Teflon headers, followup

[EHaury at aol.com]

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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