George Lendich wrote:

Paul ( or anyone),
I have in my possession a 13B Rotor housing with the  O-ring grooves (

like the 12A).

Would this be an early 13B?
The exhaust is a lot smaller than other housings I have here.
George (down under)

Yep. I had a 1974 RX4 station wagon with a 13B. It wasn't until about
1989 that they moved the o-ring groves over to the end housing.
Ironically in the RX8 engine they are now back in the rotor housing.

Paul Lamar

Paul ,
Thanks !!
A suggestion put to me was that Mazda MAY have gone back to the rotor
housings O-ring grooves, because there was so much trouble with the end
housings breaking around the grooves.
It was suggested that the aluminium housings are stronger ( here)because of
the steel liner.
George ( down under)

Could be. I think it had more to due with the high heat in the RX8 eng center and
end housings because of the side exhaust ports.

Paul Lamar
 
The Rotary Engine NewsLetter.  Powered by Linux.
ACRE NL web site. http://home.earthlink.net/~rotaryeng/            
Copyright 1998-2004 All world wide rights reserved.