HP vs TQ question

[Bob In Ct]

So I guess both tractors and bulldozers will be good at getting up to speed on entrance ramps. The Formula 1 guys are making a mistake winding their engines up to 19,000 RPM.

I can produce 300 FT-LBS of torque on my bicycle, why is it I can only get up to 25 MPH?

Bob

[Jac Mac]

Originally Posted by Bob In Ct

So I guess both tractors and bulldozers will be good at getting up to speed on entrance ramps. The Formula 1 guys are making a mistake winding their engines up to 19,000 RPM.

I can produce 300 FT-LBS of torque on my bicycle, why is it I can only get up to 25 MPH?

Bob

Do you really want my thoughts on this????

Jac Mac

[CSX 4027]

I just had this discussion with Tom Kirkham. At both VIR and Watkins Glen, the fastest 427 Cobra I have seen runs in the 2.08 - 2.09. We all know what the car weighs. The Gt 350's also run around the same. When I had 4027, my best time was in the high 2.12's at The Glen. My former Winston Cup car has run The Glen and VIR at 1.58 - 1.59. That's a whole lot faster and a whole lot heavier. It was 780hp/500tq.
I think most buidt Cobra's as street monsters with way too much torque. The last 427 we built as a standard bore/standard stroke dynoed at 551hp and 565 tq. The motor is a killer on the street but I would have preferred to kill the torque a bit, like to under 500 and bring up the hp. That would have taken a bigger cam making it less streetable. You can't have everything.
The cup motors are set up great. It would be neat to see what a well set up Cobra would do with real Cup Power and not a version of.
But.........going that fast in a car as unsafe as a Cobra as opposed to a cup car is a bit nuts also.
Cheaper,safer,faster to have a Cup Car

[Dwight]

OK It took a while but I found this link to a site that was posted on the FFR Form. With our Cobras there are other factor to consider, like aerodynamic, HP, torque and lots of other things that make us go fast. I think Mr. L.E. Mayfield has very interesting information for us.


Here is the link to the site, http://www.mayfco.com/cobra.htm
Dwight


Automotive Analyses
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FFCobra Forum Question: How fast is my Cobra with this much horsepower?
This also works for all vehicles, shhhh!



INTRO


Once upon a time, in a land far away, I was a huge fan of the original Cobra and it's final originator, Shelby. I went to the plant is Southern California, but at the time was a starving student or just out of school at Cal Poly, SLO. I could not swing the 6 grand or so, so I quietly walked away. Then I bought a used Tiger. Jeeze, I am off track and have just started this. Well, anyway, I spent an entire career with the Boeing Company doing odd jobs. Some of them involved aerodynamics and such.


Now I know how you all feel about your cars, Cobras, whether or not original or a reproduction. I know that many of you are true performance fans and have hopped up your cars to the n th degree. But, after all that hopping up, you find that there is little in the way of knowing just how fast it is or can be. Roads with the public on them just aren't the way to go and the drag strip just isn't quite enough either. What I have done for my Tiger, I am gonna try and do for you. I am going to develop a set of tools that you can use to figure it all out: "Just how fast will my Cobra go?"


Now you will have to go to his site to finish reading the article. With the charts it was to large to post here. Dwight

[RICK LAKE]

CSX4027 Steve how can you compare the two?? A fly brick, or barn door to a Nascar cup car that has been in a wind tunnel?? Come on. What's the CD on a cobra with what windshield? stock or the comp one. What's it on your Nascar cup car. Down force, cobra not much with comp windshield, car starts lifting at 125mph, Nascar front chin spoiler, rear deck spoiler, every piece of the body rounded and smoothed. And the best for last, was a complete roll cage in the cobra like the nascar car?? You put Boris Said in both car and let him race road course, then let's see where we are. Sorry Steve You left out alot of varibles. I would put Morris C's car or Steve's car from Run and Gun against the nascar car and take the less HP. You didn't say what tires where on these cars. I am stopping. You have been with cars for how many years, and you compare a throughbred to a quarter horse in a 1 mile race. Rick Lake Ps when are we going to the Manor for the buffet

[CSX 4027]

Tom & I were just having a casual discussion about it.
All differences noted, the Cobra just looks like it should be faster. Not even the Shelby Challenge Cars would beat a Cup Car. That too looked like it should too.
I just like the idea of the cup motor with less torque, more horsepower and more rpm's for the Cobra. I bet most would feel it more driveable and predictable on the track

[Dwight]

A couple of years ago there were 2 guys on CC that had 358 Nascar motors in their Cobras. One posted a video of 2 laps at one of the 2 or 2 1/2 mile tracks. He was turning 8000 rpm at times. I could not find the link to the video, I guess I lost it.

This is an Ebay ad for a Nascar motor that sold about 3 years ago for about $5200.
Dwight
** ** *** ** *** *** ** *** ** *** *** ** **
THIS IS A COMPLETE FORD SMALL BLOCK 358 NASCAR MOTOR. THIS COMPLETE ENGINE WAS TAKEN APART FOR INSPECTION AND IS A COMPLETE MATCHING ENGINE WITH NO DAMAGE AND JUST NEEDS A FRESHEN UP AND ASSEMBLY. IT WAS A 9/1 COMPRESSION MOTOR AND I HAVE SOME HIGH COMPRESSION PISTONS IF THE BUYER WANTED TO RAISE THE COMPRESSION. THE HEADS ARE FULLY PORTED YATES C-3
CASTINGS PORTED BY DIAMOND RACE HEADS WITH 2.100 AND 1.600 DELWEST STEEL TIPPED TITANIUM VALVES, DEL WEST TITANIUM RETAINERS AND COMP CAMS ROLLER SPRINGS. THE COMPLETE JESEL ROCKER SYSTEM IS 1.6 INTAKES AND 1.55 EXHAUST.
THE BLOCK IS AN OLD STYLE A-351 SIAMESE BLOCK WITH 2.75 MAINS AND A BORE OF 4.125 AND ROLLER CAM BEARINGS. THE MATCHING ROLLER CAM AND COMP CAMS SOLID ROLLER LIFTERS AND CV PRODUCTS HOLLOW PUSHRODS. THE ULTRA LITE SONNY BRYANT BILLET 3.320 CRANK HAS 2.75 MAINS AND 2.00 X .940 ROD JOURNALS AND IS GUN-DRILLED WITH PROFILED COUNTERWEIGHTS. THE MATCHING 6.300 CARRILLO RODS ARE THE LIGHTEST VERSIONS AVAILABLE AND HAVE CARR BOLTS.
THE J & E 9/1 PISTONS ARE LIKE NEW AND HAVE THE 2.500 LITE PINS. THE OILING SYSTEM IS A HAMBURGER OVAL TRACK/ ROAD RACE NASCAR PAN AND THE 4-STAGE PUMP HAS ALL THE LINES AND MATCHING BRACKETS. THE MSD 8384 BILLET DISTRIBUTOR HAS DUAL PICK-UPS. THE ATI FLUID DAMPER IS PART NUMBER 4069938 AND IS SFI APPROVED. THE FULLY PORTED EDELBROCK INTAKE IS A 2991. THE MOTORSPORT ALUMINUM VALVE COVERS HAVE A BREATHER ON 1 SIDE. THE 1-WIRE ALTERNATOR AND CARTER FUEL PUMP ARE INCLUDED. ALL BRACKETS AND BOLTS ARE THERE ALSO. THE FRONT COVER IS A $500 ERNIE ELLIOT MAGNESIUM PART WITH SOLID DRY SUMP PUMP MOUNT.

[jdean]

This sort of sums up my thoughts on it.......(read the caption!)