Sometimes the large measurement of the compressor wheel is refered to as the exducer as in the specifications at the top of the Compressor Map shown by 93 R1. Its a little inconsistent.



Fully explaining compressor maps takes a while. If I get a chance I'll write some stuff on it.

Here's a nice pic..

#2

1. The ground radius on the hub diameter creates a pressure differential to prevent oil transfer through the seal



2. The piston rings seat in the seal bore and form a vital element of the air/oil seal



3. The thrust cooler turns at shaft speed, oil is pumped out of the seal cavity through the drilled holes in the collar.





4. This seal land surface helps prevent oil from entering the seal bore





5. The higher pressures of the compressor air and turbine exhaust gases serve to prevent oil leakage through the seals

more

my turbo

Now if you could explain the last 2 pics.



Is the pressure on the vertical axis measured in BAR? Whats p1/p2?

Sorry I havn't had time to write some crap on compressor maps, but to hold you over I'll tell you what the pressure ratio part means.



Pressure Ratio = P1/P2



P1 = Boost pressure + Atmospheric pressure

P2 = Atmospheric pressure (approx 1Bar or 15psi at sea level)



So with no boost P1 = P2 and the Pressure Ratio = 1

With 1Bar of boost P1 = 2Bar so PR = 2

2 Bar of boost gives PR = 3

you get the picture. https://www.nopistons.com/forums/pub...IR#>/smile.png

good stuff little rotor https://www.nopistons.com/forums/pub...1047683894.gif

read maximum boost by corky bell

its the book for turbocharging, it will tell you anything you need to know