Teflon headers, followup

[Tony Quist]

I was running my DZ in the drive way trying to tune it.  (which I
accomplished)  After 3 or 4 minutes I took my temp gun to the exhaust
and engine.  The Teflon coupler was 375 degrees.  I was shocked at that
temp.
 
-----Original Message-----
From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]
On Behalf Of EHaury at aol.com
Sent: Thursday, October 09, 2003 8:02 AM
To: discussion at nsrca.org
Subject: Re: Teflon headers, followup
 
I've used the 5033K39 in "tunneled" (Typhoon) and "untunneled" (Hydeout)
for several years. Headers are either AAP or CD (cut 0.4" from the
circumference of a piece of 5/8 tubing for a 1/2" "bushing for the CD).
Pipes are Hatori mounted at the inlet and outlet (stinger) on a 5/8 x
5/8 Lord mount. A piece of 3/4" ID silicone insulator (smaller at
stinger) protects wire ties that fasten everything to "clips" on the
Lords. I make the tubing a bit longer than most, around 8", 
 
The tunneled version lasts 200+ flights, the untunneled have not failed
in over 500+ flights. Lord mounts will generally give up before the
tubing.
 
This tubing is on the ragged edge or its heat tolerance. If you find it
necessary to run the engine for more than a couple of seconds at full
throttle on the ground expect to replace the tubing often. This sort of
operation can produce exhaust temps >150 deg above the rating of the
tubing and will take it out fast. "Normal" part throttle flight
operation is on the order of 50 deg less than the tubing is rated, plus
there is good air flow to help.
 
Earl
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