I have a small plumbing problem- I'm using 1 1/2" ID silicon hose for my
cooling, but I have one 45 degree bend where the hose kinks. I'm
thinking of puting some sort of bent pipe or tubing inside the bend to
keep it from kinking. I know that some cars have anti-collapse springs
in the hoses. Does anyone know of anything that will do the job in this
application?

I'm really close to having this plane running and doing some tests, this
is one of the little problems I have to figure out. I don't want to
connect teh hose to a pipe bend, because  that will introduce two more
connections, and therefore two more potential points of failure.

Brian Trubee,
Rv-4, hope to finish by years end.

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If you have room Brian put a short section of bent aluminum tube in there.
Also try this outfit for formed silicone hose.

http://www.samcosport.com/usa/index.asp
It is made in the UK so it is probably REAl expensive

Here is another way of doing it. Carve a male mold out of Styrofoam
and make your own hose. The foam can be removed using acetone and the plastic wrap stripped out.

If you had my book "How to Cool Your Wankel" you would know about this :)

Step 1: cut the form out of plastic pipe the right size or Styrofoam.

Step 2: wrap the pipe form with 10 or more layers of thick (3 mil) clear plastic. Hold in place with scotch tape.

Step 3: wrap with one or more layers of Teflon tape sticky side out. Part number 3M Permacel P421 3/4. There are other brands of this tape that can be used. They come in different thicknesses and widths. McMaster Carr calls it PTFE Teflon Tape. Very important to line your hose with Teflon if it is going to be used in an intake manifold as silicone is affected by gasoline.

Step 4: wrap with one or more layers of red silicone tape. Part number Versaitek Moxness 603 1 inch red sticky side out. There are other brands of this tape that can be used. They come in different colors, thicknesses and widths. McMaster Carr calls it Self-Fusing Silicone Rubber Tape. I prefer the red as it is more likely to be compatible with red RTV.

Step 5: Cut at least two layers of fiberglass tape.

Step 6: Wet out the layers of precut fiber glass tape with red RTV between layers of clear plastic. Strip off the plastic and wrap the saturated fiberglass around the form.

Step 7: Finish wrap one or more layers of red silicone tape sticky side down. It takes longer to describe the process than actually doing it. What you now have is high quality, fiberglass reinforced, Teflon lined high temp hose.  See the attached for the step illustrations.


Paul Lamar