Paul is the RX8 happy to be turbocharged? Should and can the
compression
   be reduced easily. Could the rotor have a little of the convex shape
   shaved off to reduce compression? Or the bowl enlarged?
   Mark Dillner

   If you put Ianetti ceramic apex seals in it you don't need to reduce
   the compression ratio. The stock apex iron seals can run up to 500 F at
   their center. That can go much higher when boosted and may fail
   the seal.  The ceramic seals will go to 1000 F.

   The same material is used in ball bearings that are good to 1000 F
   while steel ball bearings have a 500 F limit. Most ball bearings in
   F1 race cars are ceramic.

   In that case we have seen 85 inches of Mercury manifold pressure
    so far with no damage. Something like 700 HP. The Wankel is amazing!

   Paul Lamar

   An air cycle turbo expander. Cool idea made into hardware; English, not
   American.
   Murry Rozansky



   "A turboexpander, also referred to as a turbo-expander or an expansion
   turbine, is a centrifugal or axial flow turbine  through which a high
   pressure  gas  is expanded to produce work that is often used to
drive a
   compressor "

   Are you suggesting this be used to cool the apex seal?

   Paul Lamar



   It is a more effective way to charge cool a high boosted engine and
would
   reduce internal temps while allowing higher boost.  It is a
turbocharger
   intercooler, if you will.  They claim outlet temps below ambient.
For short
   duration, water injection is simpler.
https://www.aircycletechnology.co.uk/
<https://www.aircycletechnology.co.uk/>
   I forgot link?
   Murry Rozansky

   Where does the HP come from to compress the air?
   In other words what is the BSFC?

   Paul Lamar


   The turbine of the charge cooler runs off of excess boost on the
inlet side
   of the engine. Instead of wasting exhaust energy of the engine with an
   exhaust wastegate after the intercooler on the compressor of the
turbo the
   air is compressed more in the turbo compressor then goes through
another
   charge cooler then to the turbine of the turbo cooler where it
expands more
   and drops further in temp before going to the engine. It is an aircycle
   cooling unit like used on jets for AC running on bleed air. There is a
   graphic on the web site. Click on box at bottom of home page. I do
not think
   it would effect BSFC much directly but would allow downsizing
and/or down
   speeding for a particular output and it runs off energy that would
go out
   the tailpipe. More energy  would be in the exhaust for turbocompounding
   because of the higher boost level..

   Murry Rozansky

   For the new people charge cooling refers to how the rotor and
   the rotor bearings are cooled. The mixture is passed through
   the rotor first to cool it and then into the compression chamber.
   The mixture is heated so less mass of air and fuel makes
   its way into the engine.

   This drastically affects the volumetric efficiency because of the
aerodynamic
   considerations and therefor reduces the HP generated for a given
   engine displacement.

   The bottom line is the BSFC.  The pounds of fuel
   burned per HP generated.

   What is it?

   The ceramic apex seal reduces or eliminates the need to cool it.
   Are they running ceramic apex seals?

   The oil cooled rotor reduces the temperature of the apex seal slot.
   That is part of the apex seal cooling.

    Here is some data on apex seal cooling.

   Paul Lamar

My take on the dissertation is that air bleed like used on turbine
engines is used to control boost pressure. One problem I can see with
that is possible overspeed of the turbine which could have catastrophic
results. Using a wastegate and putting that back into the exhaust going
through an axial flow power recovery turbine makes more sense to me.

Dale Davies

Hi, it is a turbocharged intercooler system for conventional turbocharged
engines. It is not intended for rotary charge cooling but might be useful
for that.  The turbocoolers turbine is powered by boosted intake air which
drops in pressure and temperature going through it.  They claim sub ambient
temp air to the intake manifold.

Murry Rozansky

Do you have any links on this Murry?

Paul Lamar


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