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Author
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Topic: how to figure hp on paper
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68 fastback man
Journeyman Posts: 18
From: church hill tn hawkins
Registered: Nov 2004
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posted 01-23-2005 01:32 PM
   
i am starting a new project and want to know if ther is any baseline # for figuring how much hp i will be biulding?------------------
68 fairlane500 fastback 302 hi performance
83 f150 5.0 street rod
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Toronado3800
Gearhead Posts: 903
From: St. Louis, MO
Registered: Jul 2001
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posted 01-24-2005 01:21 AM
I haven't seen the paper formulas but figure they're quite imposing. I have a comptuer program called Desktop Dyno 2000 which seems to come close. Even used to have another program that would simulate times and shift points for a 1/4 mile if you dug enough about drag coefficients wheel base, etc out of car magazines.Both programs, especially when used together, seemed to be a little optimistic, but maybe that was due to personal work inefficecies.
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Dusty Kiser
Gearhead Posts: 175
From: Bethel,Oh USA
Registered: Mar 2002
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posted 01-24-2005 09:04 PM
There are several software programs that calculate potential horsepower, but whether slide rule or IBM you need specific information on every componant, accurate cylinder head flow numbers, valve events, induction CR etc. Sounds to me like you may be as well off deciding what power level you wish to attain and look at crate motor specs for that power level, or ask Alex or other expert their ideas on how to achieve those goals.
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68 fastback man
Journeyman Posts: 18
From: church hill tn hawkins
Registered: Nov 2004
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posted 01-24-2005 10:58 PM
thanks for the info. im looking for something in the370-400 hp range being that i am going to street the car it has to be drivable and sound intimidating as well. it is 68 fairlane fastback.what im looking at using is a set of 59cc heads 1.94 int 1.6 ext valve with 9.5 -1 comp a std bore and stroke 302 with a single 600 cfm 4 barrel. the cam im looking at has a 280 dur and 472 int 496 ext lift 112 center line and changing to 1.7 roller tip rockers. head porting, 1 1/2 inch headers and 3 inch exahst. i plan on smoothing the rods and crank. if anyone has any thoughts i would be glad to hear from you.------------------
68 fairlane500 fastback 302 hi performance
83 f150 5.0 street rod
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bluestreek
Gearhead Posts: 1724
From: Athens,GA
Registered: Jul 2001
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posted 01-24-2005 11:31 PM
If you plan on 370-400HP with stock heads, You better plan on a bigger cam than that. For a real good sound and approx 350 fwHP with ported stock heads and free flowing exhaust, a CompCams 282S should do the trick. Above that, you'll start to loose some streetabilty.------------------
1966 Mustang Coupe: Custom glass hood and BIG scoop sits atop a 289 stroked to 331 c.i., Steel crank, rods and girdle, TFS alum. heads, Stealth 8020 intake, Xtreme 268 Solid Roller, Holley 750 HP, long tubes, 4speed, 9" 3.50 posi.
11.50 @ 116 mph (7.33 @ 93 mph)daily driver!
DanH
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Tom G
Gearhead Posts: 616
From: Bethlehem, Pa USA
Registered: Nov 2001
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posted 01-26-2005 04:30 PM
A suggestion, 331 or 347 short block or get a long block with some decent heads on it 400+ fwhp should be fairly easy. You may have to step up on the carb though. JustMy 2 Cents Not to push FRPP crate engines though a FRPP 347 is at 400 hp The GT40x head 302 is 340 with FI and 355 with a carb. My GT 40 made 268 rwhp with 600 holley (no tuning) thru the mufflers. Also ran 13.39 out of the box on tiny street tires. ------------------
67 Mustang F/B 302 GT-40X FMS engine RPM Air Gap 650 BG CLAW Edelbrock 100 shot Crane 1.7 rollers ceramic coated headers T5, cable clutch Flows X Pipe 3.89 9". Clearwater Aqua GT Clone Vintage40 series 16X8 225 front 255/50 rear drag radials 13.25 @ 103mph 88 GT 5 spd new project 77k original miles Red and Silver
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74merc
Gearhead Posts: 1159
From: Demopolis AL
Registered: Jun 99
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posted 01-27-2005 12:29 AM
google engine analyzer 3.0, nice application and free. Version 3.3 is pay per play... gotta buy it.
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