HP vs TQ question - Page 2

Dwight · #21 (**permalink**) 07-16-2007, 10:48 PM

OK Sal
I need the peak torque at 5800 rpm. How do I get it there? Cam? Which one?
Dwight

Power Surge · #22 (**permalink**) 07-16-2007, 10:58 PM

Quote:

Originally Posted by Dwight

OK Sal
I need the peak torque at 5800 rpm. How do I get it there? Cam? Which one?
Dwight

Bigger cubes, or a power adder

.

RICK LAKE · #23 (**permalink**) 07-17-2007, 05:19 AM

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 · #24 (**permalink**) 07-17-2007, 07:24 AM

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 · #25 (**permalink**) 07-17-2007, 08:21 AM

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 · #26 (**permalink**) 07-18-2007, 02:52 PM

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

Anthony · #27 (**permalink**) 07-18-2007, 04:10 PM

Quote:

Originally Posted by dynoroom

More torque.... LOL...
Sorry.
400 lb/ft would be about 450 hp & 450 lb/ft would be close to 515.
The real question is how do you get that torque from the 350 you have now?
There's no magic wand.

Quote:

Originally Posted by Dwight

OK Sal
I need the peak torque at 5800 rpm. How do I get it there? Cam? Which one?
Dwight

The way I see it, any naturally aspirated engine can only take in so much air/fuel per revolution, which directly impacts on the torque generated. If your engine is generating 1.4 ft-lbs / ci (measured at flywheel), I would say that the engine is operating pretty efficiently. Therefore, max torque is limited by engine displacement. The only way to increase it significantly beyond this is with a power adder.

Horsepower is work/time, or the amount of energy delivered over time. As your car accelerates, it accumulates kinetic energy, 1/2mv*2 , derived from the horsepower delivered.

You can make any engine deliver max torque @ 5800 rpm's with the right cam, but if your intake, heads, exhaust are not up to snuff, then even though your max torque may be at 5800 rpm's, it may be a low overall value.

Your question should be - How do I make my engine make a lot of torque, with peak torque at 5800 rpms?

My suggestion would be to go to a local race track, find out the engine builders who build the winning engines, and take your car to them for suggestions.