Desktop Dyno
 

A friend of mine ;) has some numbers to run through a DD can somebody run them?

Craig

Sure. post everything about the engine and exhaust plus the cam card information (lift, lifter type and valve opening/closing degrees) and I'll run it.

Can the DD2000 run a blower motor combo?

What about this package:

MarkIV 454 .060 over

GM cast iron rectangle port heads

8.25:1 comp.

671 blower/Superchiller 750 Holleys

Comp Cams hyd roller CB3376/3377 .613 intake/.613 ex
[email protected], 240in/250ex 114 lobe separation

CMI headers

Thanks!!!!!

Kurt

1600 hp, a gazillion ft.lbs. of torque,,,,,,,,,,,,
just kidding. can you give me the cam card specs? If not, get me the intake c/l. I also need the belt drive ratio to get accuracy.

I do not know the blower pulley specs but I am running 8 lbs boost.

The cam card I have right here, the duration @.006 tappet lift 295 in/305ex

open close
valve timing at .050 int: 6 btdc 54 abdc
ex: 59 bboc 11 atdc


these spec for cam installed at 114 intake center line

duration at .050 240in 250ex

lobe lift .3610in .3610ex

lobe separation 114.0

Thanks Crazyhorse!

Biggus, you're going to think these numbers are crazy. 760hp@7000, 659 tq@5500. That's figuring 50% efficiency on the intercooler and 1:1 belt drive. You're probably underdriving the blower so a .8 would probably be more realistic.

Yikes! :eek:

What does it read at 5800rpm?

Thanks again Crazyhorse!


Kurt

CrazyHorse,
You have a PM. Sorry about sending it twice! AOL:hothead: at home and it didn't recognize that it had been sent.

Craig

That's alright.

here are the number I got differnt not sure why

4.31 bore 4.00 stroke
GM990 heads with 2.19/1.88 valves ( flow #'s from chevperfmagazine)
CR 8.25:1
750cfm carb
forced ind Roots 671 blower 55% eff boost limit 8psi
belt ratio 1.00 intercooler eff 50%
Small tube headers no mufflers
hyd camm using seat to seat of 295/305 on 114 lift .613/.613
( i also tried the .050 numbers and the program showed little less power that way)

sorry about all the decimal places that just what the program does

RPM___HP________Torque
2000 172.336670 452.383759
2500 246.643356 517.951050
3000 314.141876 549.748291
3500 382.473511 573.710266
4000 443.624512 582.257141
4500 498.340942 581.397766
5000 538.593140 565.522766
5500 543.517090 518.811768
6000 505.358521 442.188690
6500 484.891754 391.643341
7000 440.246948 330.185211

ursus,

Thanks for your input. I have two 750 Holleys on the blower. Could you run it again?

Thanks,

Kurt

oops I missed the s on holley(s)

using 1500 cfm I get

2000 172.996201 454.115021
2500 248.455521 521.756592
3000 317.859802 556.254639
3500 389.035797 583.553711
4000 454.539612 596.583252
4500 514.184937 599.882446
5000 559.387329 587.356689
5500 567.363281 541.574036
6000 528.250244 462.218994
6500 505.860962 408.579987
7000 461.778625 346.333984
7500 407.747681 285.423370

Ursus, did you run it as a hydraulic roller cam?

I changed to the street blower, ran some different airflow numbers and went with a .7 underdrive on the blower and still came up with 683hp@6000, 658tq@4500

How about a
Gen VI 502
9.4 CR
Stock Rectangular port heads
Dart Single Plane
Holley 800
Gil Mag Choice w/diverters
Crane 169611 576 intake @ 105 CL and .598 exhaust

And could you run it again for 109 intake CL

Head Flow

http://www.chevyhiperformance.com/techarticles/41598/

Cam Card for 169611 http://dab7.cranecams.com/SpecCard/D...1=Display+Card
Thanks!:D

With a hydralic roller

2000 185.641800 487.309723
2500 267.919342 562.630615
3000 343.757019 601.574829
3500 421.436676 632.155029
4000 496.125671 651.164917
4500 564.624573 658.728638
5000 618.878601 649.822510
5500 634.452454 605.613708
6000 594.186096 519.912842
6500 572.758362 462.612549
7000 526.272583 394.704437
7500 470.137360 329.096130

p.s.
Head flow #'s I used for gm990's off chevperfmag site
.1 69 53
.2 125 101
.3 183 134
.4 233 163
.5 264 180
.6 292 185

Note DD's prediction of what a combo will produce can be fairly accurate or is sometimes off quite a bit, it is best at comparing what happens when you change one parameter like the CL

@105
2000 202.067566 530.427368
2500 268.073578 562.954529
3000 330.330231 578.077942
3500 392.854523 589.281799
4000 445.697266 584.977661
4500 476.648682 556.090149
5000 479.300690 503.265717
5500 460.536438 439.602966
6000 415.056854 363.174744
6500 378.486206 305.700378

@109
2000 200.219589 525.576416
2500 263.437439 553.218628
3000 324.747437 568.307983
3500 388.253876 582.380798
4000 443.560852 582.173645
4500 480.268860 560.313660
5000 493.868500 518.561951
5500 472.292175 450.824371
6000 440.366516 385.320709
6500 403.910522 326.235413

I got 830 hp at 5500 on 116 octane with a 85 % eff intercooler! All on "Engine analyzer v3.0".

Why would you run 116 octane with a CR of 8.25:1 and 8 psi of boost, that would prob run on 87, but certainly 91 would be enough, it would make less power with 116

ursus
 

My program uses correction factors for air temp, humidity and barometric pressure. At the SAE 60o air etc. it detonated on 93 octane. It will run fine with 90 degree air and 80% humidity with 93 octane, but horsepower was down 100.

BTW, 800 hp is a better number, I made a mistake on the input data. John B

Try running this combo for me!!
 

598" BBC (4.600 X 4.500), naturally aspirated, 10:1 compression ratio, Dart 355 Pro 1 CNC heads, solid roller cam 264/270 duration at .050", .711/.721 net lift on 114 + 4 installation. Carb is a 1500 CFM Holley Dominator, exhaust is full runner header like a CMI Tube Top with 32" runners and full MSD ignition. Intake is a match ported Dart single plane.
Thanks,
Craig

You need to post the cam timing events for us to run the program.

Here are the .050" cam timing points with the cam installed on 110*. IO 22 BTDC, IC 62 ABDC, EO 73 BBDC, EC 17 ATDC. Do your dyno programs actually have Dart 355 CNC ported heads?
Thanks,
Craig

Here is a screen shot of the pics on heads Wette Vette. The airflow file is really a necessity from my limited experience because heads make such a huge difference in results.

Dave

My program shows 700 to 765 depending on the eff. of the heads. My program doesn't have the 355 cnc so I used ported 360's for the higher number. Peak was in the 55-6000 range.

John B

I have the Dyno 2000 and think it needs more specs stored in the program so that the user can jump around with different actual mfg part specs without entering alot of info. BBB