Desktop Dyno / Dyno2000 U20

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Desktop Dyno / Dyno2000 U20

Post by timurf » Tue Feb 05, 2019 9:38 am

Has anyone out there populated the Dyno2000 simulator with the U20?

I'm about to do this myself, but due to chronic laziness, I wonder if someone already has the dyn files that I can steal and use for my own filthy pleasures.

Without having actual flow numbers I don't expect to get accurate results, but still want to use it to play around with relationships between cams and valve sizes, etc.
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Re: Desktop Dyno / Dyno2000 U20

Post by SLOroadster » Tue Feb 05, 2019 4:00 pm

I played with it a million years ago, but haven't touched it in years. Do you have a link for a new version of it? (I think my version was windows 2000 or XP)

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Re: Desktop Dyno / Dyno2000 U20

Post by timurf » Wed Feb 06, 2019 8:37 am

Hi Will,

The version I downloaded is from 2001. Oldie but a goodie! But seems to run fine on Windows 10. There is probably a newer version but why bother if the old one works.

Did you save any of your old work?

I can probably find the link if you don't have this version. let me know.

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Re: Desktop Dyno / Dyno2000 U20

Post by Pjackb » Wed Feb 06, 2019 5:26 pm


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Re: Desktop Dyno / Dyno2000 U20

Post by Gregs672000 » Thu Feb 07, 2019 4:28 pm

timurf wrote:
Tue Feb 05, 2019 9:38 am
Has anyone out there populated the Dyno2000 simulator with the U20?

I'm about to do this myself, but due to chronic laziness, I wonder if someone already has the dyn files that I can steal and use for my own filthy pleasures.

Without having actual flow numbers I don't expect to get accurate results, but still want to use it to play around with relationships between cams and valve sizes, etc.
My friend Steve may have some flow numbers for a stock U20 head as well as mine through various modifications. If it would be helpful, I will see if he can get me some numbers to play around with. If so, be patient as he's a very busy guy (and he may poo poo all of this... he has little belief in such things and might say "Greg, get off the Damn internet!"). I will see what I can do. :D
:smt006
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Re: Desktop Dyno / Dyno2000 U20

Post by timurf » Fri Feb 08, 2019 9:07 am

Tim Murphy

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Re: Desktop Dyno / Dyno2000 U20

Post by timurf » Fri Feb 08, 2019 9:14 am

Gregs672000 wrote:
Thu Feb 07, 2019 4:28 pm
timurf wrote:
Tue Feb 05, 2019 9:38 am
Has anyone out there populated the Dyno2000 simulator with the U20?

I'm about to do this myself, but due to chronic laziness, I wonder if someone already has the dyn files that I can steal and use for my own filthy pleasures.

Without having actual flow numbers I don't expect to get accurate results, but still want to use it to play around with relationships between cams and valve sizes, etc.
My friend Steve may have some flow numbers for a stock U20 head as well as mine through various modifications. If it would be helpful, I will see if he can get me some numbers to play around with. If so, be patient as he's a very busy guy (and he may poo poo all of this... he has little belief in such things and might say "Greg, get off the Damn internet!"). I will see what I can do. :D
:smt006
Thanks Greg, I have time. I'm not even sure how much I'll use the simulation results to influence my rebuild choices. But still curious to experiment with modelling.

Maybe I should learn my a$$ how to use the flow chambers at work?
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Re: Desktop Dyno / Dyno2000 U20

Post by timurf » Tue Mar 05, 2019 11:57 am

Been playing around with Dyno2000 and entered several flow test files from the 'How to Hotrod & Race your Datsun' book, including a smogged L20B and two ported heads.

While I wouldn't exactly take the results and go painting HP numbers on the hood, it is certainly a learning experience to experiment with it. To be sure, the model probably contains a number of simplifications that limits its sophistication. Maybe the most tell-tale sign of inaccuracy was that I was able to come up with some volumetric efficiency figures close to 100%. Yeah right, wouldn't *that* be nice...

I might spring for the latest version of the software sometime soon. In the meantime, if anyone wants the .flw files or the .dyn files I am happy to share them.
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Re: Desktop Dyno / Dyno2000 U20

Post by 2mAn » Tue Mar 05, 2019 1:58 pm

I have stock U20 flow numbers in my thread, very recent posts

edit: here you go

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Re: Desktop Dyno / Dyno2000 U20

Post by timurf » Tue Mar 05, 2019 3:57 pm

Thanks Simon! Sorry that I missed this being posted recently. (Amazing how many posts occur in a month when you aren't paying attention.)

Do you know what pressure these flow points were taken at? 25" of H2O is commonly used.
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