Can someone please do a desktop dyno of my vette? Here is some info, please let me know if it's not enough. Thanks!

383 Stroker
Holley Systemax II Package: http://www.holley.com/HiOctn/ProdLin...K/300-503.html

This is from Holley's site:

CAM:
Intake Valve Lift/Duration: .473"/290° @ .006"
Exhaust Valve Lift/Duration: .488"/297° @ .006"
Valve Overlap: 73.5° @ .006"
Rocker Arm Ratio: 1.5
Intake Lobe Centerline: 105°
Exhaust Lobe Centerline: 115°

Heads:
Rectangular-shaped exhaust ports in stock O.E. locations.
Intake and exhaust valve angles changed from 23° to 20°.
Combustion chamber volume: 66 cc.
Intake runner volume: 185 cc, flowing 228 SCFM @ .500" valve lift.
Exhaust runner volume: 68 cc, flowing 162 SCFM @ .500" valve lift.
Rocker arm ratio: 1.5:1

Valves: One-piece forged from 21-4N stainless steel with stellite tip and chrome-plated stem.
......Intake - 2.02" diameter
........................4.92" length
........................11/32" stem diameter
......Exhaust - 1.60" diameter
........................4.94" length
........................11/32" stem diameter

Valve Springs: Dual, with dampener
......Diameter - 1.430"
......Seat Pressure - 132 lbs.
......Open Force - 310 lbs. @ .500" lift

Valve Seat Angle:
......Top - 35
......Middle - 45
......Bottom - 60

Valve guides are made of phosphorous/bronze.

Valve Keepers: 7°, steel.

Straight spark plug design.

Spark plug type: Champion C61C
........................14mm, 3/4" reach,
.........................040" gap or equivalent

I apologize for the spam, but I don't know what is needed for the software to provide accurate results. I can provide more information on my vette if necessary to get a more accurate output from desktop dyno. Thanks!! :seeya

 

Need more benchflow numbers at varying lifts. i.e. .200, .300, .400, .550, .600, .650

These are needed to get a relatively accurate guesstimate. Maybe Holley can provide them.

What carb? 750 cfm?

What intake manifold? dual plane or single plane?

Exhaust? Headers? If so, what size?

 

dosen't someone near you have a G-Tech Pro? if you hit a group purchase, they are less than $120.....
much faster, more accurate answer..... to the hundreth place that is....
i.e. 483.54 rwhp
:yesnod:

 

Here is the rest from Holley's site:

Hydraulic Camshaft and Lifters
Aluminum Dual Plane Intake Manifold
Double Roller Timing Chain and Gears
Fully Assembled Aluminum Cylinder Heads
Hardened Push Rods
ARP Cylinder Head Bolts
Assembly Lube

Here is more info:

400 Steel Forged Crankshaft
Aluminum Heads
Double Roller Timing Chain & Gears
Hydraulic Camshaft
Powder Coated Hooker Super Competition Headers
Chambered Flowmaster Mufflers with 2.5” Pipes
Crane Gold Series Roller Rocker Arms
MSD 6A Ignition & Blaster
Holley 750 Double Pumper
HEI Distributor

Here is something that might help. It looks to be a piece of paper when the 350 was bored out? I'll try my best to copy what is on it:

Lift:
Rocker arm ratio = 1.50
Intake @ CAM = 315 ..... @ valve = 473
Exhaust @ CAM = 325 ..... @ valve = 488

CAM Timing .................. Opens ................ closes ...................... advertised duration
@ .004 ................................ 37.0 BTDC .............79.0 BDTC .............................. 296
TAPPET Lift .........................81.0 BBDC ..............43.0 ........................................ ... 304

CAM Timing ................ Opens ................. closes ...................... max lift ................ duration
@ .050.................. Intake 12.0 BTDC ...............42.0 ABDC .................105 ATDC ............234
TAPPET Lift .............Exhaust 56.0 BBDC ............. 6.0 ATDC ................... 115 BTDC ............ 242

As you can clearly see, I'm a rookie. Thanks Mako, hopefully this is what you needed?


[Modified by FroDaddy, 11:56 PM 10/16/2001]

 

Go to http://www.chevyhiperformance.com . Click on link for Cyber Flow To Go (something like that). Has all the flow numbers for all the heads that Chevy High Performance mag has ever tested. Got to search a little but very good info.

Good luck

 

Thanks alot SteveG75! Hopefully someone can do a desktop dyno for me now that I have more information:



These are the stats for the SystemMax one package, but the heads are the same on that package and the package my Vette has (the systemmax2).

Thanks!!


[Modified by FroDaddy, 9:11 AM 10/17/2001]

 

ttt

 

I may be wrong, and I don't know what your compression ratio is so I plugged in 10:1, but as far as I can tell your peak HP comes in at 5500 RPM's and is 371 and your peak torque is 404 lb/ft at 4000 rpm's. This is of course according to Desktop Dyno 2000, so it is not extremely accurate. Maybe someone out there can check my numbers.


[Modified by 79MakoL82, 5:10 PM 10/17/2001]

 

That seems really low. The compression is 10:1, but maybe I didn't get the right specs on the headers. Holley says their systemMax is about 425 ft/lb on a 350, so the NCRS judge who built it estimated about 450+ on the 383. Thanks for helping 79MakoL82, even if I didn't get the #'s I was expecting. I really appreciate you taking the time to do that for me. :yesnod: :seeya

 

Mako, were your numbers for RWHP/TQ?? Or were they at the motor?