Francois,
I don't know if this helps, but I agree with you on the side ports, I
also
think they are restrictive and not just for the reason of surface
area,
That's why I like the P-Port 'direct inlet' - better breathing.

I'm not trying to convince you of anything - just a suggestion!
George (down under)

I agree with George on this Francois. You are building your own rotor
housings
and end housings why mess with side ports? Aluminum end housings are
much
easier to make if you don't have ports in them. Here is an Everett
Hatch engine
with aluminum end housings and P-ports. Super simple. 200 HP is
absolutely no problem
at all and the intake manifold is simpler and cheaper.

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,
I am working on that - so too is Richard Sohn!

I've cut down 2 sets of cast iron housings (one early, one late) to pick the
best attributes for Aviation use. Strangely there are some difference I have
yet to work out the reasons for - but I will get there, and Butch is working
with me on this.

As you say Paul the two piece insert is the way to go!

One interesting thing is the later model front (our back) housing is a good
6 to 8mm shallower ( water jacket) than the early 12A. This to my mind would
restrict flow, then again it may be done to maintain pressure( velocity) in
the system - any suggestions ?

One interesting thing with creating your own housings is that you can add
extra bellhousing bolt positions - providing you are making your own
bellhousing as well, OR as Mistral has done include motor mount points. I
must remember to look at that for a possible rear mount!!

George ( down under)

 
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