Paul, i did try to work the o-rings a little bit to see if they would stretch
a little bit. i am speaking of the inner coolant O-ring. the outer ones fit
perfect. when trying to work the rings i put more and more pressure on
pulling them until they all of a sudden
did stretch a little bit. well the results of that caused a small necking
down of that ring
so i am not confident of using that ring (I did this to only one ring). I am
afraid of the necked down part not being large enough to seal properly now.

No confidence no
install. i did order the McMasters o- ring part number 9319 K239 that Ed
Anderson
gave me and it is just a scosh bit too small. i think that it will work if we
are careful
about not letting it pop up and out of the groove when assembling the engine.
if i am not mistaken that is what happened to ED when he put his engine
together. i can
understand how easy that is to do and any one who rebuilds his engine will
too when they tackle this job. i talked to the guys at Rotary Performance in
Garland Texas
about this topic and they use only the factory seals. They have the fastest
RX-7. they rebuild a lot of engines too and have a great reputation for
quality work. i still feel like
it is advantageous to us to use the Teflon encapsulated silicone o-rings.
tom Kimsey  getting a lot of rotary engine knowledge. thanx

Sorry about that inner O ring. I think it will be OK if you put the necked down part
on the cool intake side of the housing and use a bit of red RTV.
There must be some kind of adhesive that will hold these in place while one
assembles the engine.

Paul Lamar

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