snip.....
     > Francois is concerned about apex seal life with the PP.  I'm not sure
     > why.  Do you have any data in your archives about this Paul?  I'm okay
     > with however Mistral goes, I'm just happy to have a solid company
     > building all aluminium engines.  I'm especially happy that he is going
     > to sell us parts.  Thank you Francois.  Let us know pricing and
     > ordering details as soon as possible.  I think you should sell parts to
     > the automotive aftermarket as well, it should help increase your
     > production volume.  We can always develop an aftermarket STC a
     > Peripheral Port kit for the Mistral engines.
     >
     > Hans Conser

     I have no hard and fast data but I suspect the apex seals will run cooler
     as they get a chance to be blasted by cool air. Side port seals run
     500 F. As far as the affects of the port opening itself... it is no worse than
     a peripheral exhaust port.

     So far Mistral has not committed to aluminum end housings. I could be wrong.
     What I saw at OSH was a new rear housing cast in iron.

     BTW how many people would be interested in an aluminum end housing if they
     cost $1500 each?
     $1000 each?
     $500 each?

     As far as design is concerned I still think the two piece is the way to
     go. Cheaper, more reliable and over haul able as the hardened steel insert
     can be replaced or ground and re nitrided. It needs to be tried.

     Paul Lamar

     Paul,
     Here is an idea for a cheaper way to build these aluminum end housings.  Use the '84 - '85 13b rotor housings (these rotor housings contain the water oring) + a full size steel end
     housing surface (~.150" thick - is this thick enough?) that is a duplicate in shape to the end housing and this steel surface would mate to the aluminum end housing in a sandwich.  Note
     that the steel surface would contain the bolt holes and water passages but tolerances would not be terribly critical except for the dowel holes. This would avoid close tolerance machining
     of the aluminum end housing and the steel insert required of the original design plus avoid the problems with the oring land.
     Ken Powell
     Bryant, AR

 
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