MK-I MK-II MK-III MK-IV GULF MIRAGE J-CAR LOLA
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Why not start with your first post today and become an active part of GT40s.com now! And, if you find you enjoy GT40s.com think about becoming a Forum Supporter. | | GT40 Tech - Engines/Induction/Exhaust Motors and engine related - right here! | 
04-24-07, 10:35 AM
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#1 (permalink)
| | Neal 8 Tenths 
Join Date: Sep 2001 Location: Seattle, WA, US GT40: GT40 NZ
Posts: 851
Rep Power: 15  | Guess my HP / TQ
I'm putting together a bullet for another project and thought it might be fun to get some preliminary HP/TQ estimates. I'll give you some specs without identifying specific parts. You might need to do a bit of math...
You guess the peak HP at what RPM and peak TQ at what RPM. Closest results will get a little something in the mail to savor the victory 
Here are the specs:
Shortblock:
351 Windsor 9.5 deck w/ 4.0 stroke and 6.2 rod and 0.030 overbore
-19cc dish pistons
0.043 head gasket thickness 4.010 bore
Zero deck piston height
Heads:
60cc Combustion Chamber 2.05 intake, 1.6 exhaust
205 cc Intake Ports / 75cc Exhaust
Flow Specs (cfm) .200" 127/108
.400" 234/167
.600" 291/195
.700" 285/199 Valve Train: Hydraulic Roller - .608 In/Ex Lift 248/258 dur @. 050 114 lobe sep. No advance Roller Rockers w/ Rocker Support
Intake:
High rise square bore, port matched
Carby:
750cfm Billet body 4150 style
Headers:
1 3/4" primary w/ low restriction extensions
__________________ GT40 NZ - 347 / Webers / Red and White - My build site
FFR Roadster #4867 408 / TKO / 3-Link | 
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04-24-07, 01:02 PM
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#2 (permalink)
| | Gordon Levy Bronze Supporter
Join Date: Sep 2001 Location: Maricopa AZ
Posts: 327
Rep Power: 10 | Re: Guess my HP / TQ
530hp@6200
525lbft or torque@5250 | |
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04-24-07, 01:52 PM
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#3 (permalink)
| | iank2112 8 Tenths
Join Date: Sep 2001 Location: San Diego, CA GT40: none yet
Posts: 896
Rep Power: 15 | Re: Guess my HP / TQ
Are we talking flywheel or rear wheel HP?
I'm guessing 600HP@5850RPM, 580 lbs/ft@5250RPM - rear wheel numbers.
Ian
__________________
A few fries short of a Happy Meal | |
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04-24-07, 03:30 PM
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#4 (permalink)
| | Scott McDill Silver Supporter
Join Date: May 2003 Location: Florida USA GT40: RCR 17
Posts: 61
Rep Power: 6 | Re: Guess my HP / TQ
Hp 525@6300
Tq 440@5500
__________________
RCR GT#17/331/TWM-efi/ZF | |
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04-24-07, 04:59 PM
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#5 (permalink)
| | jonathans Silver Supporter
Join Date: Jun 2005 Location: TN, USA GT40: RCR
Posts: 342
Rep Power: 7 | Re: Guess my HP / TQ
I wouldn't argue with Gordon. He is usually on the money on this issue. | |
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04-24-07, 05:21 PM
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#6 (permalink)
| | Ron Earp Site Administrator
Join Date: Sep 2001
Posts: 3,897
Rep Power: 54  | Re: Guess my HP / TQ
Flywheel or rear wheel? | |
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04-24-07, 05:46 PM
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#7 (permalink)
| | Gordon Levy Bronze Supporter
Join Date: Sep 2001 Location: Maricopa AZ
Posts: 327
Rep Power: 10 | Re: Guess my HP / TQ
Im guessing on flywheel | |
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04-24-07, 06:01 PM
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#8 (permalink)
| | Neal 8 Tenths
Join Date: Sep 2001 Location: Seattle, WA, US GT40: GT40 NZ
Posts: 851
Rep Power: 15 | Re: Guess my HP / TQ
Flywheel - Should be on the dyno in two weeks
__________________ GT40 NZ - 347 / Webers / Red and White - My build site
FFR Roadster #4867 408 / TKO / 3-Link | |
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04-24-07, 06:11 PM
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#9 (permalink)
| | Doc Watson 5 Tenths 
Join Date: Feb 2005 Location: Devon, UK GT40: Replica Mk I
Posts: 505
Rep Power: 10 | Re: Guess my HP / TQ
hp 550@6110
tq 515@5330
Any photos of the engine?
BTW been a big fan of your site for some time......
