I am interested in using two small turbos to boost power on my cozy 4
rx8 engine. It means I might be able to fit them rearward towards the
prop. keeping the heat away from all radiators. So I looked at
Aerocharger stuff again.
Aerocharger sells to our military and shows on their website an aircraft
rotary design using their turbo.
http://www.aerocharger.com/military_app.php
Possibly this is ground covered already, but I haven't seen this unit
discussed here over the past 10 months.
Ed Carver
That looks like a one rotor Midwest/Austro engine. That could also
be an LSA size rotary engine generating 100 HP if the rotor cooling is
adequate.
Clever idea cantilevering the turbo charger shaft.
Bearing heat and lubrication are always issues with
turbo chargers.
Also clever is using SS for the compressor/turbine wheel as it cuts
the heat transfer from the turbine to the compressor. The larger
inter cooler required removes the extra heat. I would think that
would be an advantage if one were trying to run diesel fuel in a
low compression rotary.
Looks like Pandora's box of possibilities.
http://www.aerocharger.com/kits_porsche_930.php
Thanks for uploading that Ed.
Paul Lamar
Hi Paul
Some of the Aerochargers claims appear to be significant.
Boost control, oil supply would seem to make implementation simpler.
I note that the 53 series is good for 340cfm and the 66 series for 540cfm.
Are you easily able to give us what a 13B consumes at a boost of say 14.7psi at
sea level.
Cheers
Steve Izett
Sure. Here are some charts.
Paul Lamar
Thanks Paul
I take it the added Red intersect is 2 rotor and Blue intersect is 3 rotor (I'm
colour blind incase I've got them wrong)
What RPM is the top curve of Fig 2?
And do you have the conversion from mass/min to vol/min given say 25C / 77F.
Cheers
Steve Izett
The first chart with the right angles shows a one rotor 1.3 L and the
2.6 L 2 rotor.
The 2nd chart is new.
The third chart with right angles shows a 2 rotor and 3 rotor at different
boost levels. A 5 psi boost would be about 200 HP for a 2 rotor side port
at around 6000 RPM. 10 psi boost would be about 250 HP at sea level.
30 inches of Hg is about 15 psi. So 5 psi boost is 40 inches of Hg and 10 psi
boost is 50 inches of HG. Air consumption and therefore power is directly
proportional to Hg. Of course a 3 rotor is 150% of a two rotor.
Paul Lamar
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