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Turbostude53
08-08-2011, 07:02 PM
We are about ready to race!
http://www.youtube.com/watch?v=yBVnNNJgWtU

DEEPNHOCK
08-08-2011, 07:12 PM
Sounds stout!:p
Best of luck! Drive safe out and back...
Jeff:cool:


We are about ready to race!
http://www.youtube.com/watch?v=yBVnNNJgWtU

JRoberts
08-08-2011, 07:20 PM
Sounds really good. Good luck to you guys out on the Salt. You know we're rootin' for ya'.

mbstude
08-08-2011, 07:29 PM
Greg, make sure someone writes down each day's events. And take lots of photos.

BobPalma
08-08-2011, 08:48 PM
Greg, what axle ratio does that have? I'm sure it's tall for the salt, but is certainly noticeable when getting underway. Sounds like about 2.50:1 or something! <GGG> BP

Turbostude53
08-08-2011, 09:02 PM
Greg, what axle ratio does that have? I'm sure it's tall for the salt, but is certainly noticeable when getting underway. Sounds like about 2.50:1 or something! <GGG> BP

Actually Bob, the axle ratio is 3.89:1 which may seem unusual for a conventional Stude v8, but remember that this engine is destroked to 182" and is set up to make power between 6000 and 7700 rpm. Torque doesn't even show up till over 3000 rpm. Last year, we went 135mph on the GPS with a 4.11:1 rear end..... If you look closely, you will see the pushbar we added this year, assuming that we would need to be pushed up to 30mph due to the gearing.
Our 190" turbocharged flathead 6 stude motor actually made more torque, at lower rpms (but less HP) and at times we ran a 2.75:1.

BobPalma
08-08-2011, 09:06 PM
Actually Bob, the axle ratio is 3.89:1 which may seem unusual for a conventional Stude v8, but remember that this engine is destroked to 182" and is set up to make power between 6000 and 7700 rpm. Torque doesn't even show up till over 3000 rpm. Last year, we went 135mph on the GPS with a 4.11:1 rear end..... If you look closely, you will see the pushbar we added this year, assuming that we would need to be pushed up to 30mph due to the gearing.
Our 190" turbocharged flathead 6 stude motor actually made more torque, at lower rpms (but less HP) and at times we ran a 2.75:1.

'Good explanation, Greg; thanks. That does explain the ultra-low rpm getaway; such low torque just off idle with that short a stroke. What is the stroke, BTW? BP

Chris Pile
08-08-2011, 10:33 PM
Go fast, be safe, and have fun!

kurtruk
08-08-2011, 10:43 PM
Nice to have understanding neighbors. :)

Turbostude53
08-08-2011, 11:28 PM
'Good explanation, Greg; thanks. That does explain the ultra-low rpm getaway; such low torque just off idle with that short a stroke. What is the stroke, BTW? BP

The crank was destroked to 2.5". Assuming typical allowable piston speeds and a forged crank, that translates into a very high redline, limited by valve float. We have done dyno pulls to 7600+ rpm......

brngarage
08-08-2011, 11:41 PM
Sounds absolutely ferocious!! See you on the salt this Saturday.

BobPalma
08-09-2011, 05:57 AM
The crank was destroked to 2.5". Assuming typical allowable piston speeds and a forged crank, that translates into a very high redline, limited by valve float. We have done dyno pulls to 7600+ rpm......

Wow! 2.5" 'Can't help but wonder about the top piston speed attained in the course of running 7600 rpm. 'Might be even less than, say, a stock 289 at 5,000 rpm. BP

63larkr1
08-09-2011, 08:19 AM
Wow! 2.5" 'Can't help but wonder about the top piston speed attained in the course of running 7600 rpm. 'Might be even less than, say, a stock 289 at 5,000 rpm. BP


Piston speed of 54.17 FPS@7800 is the same as 5380 RPMs in a stock stroke engine.

Turbostude53
08-09-2011, 08:30 AM
Piston speed of 54.17 FPS@7800 is the same as 5380 RPMs in a stock stroke engine.

Or, using this calculator, and assuming a "heavy duty engine" capable of 4000 feet per minute piston speeds, 9600 rpm is the redline if everything in the valve train were to hold together......I asked Centerforce to provide a clutch which they thought might handle this. We don't plan on testing the theoretical calcs......

http://thefirstgensite.com/code/maxrpm.htm

Nelsen Motorsports
08-09-2011, 07:52 PM
What cam are you running?

Turbostude53
08-09-2011, 11:28 PM
What cam are you running?

The cam is a Comp Cam flat tappet regrind # 99-999-3 Stud 6056/6056 S112.0 Valve timing @.050 intake open @ 9 BTDC close @ 53 ABDC, exhaust open @ 53 BBDC close @ 9ATDC. Lobe separation 112.0. Gross valve .511 & .511.

The 6056 lobe profile is one of CompCams Xtreme Energy series. At 280 advertised and 242 @ .050", it sounds really gnarly in the little 182".