[SEL] More Video./now silencer.

[Elden DuRand]

Jerry:

Thanks for the information.  I've already looked at your page and now know your 'formula'.  Makes sense to me!

Take care - Elden 

> -----Original Message-----
> From: sel-bounces at lists.stationary-engine.com
> [mailto:sel-bounces at lists.stationary-engine.com]On
>  Behalf Of Jerry Evans
> Sent: Tuesday, March 11, 2008 12:27 PM
> To: sel at lists.stationary-engine.com
> Subject: Re: [SEL] More Video./now silencer.
> 
> 
> 
> >Date: Tue, 11 Mar 2008 09:31:23 -0500
> >From: "Elden DuRand" <edurand at mchsi.com>
> >Subject: Re: [SEL] More Video.
> >Jerry:
> >The video came through just fine.
> >I need to study your silencer some more with the 
> Hoyt-Clagwell in 
> >mind.  What formula did you use to determine the 
> size and number of holes 
> >in the tubes?
> >Take care - Elden
> 
> Hi Elden,
>          There is a description of the silencer here:
> <http://www.oldengine.org/members/evans/WolseleyR/
> silencer.htm>.
> or a drawing from the same page here:
> <http://www.oldengine.org/members/evans/WolseleyR/
> sil2.jpg>
> 
>          On this one I did not use any formula - 
> just made sure the total 
> "surface area" of all the holes in each of the 
> baffle tubes was not less 
> than the surface area of the inlet hole (ie. no 
> back pressure worth 
> mentioning). You will notice that the 2nd baffle 
> tube is interchangeable 
> with a "free flow" tube for when I feel like 
> making a bit of noise but 
> actually this engine runs so quietly that there 
> is very little difference 
> when it's idling along - of course, if I put a 
> load on it there would be a 
> big difference.
> 
>          The silencer I made for the Maytag 
> needed a bit of back pressure 
> and you can read about it here:
> <http://www.oldengine.org/members/evans/maytag/muf
fler.htm>

         I know very little (actually nothing :-)) about muffler design - 
pretty much just stumble along and end up with something that works. <grin>

Keep the revs up (or down)
Jerry Evans
Near Johannesburg in Sunny South Africa.
Etched Brass Engine Plates made to order:
www.oldengine.org/members/evans/plates/index.htm