> jim wilson wrote:
     >
     > I am building an older Wheeler Express. I have rebuilt a
     number of
     > Mazda 12A's in the past, all of which are still running.
     I need 210
     > to 260 hp. Can a 13B be modified to do this and remain
     reliable?

     Absolutely. Piece of cake with a turbo. Non turbo you will
     need a 3
     rotor.
     If turbo 13B I would assemble the engine with two piece  3
     mm apex
     seals to guard against detonation that can fracture the
     stock 3 piece
     seals.

     Paul Lamar

Might consider the new Mazda 13b replacement seals... 2mm 2 piece.
They are the standard replacement seal that supercedes the 3 pc
seal. It *should* be stronger than the 3 pc seal, and not require
tricky remaching of the apex slots.

Incidentally, when I was developing our 240hp supercharged engine, I
ran into detonation and it broke the end housing before it broke the
3 piece apex seals. The end housing in question was a 1988 turbo end
housing. Our engines now all have stronger end housings similar to
the 93 and later castings... more material around the dowel holes.

Jon Lauter
Rotary Power Marine Corporation

That's the expensive way Jon. Should have added a few more hollow
dowels :)

Paul Lamar
 
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