Andy
__________________
replica mono chassis
original rear clip
1966 289
48IDA's
This month its going to be red
'This car you have to be measured for...' | |
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04-24-07, 07:03 PM
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#10 (permalink)
| | Mark Worthington Bronze Supporter
Join Date: Dec 2001 GT40: Massachusetts
Posts: 1,787
Rep Power: 24 | Re: Guess my HP / TQ
493 hp @6,100 rpm
480 lb-ft @ 5,000 rpm
__________________
Regards,
Mark
RF Chassis No. 36 still under construction
347, MoTeC EFI, pin drives, leather, etc. | |
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04-24-07, 07:53 PM
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#11 (permalink)
| | Ron Earp Site Administrator
Join Date: Sep 2001
Posts: 3,897
Rep Power: 54 | Re: Guess my HP / TQ
Okay, I'll take a shot.
515 hp at 6400 RPM
465 tq at 5400 RPM
Didn't do any arithmetic to see if those numbers even make sense.
Ron | |
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04-24-07, 09:09 PM
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#12 (permalink)
| | Bob Rookie
Join Date: May 2006 Location: Roseville Ca. USA GT40: GT40NZ
Posts: 12
Rep Power: 3 | Re: Guess my HP / TQ
With the info posted I'm guessing
3 bent rods
5 bent valves
2 chewed up vic jr. heads
--OR--
Assuming that the gasket bore is really 4.100"
I'm guessing,
503 HP @ 6500
470 TQ @ 5000
Bob | |
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04-24-07, 09:29 PM
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#13 (permalink)
| | iank2112 8 Tenths
Join Date: Sep 2001 Location: San Diego, CA GT40: none yet
Posts: 896
Rep Power: 15 | Re: Guess my HP / TQ
Whoops, well, I'll keep my numbers as flywheel guess. I actually meant
flywheel and not rear wheel, but life happens ...
so 600HP@5850, and 580 lbs/ft@5250 - flywheel.
Ian
__________________
A few fries short of a Happy Meal | |
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04-24-07, 09:41 PM
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#14 (permalink)
| | Big-Foot Gold Supporter
Join Date: Jan 2007 Location: Minneapolis, MN GT40: Replica
Posts: 1,338
| Re: Guess my HP / TQ
Flywheel ratings
535 HP @ 6000
500 TQ @ 5250
Needs more Carb and more lobe separation to go higher. Should have a nice flat torque curve with the cam you have though.. | |
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04-25-07, 01:19 AM
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#15 (permalink)
| | Sandy Gulf GT40
Join Date: Jan 2003 Location: Los Angeles, CA GT40: RCR GT40 Gulf
Posts: 1,134
Rep Power: 18 | Re: Guess my HP / TQ
Is the correct answer is 'Not enough' ? 
I'll shoot at 585hp at 6300, 510 th at 5200
Random numbers just to be different.
Sandy
__________________ RCR GT40 #11 348" Alloy SBF, 930 Box, Gulf 1075 Trim Now in the Garage, still under construction... www.gtsparkplugs.com Links to the cars | |
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04-25-07, 03:44 PM
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#16 (permalink)
| | 40bud 6 Tenths
Join Date: Nov 2001 Location: San Francosco a GT40: GTD Finished in
Posts: 693
Rep Power: 13 | Re: Guess my HP / TQ
504 HP @ 6000 and 495 Torq. @ 4800 | |
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04-25-07, 06:21 PM
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#17 (permalink)
| | Pantera1889 10 tenths
Join Date: Jul 2003 Location: Maryland,USA GT40: RCR MK1
Posts: 1,070
Rep Power: 18 | Re: Guess my HP / TQ
HP:595 @ 6150
Tq:565@ 4650
__________________
RCR GT40 MK1 chassis #14
DeTomaso Pantera #1889 | |
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04-25-07, 07:12 PM
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#18 (permalink)
| | 10 tenths
Join Date: Jun 2002 GT40: San Francisco Bay Area California USA
Posts: 1,865
Rep Power: 25 | Re: Guess my HP / TQ
I just figured about 1.4 HP per inch on pump gas limmited by the 750 was about right at 550 or so. The hyd lifters will limit revs somewhat so you won't be able to spin it up too far. SO..... my guess is......
HP 540 @ 5900
TQ 490 @ 4600
Last edited by Howard Jones; 04-25-07 at 07:20 PM.
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05-04-07, 09:55 AM
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#19 (permalink)
| | MReid 4 Tenths
Join Date: Apr 2007 Location: Connecticut GT40: RCR Mk1
Posts: 457
Rep Power: 6 | Re: Guess my HP / TQ
Hopefully I made it before the dyno day:
HP: 540 @ 6200
TQ: 515 @ 5200
Assuming no rev limiter and correct valve springs.
__________________
Have fun with your build! - Mark
FFR Daytona Coupe
RCR Gt40 Mk1 in the garage, and underway! | |
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07-01-07, 07:38 PM
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#20 (permalink)
| | Neal 8 Tenths
Join Date: Sep 2001 Location: Seattle, WA, US GT40: GT40 NZ
Posts: 851
Rep Power: 15 | Re: Guess my HP / TQ
Say hello to my little friend. Dyno time next week. 408_bottom.jpg 408_top.jpg 408_Complete.jpg
__________________ GT40 NZ - 347 / Webers / Red and White - My build site
FFR Roadster #4867 408 / TKO / 3-Link | |
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