10-30-2017, 11:59 AM | #15 | |
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I imagine a Camaro GT4 with a 5 liter... and maybe a VIN |
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10-30-2017, 03:28 PM | #16 |
Romans10:9-13
Drives: /\yes, this is me/\ Join Date: Nov 2008
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It was orange, that could've been it
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10-30-2017, 04:08 PM | #17 |
Drives: 2001 Onyx Black/Ebony SS. 427/M6 Join Date: Apr 2016
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Not judging, but how is NHRA HP different than SAE HP? Do you have a way of knowing how the NHRA certifies its HP ratings? I saw something on their page about Automatic Horsepower Factoring System, but it seemed a bit complex to me. Obviously the 427 makes 505 HP in street form, but only 470 in NHRA certification, so it is different in some way.
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10-30-2017, 06:00 PM | #18 |
Drives: Slow Join Date: Apr 2010
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You guys do realize this motor is in a car that isn't street legal, right? It wouldn't make nearly as much power if it was re-engineered for street use to meet fuel economy and emissions regulations. Not to mention it's designed for a drag car, not a track car.
You need the big displacement for big horsepower with a push-rod motor for a street legal car. The days of small displacement, high performance, street legal overhead valve motors are gone. GM and FCA are the only manufacturers left that still make high performance OHV motors, and they're all 6 liters plus for a reason. |
11-01-2017, 02:51 PM | #19 | |
Drives: 2004 Pontiac Grand Prix Join Date: Oct 2010
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Quote:
found the link: http://www.superchevy.com/how-to/eng...ro-ls7-engine/ So this 302 which has a 410HP rating is actually going to have a power rating much higher then that. As the LS7s are being pushed to over 8,000rpms this 302 with a 3 inch stroke is going to be pushed to well over that rpm limit meaning its going to make a massive amount of power. Remember torque times rpm divided by 5252 = horsepower, so with only 5.0L of displacement you make your power by revving higher. They are probably going to push it to 10,000rpms if not higher, if you assume 95ft-lbs/L then you would be looking at 475ft-lbs of torque. For a drag racing setup it is likely to be tuned for high rpm, if you assume 430ft-lbs at 9,000rpms then that is 736BHP. I don't know if Ford runs a normally aspirated 5.0L motor in their Cobra Jet motor however if they do then in theory the LT based 302 has a major rpm advantage over it. |
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11-09-2017, 08:30 AM | #20 |
Drives: 2012 SS/RS Vert & 2017COPO#23 SC350 Join Date: Apr 2012
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The 580hp for the S/C 350 and 470 for the 427ci are NHRA rated horsepower, not the power that the engine actually produces.
NHRA stock eliminator and super stock racing is based on a class system that is based on the horsepower to weight ratio of the car, so if you're racing in stock eliminator there are many classes such as A, B, C and so on. Back in the old days you could have a car such as a '66 Nova which could come with a range of motor sizes and even different power rated engines of the same displacement such as a 327 rated from the factory at 275hp or 350hp. These cars would be in different classes even though they have the same size motor. Stock and superstock are a handicap based racing system, where one car gets a head start based on it's estimated dial time and they're set up such that if each car runs exactly their dial time they would finish at the same time. The only time it is a heads up race is if two cars that are in the same class happen to come up against each other because they have similar horsepower to weight ratios. This being said a '66 Nova such as the one my dad used to race with a 327ci motor rated for 350hp made much more that 350hp. 350 was just the horsepower the engine was rated with from the factory, once you modified it (withing the strict rules governing stock and superstock) it could make over 600hp or 700hp if actually placed on the dyno, and run deep into the 10s. Now for theses new copos, cobrajets and drag pacs since they are not street produced motors the manufacturers and the NHRA had to come up with a number to apply for the sake of having a class to put these cars in. Somehow chevy and the NHRA came up with rating the S/C 350 at 580hp, and the 427 at 470hp, when realistically as delivered the 350 makes around 1100hp and the 427 makes approximately 900hp. And once you start making modifications to them like changing the pulley on the supercharger from the 3.5" pulley it comes with to the 3.25" pulley allowed by the nhra, blueprinting the motor, and adjusting the tune you can make around 1200hp. The blueprints for every stock or superstock engine combination allowed can be found here:http://www.nhraracer.com/content/gen...634&zoneid=132 Short answer: no they don't make 580hp and 470hp, these are just arbitrary numbers so the car can be placed in a class. Even as delivered they still make around 1100hp and 900hp. What exactly the 302 will be making remains to be seen
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CAI Cold Air Intake, Kaltech Tuned 2017 COPO #23 Black w/ Supercharged LSX350 2014 Raptor 6.2L Tuxedo Black Metallic w/ 2.9L Whipple, 78Lb/hr fuel injectors, Ford Racing Dual 65mm cobrajet throttle body, kooks headers & exhaust. 1969 Camaro SS (original SS350), Black w/ white Rally Stripes, new ZZ502ci 502hp motor, muncie 4 speed, 4.11 rear |
11-09-2017, 08:51 AM | #21 |
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What the COPO engines make is irrelevant to a street car. The 302 is street legal form would not cut it for the Z/28.
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11-09-2017, 12:03 PM | #22 |
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11-09-2017, 01:45 PM | #23 | |
Drives: 2015 SS 1LE Red Hot, 1970 Chevelle Join Date: Apr 2012
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Quote:
Look at the effort Ford made to get the power they needed out of a 5.2 liter engine. A 5.0 LTx won’t make nearly as much power. There’s no reason to stick to 5.0 liters, when the block can support at least 7.0 liters. Ford was capped at 5.2 liters by their block. GM isn’t.
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