In my book I had a chapter on how to make your own custom silicon
rubber hose  with a Teflon liner.

The situation reoccurred as I needed an odd hose ID for the intake manifold.
About 10 or 12 years ago I had a KIS cruiser which I sold after in installed the engine.

The KIS cruiser had a record low cowl. It was real tricky to get an intake manifold under
the cowl so I choose pipe bends. pipe bends as opposed to tubing bends is available
in much smaller centre line radii. Based on that I proceeded to build patterns for the
casting part that bolted to the side of the rotary.  This was before I decided to
go to P-ports. Tracy was using side ports so I thought the main demand was for
side ports. All well and good. Several people built manifolds based on these
parts. Consequently we needed hose that corresponded to the OD of pipe.
Pipe is sold based on ID. The OD is some odd number. Hence the custom hose.
Now a-days you can buy rubber couplings for the pipe sizes in the hardware
store. For my manifold it was too thick so back to custom hose.

When saturating the fibreglass tape with silicone paste don't get carried away.
Use just enough and use a roller between garbage bag plastic sheets to make
sure the fibreglass is adequately saturated and as thin as possible.
Wrap it tightly over the lower Teflon layer. Let it cure for 24 hours.

Now comes the last layer of silicone rubber tape. This works if you install
it right away. If not it wrinkles inside and makes it harder to install.
Silicon rubber tape is real rubber and it tends to return to its
original length and squeeze the hose.

If you don't need 500 F use 200 F Vinyl. Less rubbery.
200 F is plenty for the intake manifold as it runs ice cold.

BTW this side port manifold weighs 10 pounds. Twice the weight of a
P-port and slide throttle.

I no longer recommend it. I just had one lying around so I used it on Mike's RV4.
The RV4  has one of Tracy's early 2.12:1 gear box with the prop turning the wrong
way. No point in putting a P-port in that. I don't have the money for a new prop
and 3.12:1 gear box anyway. I have a P-port RX8 engine waiting to go in on the other hand :)

Paul Lamar

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