Snip
Since we are on the subject Fred here are a few more gifs
of the TES variety.
I will outline what we are talking about.
There are four coolant sealing O-rings per rotor housing.
Two outer and two inner.
There are also four oil sealing O-rings per rotor. Two on each side of
the rotor proper. These are located on the flanks of the rotor.
Two per side.
Snip
Thanks Paul. I had copied the o-ring stuff the last time you put it out.
Do we special
order from Creavey or did one of the other suppliers start to stock our
special sizes
?
Fred O.
Don't know about that. Been talking to Dave Lemon at Mazdatrix.
Perhaps I should suggest to Jeff Chrysler at Creavey he make
up a 13B overhaul kit. If enough people bug Dave Lemon he will add it
to the Mazdatrix catalog. Also Tracy is a potential distributor.
How many would buy a kit of TES O-rings when they rebuilt their
rotary? Roughly the same price as the Mazda kit.
Paul Lamar
We have overhaul kits on the website now. They use the TES O-rings in the
locations where it has proven to work correctly (correct cross sectional
area, length etc). The oil control O-rings are currently Viton. Makeup of
the kit will change as we gain more experience and learn exactly what fits,
and what works. The apex seals are the two piece type that should give
longer rotor housing life (no sharp corner piece).
Tracy Crook
tcrook@rotaryaviation.com
www.rotaryaviation.com
Thanks Tracy. That is a good start. I am very pleased and relieved (to say the least)
that you are getting into this. The rotary aircraft people have unique
requirements and cost is not as important as it is for say, Mazdatrix
or Racing Beat's market. The overhaul kits for our needs should have durability
and robustness as the primary driver.
I rewrote that blurb on the TES O-rings. You really need
to carry the oil O-rings too. Here it is again.
*********************************************************************
I will outline what we are talking about.
There are four coolant sealing O-rings per rotor housing.
Two outer and two inner.
There are also four oil sealing O-rings per rotor. Two on each side of
the rotor proper. These are located on the flanks of the rotor.
Two per side.
Teflon encapsulated silicone O-rings are the best there is for this
application. Teflon is about the most inert material you can
find and it is resistant to most known chemicals. Unfortunately
it is not rubber like and that is where the high temp silicone
rubber core comes into play.
http://www.creavey.com/
1. Inner coolant oring -
circumference = 28.625
diameter = 9.111
slot depth = 0.062
slot width = 0.141
section size = 0.103
2. outer coolant oring -
diameter = 11.340
slot depth = 0.062
slot width = 0.110
section size = 0.093
This is critical! The proper section size is .093. Not 3/32
as a 3/32 O-ring is bigger in section size than .093.
The TES O-rings are stiffer than the stock O-rings. It is harder
to get them to lie in the groove. Even with Vaseline. When you buy
them they don't come flat. I found that using a plywood
form to pre set the slightly under size TES O-rings for a few
days works well. Here is a picture.
--------------------------------------------------------------
Oil O-rings.
I checked the installation of the oil O-rings with the new
sizes I got from Creavey. They worked perfectly and were
very easy to install. You will need a little O-ring lube
and a 2 by 8 to install them. They were also easy to remove
with no signs of distortion.
One of the secrets is if you reuse the old oil scraper rings
they must be spotlessly clean inside and out. Soak them
in carb cleaner for a few days. If you use new scraper rings
this will not be a problem of course.
The second thing to watch out for is don't nick the
rotor wall between the two scraper rings when you remove them.
Very very important!!
These can be the same or just a little more than the
stock oil O-rings from Mazda.
The proper oil O-ring sizes are:
0.093" section 4.68 inch ID
0.118" section 4.33 inch ID
I can vouch for the quality of the Creavey O-rings but some
of those water TES o-rings from Mcmaster Carr I have seen
are not as good. This is not to say they won't work. They just
don't look as good around the joints as Creavey O-rings.
Viton is good only to 400 degrees F. The center of the rotor runs
as high as 500 degrees F. I think 400 degrees F leave's too
little of a safety margin when 500 degrees F is available
in TES O-rings at the same price probably.
Paul Lamar
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