Paul, i have not had the time to even take the package of o-rings you sent to
me from my office to my garage. i have been busy with some other pressing
business that is taking me away from the eng overhaul. my eng is not quite
ready to try fit the rings but i was wondering about the hardness of the oil
control o-rings. they seem harder
or more stiff than they should be. that implies that they may possibly stand
up to more heat but may not seal as effective as the original O-ring. by the
way the fc3s newsletter about the 2nd gen mazda cars that i subscribe to are
having problems with the dealers having two different color oil rings. one
may be a later part number
and i am trying to find time to check out this. the seals you sent me seem OK
for the other uses in the eng but i am Leary of trying them in my eng just
yet for oil control o-rings. not sure what i will do about that just yet. has
Bruce turrentine tried these
or had time to look at them yet. may i suggest that you send Bruce a set of
just the oil control rings or better yet a full set for his opinion which i
for one would highly
regard i think he builds up a lot of engs so he may be able to get info back
to us sooner.  i did not know that i was the first to get the new rings. if
these are indeed better rings i am sure that Bruce would be interested in
using them in his overhauls as a product improvement. what do you think about
this Bruce??  tom Kimsey

Well they are harder with a higher shore number but that should not
be an issue. What is important is; that they do not take a permanent set.
O-rings are rated for permanent set. These rings are rated highly for
not taking a permanent set.  I am willing to test them on
my dyno and if they don't work out.. tear the engine down and put something 
else in. I have driven my Cosmo for a year or more with shot oil o-rings.
What happens is they seep oil into the combustion chamber and smoke when 
you start them up but they run fine afterwards. The point with the teflon 
coated silicone is they are not as likely to fail from minor oil overheating 
as happened to my Cosmo. If you are uncomfortable putting them in... put 
in stock O-rings and wait till I can get a chance to test them on my dyno 
engine. Or wait till somebody else is willing to buy a set and test them.

This is why we call it R&D :-)  

As far as color of stock oil o-rings Mazdatrix told me green is the latest.
Perhaps if you are getting some other color it is old stock.

I am taped out money wise for awhile on R&D. I just bought by re-drive 
and EFI and I have had a few other extraordinary expenses.

Paul Lamar
 
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