem with absorption is it that it is frequency-dependent and the lower the frequency, the harder it is to absorb. Also, special materials are involved and they aren't cheap.

If you are interested, go to recording studio forums and read up. I've got a studio but I only needed to absorb to stop reflections causing listening issues at the mixing position so that's nothing like trying to stop noise from escaping the space. Honestly, starting in a basement is a pretty good first step there, since you don't care about noise coming IN.
I think you greatly understated your grasp of this issue :D

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Re: Dyno cell noise cancellation

Post by miniv8 » Fri Jul 07, 2017 7:03 pm

Look up your local egg farmer, and purchase a pallet of egg-trays to cover some of the walls and ceiling.

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Re: Dyno cell noise cancellation

Post by stealth » Wed Dec 13, 2017 5:56 pm

MadBill wrote:
Sun Nov 13, 2016 5:39 pm
However short-lived, the bellow of open headers is not music to everyone's ears. Many years back we were tuning my pal's 1600 cc Formula Ford in my driveway, checking for spark retard at 6,000 RPM. When we shut it down, we realized that a neighbor had been screaming himself hoarse all the while, telling us to shut that <%$@# thing off! :roll:
Yeah...neighbors are like that. Can run a chainsaw all day, but fire up the hot rod and they go crazy.
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore, all progress depends on the unreasonable man.

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Re: Dyno cell noise cancellation

Post by Frankshaft » Fri Mar 02, 2018 9:19 am

A friend of mine made his dyno mufflers. He used 2 big pieces of under ground sewer pipes, made from concrete, I am talking big ones, not sure the dimension, but big. Buried in the ground on top of each other, he basically made a giant flow master out of concrete buried in the ground, he is in a fairly rural area, but he has neighbors close by, the one guy got mad, in a joking way. Hey, I can't hear it anymore. I used to love coming home and hearing that sound. Now I hear nothing.

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Re: Dyno cell noise cancellation

Post by j-c-c » Fri Mar 02, 2018 9:48 am

Probably gets rid of any mole problems, at least that's the story to tell your better half. :D

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