Matt Gruber

at WOT 5700 had less than 1" vacuum. :sad:

lars

That sounds perfect. Here is a dyno run sheet of an engine I ran a couple years ago. 588 horsepower and 603 lb/ft torque. Highest vacuum reading ever obtained was 1/2" between 5700 and 6000 rpm. The Excel sheet doesn't paste into the Forum format very well, so you have to use your imagination a little to figure out the columns and data (the second to the last column is manifold vacuum... it starts off as 0.0 and stays at "zero" until it finally pulls -0.5 at 5700):


Listing of: (memory data)
Channel Group: Corrected Torque and Power Page 1
Printed on Nov. 2, 2001 16:14:21
Test Description: Accel. Test - 300 rpm/second

EngSpd STPTrq STPPwr BSFC FulA+B WtrOut LamAF1 ManVac Oil P
RPM Clb-ft CHp lb/hph lb/hr degF Ratio inHg psig

3500 575.2 383.2 0.567 193.1 107 13.6 0.0 91.7
3600 574.9 394.0 0.555 194.1 107 13.6 0.0 91.6
3700 579.0 407.9 0.511 185.0 108 13.6 0.0 91.9
** 3800 585.2 423.4 0.481 181.0 108 13.6 0.0 92.5
3900 589.7 437.9 0.453 176.2 109 13.6 0.0 93.1
4000 592.0 450.9 0.438 175.1 109 13.6 0.0 93.5
4100 596.5 165.7 0.422 174.5 109 13.6 0.0 94.4
4200 601.1 490.7 0.416 177.2 109 13.6 0.0 95.8
4300 602.9 493.6 0.416 182.3 109 13.6 0.0 96.6
4400 603.7 505.8 0.416 186.4 109 13.4 0.0 97.1
4500 601.0 515.0 0.419 191.4 109 13.4 0.0 97.0
4600 597.4 523.7 0.423 196.8 109 13.4 0.0 96.6
4700 596.5 533.8 0.423 200.6 109 13.4 0.0 96.1
4800 595.1 543.9 0.423 203.9 109 13.4 0.0 95.8
4900 592.7 552.9 0.425 208.1 109 13.3 0.0 96.0
5000 588.0 559.8 0.435 215.6 109 13.3 0.0 94.7
5100 582.6 565.7 0.436 217.9 109 13.3 0.0 92.3
5200 571.5 565.8 0.443 221.5 109 13.3 0.0 89.6
5300 564.3 569.4 0.439 220.4 109 13.3 0.0 88.8
5400 556.5 572.2 0.435 219.4 109 13.3 0.0 87.7
5500 551.4 577.5 0.443 225.2 109 13.3 0.0 88.5
5600 547.3 583.6 0.454 233.6 110 13.2 0.0 88.3
5700 540.6 586.7 0.465 240.2 110 13.2 -0.5 86.1
5800 532.9 588.5 0.474 245.1 110 13.2 -0.5 87.8
5900 520.8 585.0 0.487 250.3 110 13.2 -0.5 94.6
** 6000 508.9 581.3 0.501 255.2 110 13.2 -0.5 95.2

** Range: 3800 RPM - 6000 RPM
AVG: 4900 574.7 533.2 0.442 208.6 109 13.4 -0.1 93.0
MIN: 3800 508.9 422.4 0.416 174.5 108 13.2 -0.5 86.1
MAX: 6000 603.7 588.5 0.501 255.2 110 13.6 0.0 97.1



[Modified by lars, 10:12 AM 4/7/2004]

isosceles

What kind of carb Matt? I know, I know! Must be one of those Q-jets you love so much! :jester
(yes, I still have mine :rolleyes: )

Matt Gruber

lars
how accurate is the 1.6 cfm/hp rule of thumb? 588 would be 940 cfm. what was that carb?

lars

It was a Speed Demon 850.