Pipe coupler

[wgalligan]

After following this post for awhile I have to agree with Allen here.  I had the blue silicon coupler on my ST and Mac pipe and it was aboutt 2 1/2 inches bewtween the header and pipe(due to a blunder on my part in shortening the header too much).  This held up for over 100 flights and was still going strong till it went in last month.  Perhaps the extra length let the whole setup give with engine movement.  I currently use a D.B. hush mount slightly back of the center of the pipe and the blue coupler on my O.S. setup ( 1/2 space bewtween header/pipe) and this type of mount allows enough freedom of movement.

Wayne

 > Have you given any consideration to the torsional forces on the silicone
> joiner? i.e. if the engine is rotating a certain amount and the pipe
> isn't, then the joiner (being the weakest link) has to absorb that
> force.  So, it may not be just exhaust pressure that's causing it to
> blow but a combination of pressure, heat and twisting.
> 
> I found that inserting a short length of ali pipe (offcut from tuning
> the header, about 1/2" long) in the middle of the joiner between the
> header and the pipe, reduces the stress by spreading the twist over a
> longer length.  You can guess what happened the one time I needed a
> shorter pipe length & didn't do that!!
> 
> Hope this helps
> Alan Simmonds
> 
> -----Original Message-----
> From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]
> On Behalf Of Woodward James R Civ 412 TW/DRP (Test Ops)
> Sent: 07 April 2003 16:20
> To: discussion at nsrca.org
> Subject: RE: Pipe coupler
> 
> 
> Hi Jim,
> 
> These silicone couplers do not tolerate gaps over 1/4" between the
> header and pipe very well.  
> 
> McMaster Carr sells Teflon and silicon material.  I ordered 2' of
> "surgical grade" silicone, and 2' of red silicone tubing.  The surgical
> seems to work really well.  However, each one will break quickly if you
> exceed a 1/4" or so gap between the header and pipe.  The closer you get
> them, the better for coupler life. Jim
> 
> 
> Okay guys,40 flts and the coupler(blue)- blew a hole.I am running a
> greve 
> pipe and webra 145. What will hold up better than this.
> 
> Jim Ivey
> 
> 
> 
> jivey61 at msn.com
> 
> 
> 
> 
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