[NSRCA-discussion] Header coupler

[Dave Michael]

Fred Lumb in Pennsylvania makes custom couplers for the IMAC guys and the gas engines.  He can even make them stepped inside so that one side has a smaller diameter than the other, for example.  I have used them on my gas engines and they have lasted no problem. 

His e-mail is  lum945 at aol.com
  ----- Original Message ----- 
  From: Rex 
  To: NSRCA-discussion 
  Sent: Monday, June 01, 2009 7:02 PM
  Subject: Re: [NSRCA-discussion] Header coupler


  George
   
  In a totally different project years ago, I had a similar dilemma...  I used a piece of woven stainless
  tubing, inside an outer jacket.  The tubing is made to slide over heater hoses, vaccum lines on engines.
  I can't tell you right off hand where to get it, but I'd bet some of the better automotive stores would have
  it or could get it.   I simply cut a piece a little longer than the hi temp rubber coupler, slid it inside the 
  coupler, then slid both layers over the header/muffler fittings.  Seemed to work well, I never had any
  blow through problems again....   You could slide this stuff into the teflon, then attach.  most of the heat
  would slide right on through.  BTW, it was tough to cut, and I eventually settled on  a diamond wheel to 
  get a clean cut.  The neat thing about this stuff is that it's like chinese finger cuffs...  you pull on each end
  and it shrinks in diameter, push it together and it expands.
   
   
  Rex
   
  > Date: Mon, 1 Jun 2009 17:07:27 -0500
  > From: glmiller3 at suddenlink.net
  > To: nsrca-discussion at lists.nsrca.org
  > Subject: [NSRCA-discussion] Header coupler
  > 
  > Hello all.
  > 
  > I need to tap the collective expertise here on the web.
  > 
  > As some of you know, I've been working on a gas conversion of an OS 160....it is running very well and I'm quite happy with the weight/performance and ease of use. 
  > 
  > BUT I'm having a problem with the muffler coupling. 
  > 
  > I'm using a Mueller header and an aeroslave carbon pipe.....the header has a 3/4 in outer diameter. 
  > 
  > My first coupling material was teflon tubing from McMasterCarr...the "thick walled" 3/4 inch ID tubing...
  > 
  > This held up pretty well as long as I had the space between the coupled pipes very small...but I was getting contact between the pipes (that was the metal "tinging" that you were hearing, Lance)..which eventually caused a burr on the tube and resulted in a hole in the coupling.....So I made the gap a little wider 1/4 inch or so and now the teflon coupler is melting through in a flight or two.....so I need an alternative material.
  > 
  > I remember that we used to use a thick silicone coupling material for helicopter header/muffler connections but I can't find it anymore...Surely someone here has some ideas and a source where I can get it.
  > 
  > Let's hear it!
  > 
  > Thanks in advance,
  > 
  > George Miller
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