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Old 01-15-2003, 09:20 AM
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Unhappy How many ponies? what cam..

i have downloaded a PC dyno program but it isnt really cooperating. i am trying to figure the horsepower difference (and thereby which one i am going to run) between two solid roller cams but my setup isnt really standard, so if anyone would care to try here are the specs:

Chevy big block
bore: 4.31
Stroke: 4
displacement: 466.9 cui
intake: 8 stack injection, 8*(2-7/16 butterflies)
electronic fuelinjection.
stacklength: 22 inches
compression:11.4:1
Cylinderheads: AFR, CNC 315 runners
intake flow: 390@.700 lift
exhaust flow: 300@.680 lift
headders: 2 inch primaries,
(equal length 38' tubes)
exhaust: dual 3,5 inch

cam#1 Comp 288AR: 246@.050 .623 lift 110LS
cam#2 Crane 13sr0001: 254I/262E@.050 .636 lift 110LS
both are mechanical rollers.

the car will weigh in about 3100 includeing driver and gas, rearend ratio is 3,73 and tranny is 700R4, what 1/4 mile times should i expect on 28 inch tires??

i would really like all the input on this one guys and girls..

[ January 15, 2003: Message edited by: deuce_454 ]

[ January 15, 2003: Message edited by: deuce_454 ]</p>
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Old 01-15-2003, 09:52 AM
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i dont get it, my F.. dyno software keeps changing the cam specs so the numbers are totally worthless... anyone with a program that works better?
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Old 01-15-2003, 11:07 AM
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just realized i posted the wrong flow numbers, the flow is:
380cfm @.600 lift intake
296cfm @.600 lift exhaust

and what would the power drop be if i dropped compression a little to 10.5 or 11, we get 98 octane in the pumps here at select gas stations so i should be ok with the big cam and aluminum heads.. should'nt I ??

[ January 15, 2003: Message edited by: deuce_454 ]</p>
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Old 01-15-2003, 12:33 PM
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On Desktop Dyno with 11.5:1 the 246 @ .050 , 623 lift cam makes more hp then the other. 543 hp @ 5500 rpm , 604 torque @ 4000 rpms
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Old 01-15-2003, 12:44 PM
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thank you tracy, although its about 100 horses short of my goal, <img src="graemlins/pain.gif" border="0" alt="[pain]" /> what the heck can i do differently to get into the 650 range, i mean the stack injection manifold alone was close to 1400 bucks with the EFI, injector bungs and fuelrails...

ps i liked my program better, it said 680, but when i went through the numbers all sorts of things had changed from what i set them to
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Old 01-15-2003, 01:34 PM
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Cool

ARE YOU USING DESKTOP DYNO 2000? IF NOT IT IS WORTH ITS WEIGHT IN GOLD! AND YOUR COMPRESSION SHOULD BE O K WITH YOUR ALUMINUM HEADS BUT CHECK YOUR CYLINDER PRESSURES ONCE YOU ASSEMBLE YOUR ENGINE. THIS WILL DETERMINE WHAT OCTANE YOU WILL NEED.185LBS OF PRESSURE IS THE HIGHEST RECOMMENDED FOR PUMP GAS{93OCTANE}SO IF YOU CAN GET 98 OCTANE I WOULD ESTIMATE AROUND 210 PSI.
THE DYNO CAN'T COMPENSATE FOR CYLINDER PRESSURE BUT THE CAM CAN BY GETTING A CAM WITH A WIDER LDA PRESSURE DECREASES.BUT YOU ARE SACRIFICING LOW END RESPONSE BUT 106-110 LDA's ARE GOOD. <img src="graemlins/pimp.gif" border="0" alt="[pimp]" />
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Old 01-15-2003, 01:38 PM
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do you get the same numbers kellogg, i had to use the "tunnelram dual carb" in desktop dyno to aproximate the flow of the stack manifold.. what does your computer say?
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Old 01-15-2003, 01:53 PM
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With Sequential-Fire Injection on Desktop Dyno using the same 246,623 cam with 11.5:1 comp. You get 585 hp @ 5500 rpm and 619 torque @ 4000 rpm
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Old 01-15-2003, 02:03 PM
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Tracy's #'s are close so you may checkout more cams.comp's extreme energy cams are awesome . i currently run one and have afr heads on my sbc.. gotta go c-ya next time..
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