[SEL] More Video./now silencer.

[Jerry Evans]

>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/muffler.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