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.
http://www.creavey.com/
Coolant O-rings:
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 outer section size is 0.093. Not 3/32 inch
as a 3/32 inch O-ring is bigger in section size than 0.093 inch.
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 TES O-rings 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 leaves too
little of a safety margin when 500 degrees F is available
in TES O-rings at the same price probably.
Paul Lamar
Thanks for this info Paul.
This still leaves out the dowel pin o-rings.
You wrote that racing guys have been using these TES o-rings for years, yet
all we have are the dimensions, no part numbers. I'm really worried using
unproved products.
Maybe I should take the engine apart to see what I really need.
Finn
"I'm really worried using unproved products." You have got to be kidding Finn.
I have seen your engine installation :-)>
They are not unproved products.
You want low prices and the right part or do you want a part number?
Go to Hayes Rotary Engineering and get a part number and pay $25 each.
He has been selling them for years to the racing crowd at that price.
There are two ways to buy parts in the world. You can specify exactly
what you want or you can specify a part number. Frankly I have had better
luck specifying exactly what I want.
Measure the dowel pin O-rings and buy them from the Creavey section size
catalog below. Tell Jeff Chrysler at Creavey what the IDs of the dowel
pin O-rings are and he will send you the right part.
Paul Lamar
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