Don Terrill’s Speed-Talk

260 CFM air flow

1.8 sqin CSA - Average Air Speed 346.7 fps

1.9 sqin CSA - Average Air Speed 328.4 fps

2.0 sqin CSA - Average Air Speed 312.0 fps

2.08 sqin CSA - Average Air Speed 300.0 fps

Stan

PipeMAX calculates VE differently than a dyno. After building several TPI engines on PipeMax and DynoSim6, I am confident this is about at accurate as can be. Richard Holdener did 372hp and 465ft lbs with the same intake parts and AFR heads. 385hp is the goal. Rob, Did the program calculate this BS...

Kevin,
The program is not an engine simulation program. The 6000 RPM you enter is an input. The wave turned length / RPM is just a separate calculation.

Stan

PipeMAX calculates VE differently than a dyno. After building several TPI engines on PipeMax and DynoSim6, I am confident this is about at accurate as can be. Richard Holdener did 372hp and 465ft lbs with the same intake parts and AFR heads. 385hp is the goal. Rob, Did the program calculate this BS...

Carnut1 wrote: ↑Sun Apr 21, 2024 8:08 pm 144 ve? Sounds optimistic

Charlie,
The older 3.9x versions of PipeMax wouldn't let you enter anything higher than 135% VE

Stan

BP758 wrote: ↑Tue Apr 16, 2024 9:29 pm

vortecpro wrote: ↑Tue Apr 16, 2024 12:06 am Larry has certainly contributed to my program that's for sure.

The last 496 you built was stout! Told Steven I can put it in for a run or two....
I'll be on the pump next week and call you.

Barry,
How light can you be, if you don't have to be class legal?

Stan

Larry, What are you using for Cd and FA? I long time ago I found somewhere on the internet. 70 Chevelle .42 Cd 25.52 FA Stan i did a very quick Simulation for Mark's 650 HP ... i didn't fine-tune it or nit-pick it however, i came out pretty close to reality :) VortecPro_DragCoefficient_FrontalArea....

maxracesoftware wrote: ↑Mon Apr 15, 2024 12:57 pm .... this would be an "Ideal Run" that would show 650 Peak HP with a very flat TQ and HP Curve
something to shoot for !

VortecPro_Ideal_Run_650HP.png

 

Larry,
What are you using for Cd and FA? I long time ago I found somewhere on the internet. 70 Chevelle .42 Cd 25.52 FA

Stan

I used 3500 and guessed at a few things. 60 Foot ET = 1.3451 330 Foot ET = 4.0295 1/8 Mile ET = 6.3696 1/8 Mile MPH = 104.4593 1000 Foot ET = 8.4108 1/4 Mile ET = 10.1480 1/4 Mile MPH = 129.8599 In better air close to DA = 0 60 Foot ET = 1.3132 330 Foot ET = 3.9323 1/8 Mile ET = 6.2165 1/8 Mile MPH...

I used 3500 and guessed at a few things. 60 Foot ET = 1.3451 330 Foot ET = 4.0295 1/8 Mile ET = 6.3696 1/8 Mile MPH = 104.4593 1000 Foot ET = 8.4108 1/4 Mile ET = 10.1480 1/4 Mile MPH = 129.8599 In better air close to DA = 0 60 Foot ET = 1.3132 330 Foot ET = 3.9323 1/8 Mile ET = 6.2165 1/8 Mile MPH ...

als427 wrote: ↑Sun Apr 14, 2024 5:23 pm ok fair enough , does a 155-170 gove an indication of engine health either way and suitability for the street? or is it all %^$£

That tells you nothing by itself about engine health. What is your CR and IVC (seat-to-seat @ the valve).

Stan

The car: My 1968 Chevelle, T350 4.56 gear, (not optimum) 30x9 radial slick. Exact weight will be posted when I run across the scales Sunday. The results from the first lackluster test were: 10.50 @ 124.5 140 60 foot, 6.61 660 @ 102 MPH #-o Same engine this time drag tested in different conditions. ...

vortecpro wrote: ↑Sun Apr 14, 2024 11:16 am I should mention the 496 in my test makes 650 STP corrected HP @ 6200 RPM.

Do you have a dyno sheet you can post? I was going to do a few simulations, this is what I have for your 496 from a few years ago.

Stan

Topsp33d wrote: ↑Thu Apr 11, 2024 10:41 am What about the ivc? Is it of no consequence? I have smaller cams, one I like is 66* (seat ivc). What if I retard that 4 degrees?

66* ivc retard that 4 degrees is 70 ivc, which should raise your DCR about .3 of a point.

Stan

HQM383 wrote: ↑Wed Apr 10, 2024 1:01 am Is the an IVC of 74* at .050"?

Could be at the seat-to-seat

Stan

PS - An example - 292 intake @ 108 ICL 38/74