I needed some custom size thin wall hose for connecting the various
parts of my tunable intake manifold so I decided to make some.
Most hose comes in 1/4 increments and  I was using pipe
instead of tubing.

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

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 layer of teflon tape sticky side out.
Part number 3M Permacel P421 3/4

Step 4 wrap with one layer of red silicone tape.
Part number Versaitek Moxness 603 1 inch red sticky side out.

Step 5 cut two layers of fiberglass tape.

Step 6 wet out the two 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 layer 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.

Paul Lamar

"Joe Hull (Pilgrim Technologies)" wrote:

Aren't you concerned about parts of the Teflon tape delaminating from
its adhesive with temperature and age and sagging into the pipe/tube?

Joe Hull

No! First because the tubes are butted together. Also it does not make much sense
to use a low temp adhesive on a 800 degree F teflon tape. I have used
this teflon tape on motor mount tubes adjacent to the exhaust on my C182 
and I see no such deterioration. It appears to be a miracle of modern chemistry.

Delete the teflon step if you are worried about it. I used it because it is
inert to gasoline while silicone is not.

Here is the finished hose clamped to a plastic pipe using those nifty
1/4 inch wide Breeze miniature hose clamps.

Paul Lamar
 
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