Help with Dyno2000 set up plz.....
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Help with Dyno2000 set up plz.....

  1. #1
    Senior Member Jim W's Avatar
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    Default Help with Dyno2000 set up plz.....

    I have the Dyno 2000 program.
    Can someone help me to figure out how to do the compression ratios?
    The trouble I am having is when putting in the combustion chamber volume, the program wont accept 114cc. It will accept under 100cc though.
    I must be doing something wrong but don't know what.

    Any help is appreciated.
    Be good, Jim

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    E-7 Sheepdog (ret) SmokinLowriderSS's Avatar
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    Do you have some unusual combination of parts?

    I have no trouble putting 118 to 123cc chambers in a BB Chevy.

    What base engine block?

    I also have no trouble with 385 block Ford or Small Chevy.

    I have another program I use as well, totally separate. Compression Ratio Calculator v2.0 from Performance Trends Inc. (free version downloaded from them online)
    Last edited by SmokinLowriderSS; 01-19-2008 at 10:50 AM. Reason: Aditions

  4. #3
    Senior Member Jim W's Avatar
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    Thanks Smokin...

    I put in BBC on methanol.
    Roots 8-71.

    When I go to the compression calculator, it asks----
    Flat top with no valve reliefs or dome, dish or valve reliefs. I have a dome with a volume of 40cc. So, I clicked that little button.

    I am putting in that the chamber has a volume of 114. Wont accept that.
    Have tried both wedge heads and canted valve. It wont accept anything over 99 cc?????

    I can put the other specs in no problem.

    Piston is down in the bore 0.0.
    Head gasket is .042
    Head gasket dia. is 4.500

    Damned if I know....

    Also. do I limit the boost (15 psi is what I want to run) by changing the drive ratio on the blower until I get it down to 15 psi?


    Be good, Jim
    Last edited by Jim W; 01-19-2008 at 02:53 PM. Reason: more info

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    E-7 Sheepdog (ret) SmokinLowriderSS's Avatar
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    Well, I don't have any trouble entering the figures, perhaps do an uninstall and re-install.

    My copy took 114 cc chambers just fine.

    CR is 13.27:1 (on a 4" stroke, you left out info)

    What it forces you to do on a dome piston is this. Lower the piston into the engine, so the dome is flush or below, and measure cc volume above.

    The other prog. I have is easier all in all, go find a copy of it and download.

    On the blower pressure, you just enter the boost you want. There doesn't seem to be any attached correlation in the program, but as much as I tinker with DD, I almost never have used it on blown detups, so my experience there is limited.

    Besides, belt ratio on the actual engine is a factor of so many things to get 15psi of back-pressure (which is all boost really is). Free-flowing heads will lower boost (all other things equal) so what you can do on DD is to see what happens by then, and then see what the real engine does. Better breathing heads will take a lot more blower speed to get to 15#, worse flowing heads will hit 15# much sooner, at a much different belt drive ratio.

    I need a lot more info to do much of a build on DD.

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    Senior Member Jim W's Avatar
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    Thanks again Smokin....

    I was wondering if the piston had to be down in the bore? I was hoping that at TDC/0 deck it figured for a flat piston and then adding 35cc for the pop up was the way it would work. Wrong again I guess.

    In my forced induction program, it lists "max engine boost" which according to the help section is for a waste gated motor.
    I played with pulley combos but down to 50% under driven I still had 33 some odd lbs of boost. Not the 15 I will be running.

    What other program do you use that I can download?

    Thanks for the 13.27:1 figure. I have to get it down to the 11-11 1/2 range. A crude start but gives me a starting point.

    Be good, Jim

  8. #6
    E-7 Sheepdog (ret) SmokinLowriderSS's Avatar
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    aim for 25cc dome. 11.43:1

    Performance Trends a litany of programs available here, some free (at least trial basis) or restricted untill purchased for full usefulness, like the compression ratio calc. I used here.

    LOTS of cyl head flow data
    just a smattering of what I've dug up the last few years to help me.

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