>I found another engine that somebody had over hauled with Teflon
Encapsulated
> silicone O-ring that were too large in cross section. The Teflon was
extruded
> into the space between end housing and rotor housing. This was also
due to
> another mistake made by the over hauler.
>
> He/She used some sort of gasket compound between housings. THIS IS A
BIG NO NO.
> Do not use anything between housings!!! NONE NADA!! The engine is
designed to
> run metal to metal. Let the O-rings do their job. Follow the
instructions in the
> over haul manual precisely. Also the gasket material partially fills
the O-ring
> grooves not allowing the O-rings to expand fully.
>
> The owner of this engine was lucky the silicone did not expand further
and crack
> the end housing. It has happened several times.
>
> The first picture is the O-ring I took out of the engine.
>
> The correct section diameter for the inner slot is .093" maximum and
> .080" to be on the safe side. Do NOT use 3/32" as they can be as much
as .110"
> in diameter. The outer slot is narrower so .080 is a max section
diameter.
> Mic the new O-rings before you install them to be sure.
http://www.creavey.com/
>
> Teflon encapsulated silicone O-rings are great if properly installed.
They will
> tolerate a moderately over heated engine as TES O-rings are good to
500 F and
> Teflon is inert to all known chemicals unlike silicone alone.
>
> Paul Lamar




Paul,

I have been a subscriber to your newsletter, on and off, for the better
part of two years. This specific e-mail speaks volumes about your skill
sets. I would like to address those skill sets, if I may, and to offer
my compliments to you, and to the many fellow respondents that
contribute immeasurably to the body of this newsletter, and in doing so,
to it's overall success.

Some background about me: I am building a Zenith CH 801 STOL aircraft.
FAA tail # 'reserved' N801YZ. Zenith serial # 5754. I am sold out
(think; like someone that is sold out for Jesus) on the rotary engine. I
had planned on installing a Walter LOM, inverted, supercharged, 6
cylinder engine, due to it's low weight vs. high horsepower (relatively
speaking). However, the factory does not support this engine to the
degree that I want or need any longer, and that is a BIG problem! Along
this same time frame, I stumbled upon Craig's rotary page, and lo and
behold, your newsletter and many other links were discovered for the
first time there. The rest as they say, is history.

Of some note: I have a second bedroom in my home, which is where I
currently house the kit components to my future mistress. I've elected
to stave off the building process until I return to the USA, from Iraq,
for good. April 09, should be about the time that I begin in earnest,
the assembly of N801YZ, and with it, the acquisition and build up of one
20B engine.

The discussions that take place on this site are highly rewarding. Facts
are supported and theories are turned inside out. Varnish doesn't exist
on the shelves of the rotary tool shed. The degree and amount of
diagrams, images, charts, graphs, etc, that appear on this site
overwhelm me. I absorb what I can, and file the rest away in the
'knowing that it's only an e-mail away' category, should I need help,
_of just about any kind I might add!_

Paul, I know you're offering up a part of your life through this
website, and I'm pretty sure it's a labor of love too. For that, I offer
up a humongous thank you, to you Sir, to Robin, and to all of the fellow
travelers hurtling through time and space!

Speaking specifically, to this particular e-mail, I have been
informed about a very poor building practice (amateur and verboten),
validation once again of your expertise and your willingness to share
the same with us, an excellent image montage noting the discrepancies,
follow on advice as to 'tricks of the trade', specific technical (micro
measured) dimensions, best nomenclature and brands with active links
provided, indispensible teaching moments, and the continuation of a very
active newsletter with daily postings just like this one (lifeblood of
the same).

Yes Paul, I am obviously providing a flattering e-mail to you, and quite
frankly, it's long overdue. I look forward to the day that a 20B engine
takes up a prominent place in my home, and because of it, I'm sure I'll
have something to ask or report. Thankfully, there's a great place to do
that... right here!

Thanks again Paul, and thank you fellow contributors,

Perry IL



I have gone to rotary school 24/7 for ten years now :)

Paul Lamar