Paul,

    I'm glad you haven't posted the earlier versions I sent you.

    I've made some important tweaks, including factoring in the effect of
    compression ratio on thermal efficiency.

    Here is version 3.6. Feel free to distribute this one, if you wish.

    Regards,

    Gordon.

    PS: Look at that bsfc at 12,000 altitude with turbocompound: 0.36!

    -------------------------------------------------------------

    Still wrong Gordon. It is 2.6L and not 1.3L
    The 1.3L will not pump the required air. See the last chart..

    Paul Lamar ...No rotor no motor.

    Paul,

    I wish you wouldn't keep saying it's wrong. It's perfectly accurate.

    Look at your chart and then plug in the same rpm  and VE numbers
    into my spreadsheet. You will get 234 cfm. Exactly what your chart
    shows.

    Anyway, I'm giving in to your pet peeve and I'm adding equivalent
    displacement. So now there is both.

    Here is version 3.8. I've done some more minor improvements.


    Regards,

    Gordon.



When you enter an actual displacement of 2.6 L equivalent displacement becomes wrong.
Your formula for equivalent displacement is obviously wrong.

The volumetric shown  efficiency is also too low. It should be at least 100% for a side
port and 120% for a P-port.

Here is what you get with a VE of 115% on gasoline which correlates
well with what people are getting out of turbocharged 13Bs.

Also a BSFC of .42 is pretty good at sea level for the turbo compound
with a TIT of 1750 F.

Congratulations. Other than the minor problem with the equivalent displacement :)

Paul Lamar ...No rotor no motor.

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