Desk Top Dyno
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Lead Driver
Joined: Nov 2000
Posts: 6,640
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From: Albuquerque
Desk Top Dyno
Finally bought a copy of Desk Top Dyno and ran my engine numbers.
H.P. = 527 @ 6,000rpm
Tq. = 511 @ 4,500rpm
Toruqe number stat at 2,000rpm @ 432 and stay above 450 till after 6,000rpm.
:-staun
Yikes! I didn't expect that much. I did use real cam numbers etc. so as far as the program it should be accurate. Too bad they closed the dad gum drag strip.
Guess I'll have to get out the old timing computer,stick it on the windshield and see if I can knock it off there.
Bear Tracks
H.P. = 527 @ 6,000rpm
Tq. = 511 @ 4,500rpm
Toruqe number stat at 2,000rpm @ 432 and stay above 450 till after 6,000rpm.
:-staun
Yikes! I didn't expect that much. I did use real cam numbers etc. so as far as the program it should be accurate. Too bad they closed the dad gum drag strip.
Guess I'll have to get out the old timing computer,stick it on the windshield and see if I can knock it off there.
Bear Tracks
Posting Legend
Joined: Sep 2001
Posts: 30,255
Likes: 37
Desk Top Dyno
You might want to get their book on "Desktop Dynos, Using Computers to Build and Test Engines". The book has a lot of information on using the program properly. Your roller cam is probably throwing your numbers off. I seem to remember some special considerations when using those. I can also suggest correlating your dyno assumptions with other known engines (with actual dyno readings) using similar setups to see if your numbers come out close. You may try using some of the 5.0 setups with aftermarket heads.
Junior User
Joined: Jan 2002
Posts: 79
Likes: 1
From: Chelsea United States
Desk Top Dyno
Don't forget to input proper airflow numbers as well. Each of the head selestions Desk Top Dyno provides has it's own individual airflow file attached. You should check these against what you are actually flowing. Modify as needed or create a custom Airflow File for your personal heads. This is an important factor as well in determining power output. I think alot of people get awesome power numbers due to choosing "head files" that flow way more than their actual heads do. This is one of the biggest reasons people think DD2K is too "optimistic". There, that's my two pennies for the day! - Don
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Joined: Sep 2001
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From: Jax FL
Desk Top Dyno
[updated:LAST EDITED ON 06-Mar-02 AT 01:40 PM (EST)]The real problem with dd2k is the canted valve head profiles is for a Chrysler. I called them up and they didnt even know there weere a few different types of cleveland heads. The tech support guy said that they were not going to make any more profiles, and that no one was really interested in building outdated engines anymore.
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Lead Driver
Joined: Nov 2000
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From: Albuquerque
Desk Top Dyno
[updated:LAST EDITED ON 06-Mar-02 AT 03:09 PM (EST)] I hear you guys and thanks for the input. I did use real cam numbers and a conservative head profile. My heads have been pocket ported and matched and have stainless valves. The Performer intake was also port matched.
The numbers are a bit optimistic but I was expecting about 450hp. Peak HP was shown at 6,000rpm and I haven't pushed passed 5,200 yet. Their number was still about 510hp at 5200.
I have seen post here from people who used a real dyno and DT2000 and got very accurate readings.
Anyway it's an interesting toy. Need to learn more about it.
Oh yeah, the cam has .560/.580 lift and 216/224 duration. You should have seen the square lobes on that sucker.
Thanks,
Bear Tracks
The numbers are a bit optimistic but I was expecting about 450hp. Peak HP was shown at 6,000rpm and I haven't pushed passed 5,200 yet. Their number was still about 510hp at 5200.
I have seen post here from people who used a real dyno and DT2000 and got very accurate readings.
Anyway it's an interesting toy. Need to learn more about it.
Oh yeah, the cam has .560/.580 lift and 216/224 duration. You should have seen the square lobes on that sucker.
Thanks,
Bear Tracks
Elder User
Joined: Sep 2001
Posts: 887
Likes: 1
From: Jax FL
Desk Top Dyno
another tip for using dd2k, always use the @.050 for cam. the seat to seat option is leass reliable. According to the users guide, a 1 7/8 ehaust is a large exhaust.
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Lead Driver
Joined: Nov 2000
Posts: 6,640
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From: Albuquerque
Desk Top Dyno
I did a little fine tuning. Had the valve sizes slightly too large made a big difference. Also changed the cam specs to @.050 and that made a big difference too (?).
now getting a more realistic:
H.P = 414 @ 5,000
Tq. = 529 @ 3,000
Seat of the pants tells me 440hp @5,500rpm would be closer but.......
Nice torque though. 525# starting at 2,000rpm
Hymm, question, questions, questions.
Bear Tracks
now getting a more realistic:
H.P = 414 @ 5,000
Tq. = 529 @ 3,000
Seat of the pants tells me 440hp @5,500rpm would be closer but.......
Nice torque though. 525# starting at 2,000rpm
Hymm, question, questions, questions.
Bear Tracks
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From: PacNW
Desk Top Dyno
I used the flow numbers from the [link:www.waldens.com/waldens/351heads.htm|Waldens site] when I ran my engine on DD2K. I did add a few cfm from the stock since I pocket ported, gasket matched & polished my heads. I think they even have numbers for the 2V heads with 4V valves on that site.
Elder User
Joined: Sep 2001
Posts: 887
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From: Jax FL
Desk Top Dyno
glad to see you got closer to a realistic number. the have a pdf guid file on the cd and you can d/l the updated one from motion software.
as to what parts i used
400 block
1970 351 4v heads
1971 flat top pistons
2.19/1.171 vavles
crower 390 cam @050 227/233 .550/.547
wieand xcelerator (stealth) 3514v intake
750 deamon carb
cr is 11.76
headers by hooker - gonna ger 2 inch custom
wieand spacers
rest is stock.
as to what parts i used
400 block
1970 351 4v heads
1971 flat top pistons
2.19/1.171 vavles
crower 390 cam @050 227/233 .550/.547
wieand xcelerator (stealth) 3514v intake
750 deamon carb
cr is 11.76
headers by hooker - gonna ger 2 inch custom
wieand spacers
rest is stock.
