Ok, I hate to sound dumb here, but this chart is way over my
        head.  I'm
             sure it provides everything I need to know, but I don't
   know what
             questions to ask of the chart.  To start, is there a problem
        with the
             displacement shown on the turbo spreadsheet?   The spreadsheet
        says that
             the 13B displacement is 159.6 cubic inches.  That sounds
   way to
             high.  I
             looked up the displacement in "cubic centimeters" and
   converted it:
             13B = 1308 cc =  79.788 cubic inches
             20B = 1962 cc = 119.682 cubic inches

             I'm in Dallas and do most of my flying in 90-100 degree F.  My
        field
             altitude is 600ft.  I usually fly under 15k altitude.  I just
        want to
             know how to select a turbo that will help me maintain 350
   hp up
        to about
             18k altitude on those hotter that hell Texas Summer days.  Can
        anyone
             give me the "Cliff Notes" or "Turbos for Dummies" version
             Don

             No Don it is indeed 159 c.i. equivalent. The three rotor
   is 240
        c.i.
             roughly. That is how much air they pump in one rev at 100%
   VE. I
             am not sure which spread sheet you are looking at but it is
        probably
             Dave Leonard's. Can you help Don out Dave?

             You will also need that Turbochargers book Don. I hope you
   save
             messages :)

             Paul Lamar


        Eh yeah, Im not going there... that is too close to the old "is
   it a
        4-piston, 6-piston, or 2-piston equivalent?"  :-)

        Lets just use 159 c.i. and leave it at that  :-)

        (ok, each chamber is used once per rev instead of once every
   other rev
        like in a typical piston engine... so double the equivalent volume)

        --

        David Leonard

        Turbo Rotary RV-6 N4VY
        N4VY.RotaryRoster.net <http://N4VY.RotaryRoster.net>
        www.RotaryRoster.net <http://www.RotaryRoster.net>
        leonardiniraq.blogspot.com <http://leonardiniraq.blogspot.com>

        So you went there after all :)

        Paul Lamar ...No rotor no motor.


   Thanks David.  For the info and for your patients!
   I guess we all have to start somewhere.
   Don



David,
Based on your 20B numbers on the spread sheet, you might want to look at
these two Garrett turbos:

http://www.turbobygarrett.com/turbobygarrett/catelog/Turbochargers/GT40/GT4088_703457_2.htm

http://www.turbobygarrett.com/turbobygarrett/catelog/Turbochargers/GT40/GT4088R.htm

Don



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