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Paul
Joe Ancona wrote:
Hello Paul, I just talked with my rotary guru buddy here at work, and he
actually
met you at Mazdatrix a while back! I guess you were testing a 13B on
their engine only dyno...
We have an old 13B rotor and housing here at work, and I now see the oil
seals you are talking about...
My buddy (name: John Yamasaki BTW) indeed agreed that these are the
seals that go bad under high heat etc...
He thought that they were made of Viton rubber... a compound that we use
exstensively in our flow products...
I can see the benefits of Teflon here...
John has been CC'd on this email... at least you will be talking to a
real rotor guru now!
Joe
Rotary Engine wrote:
Joe Ancona wrote:
I think I figured it out. I think you put the rotor
on top dead center and screw a fitting into the spark plug
holes. IMHO this checks the O-rings around
the oil scrapers. What probably happened is the O-rings in
the oil scraper rings melted when the oil over heated.
Mazda uses some sort of O rings in those scrapers
but I have no way of knowing what material they are made of.
I can tell you this. They are not as temperature resistant
as they could be as we boiled some in oil. I drove my 1976 13B Cosmo
for years with burned out oil O-rings and the smoke upon start up
obscured the sun.
The best O-rings for this job are Creavey Teflon encapsulated
silicone O-rings good to 500F. Teflon is inert to all known
chemicals and silicone is good to 500 F.
BTW Joe what do you do for a living? The reason I ask is
you are very knowledgeable on the rotary.
Paul
Thanks Paul, but I am a relative newbie, on the rotary, although I
have been a LONG time fan and have
been interested in them for a long time...I amm however a pretty good
internet researcher and can be a
pseudo-expert on just about anything in a short time! Having an RX-8
has surely accelerated this knowledge even faster!
I am not sure about the oil O-rings, but on the Renesis I thought that
had changed all the sealing devices on the rotors to a new design
that were for the most part, hi-temp and resistant
to most substances that had caused problems in the past....
I work for a company that builds liquid and gas flow, and pressure
meters and controllers for the aerospace, medical, automotive, fuel cell
industries... so I have some basic knowledge of flow/pressure, as I
have to deal with it daily!
Your idea with the spark plug check sounds like the standard
compression check, and this could be what
Mazda is going to do, however there is alot of talk about the MOP, so
I don't know if it is a oil system only vacuum
check or what... probably not though...
cheers,
Joe
The RX8 rotors have the same type oil seals as the RX7 rotors.
It is like a compression check but they will use a hand
vacumm pump you can buy in the auto parts store instead
of a pressure gage.
Here is a picture.
Check out my web site http://www.rotaryeng.net/
Paul
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