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Author
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Topic: Torque
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Fastymz
Moderator Posts: 20638
From: Reno Nv USA M&M#1240
Registered: Apr 2001
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posted 01-30-2004 07:24 PM
   
I've read that if you build a motor for torque. The torque will drop off more slowly and there for the HP can still keep climing at the higher RPM. So then how do you build a for Torque ?
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SCOOP oddly obsessed with big scoops on little Mustangs 2.26 60'S
14.9 @ 90.86MPH 65 coupe,351w,C4,Big Boss 429 hood scoop,8" 3.40 TracLoc. My Pics
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V8 Thumper
Gearhead Posts: 4638
From: Phoenix, Arizona
Registered: Dec 2001
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posted 01-30-2004 09:33 PM
Looooooong stroke, smaller intake valves, smaller intake runner and port volume, smaller carb, wider lsa camshaft (advanced) with less lift and duration, and many others I'm sure will be added to the list. The stroke is sheer mechanical energy induced by heat expansion (combustion), the intake tract promotes velocity rather than volume. It makes for an earlier powerband but 'runs out of lungs' for breathin' up top so I can't agree with the theory that a motor built for 'torque' can continue to make power outside a wide-but-limited rpm range. Example: Swapping cams in my motor softend the low-end grunt some, but more than made up for it on the top end  Lower rpm operation is less prone to parasitic power loss vs. high rpm violence. Just my ramblings, I have no hard facts to back this up. It's just my motorhead brain thinking out loud   ------------------
1965 GT coupe, 333ci aluminum headed/solid cammed stroker, four speed, 3.70:1 9" All Blue Oval, no blue bottle
http://mustangsandmore.50megs.com/V8Thumper.html
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steve'66
Gearhead Posts: 9476
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 01-30-2004 10:27 PM
Torque is horsepower, the more torque you can make at higher speeds is horsepower. Over simplified torque is the ability to move something, horsepower is the ability to move it quickly. I know it's very simplified, but get the torque up in rpms and you'll make lots more power. 
You just have to gear and match the converter to make use of the faster torque.SteveW
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CHIPSBAD67
Gearhead Posts: 396
From: LOU,KY;USA
Registered: Sep 2003
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posted 01-30-2004 11:49 PM
good thread. since im giving up on the 351w for pops truck (long story) im back to making a torquy 306. hmmm, not a torque motor i know. going to use a mild cam, perfomer intake with a 4 hole spacer and 600 vac. sec. holley. long tube headers and excellent aluminum heads that flow well at low lift and make higher average numbers across the boad vs. the peak flow huge port heads. going to run close to 10:1 comp. a roller cam maybe, dont know yet. want parts that pay for themselves in performance, not that $500 trick that get you an extra 5hp. and 3 ftlbs. will be using deeper gears, and maybe a mild stall coverter. wish i had fuel injection on it. those 5.0's are the torquey-est 302's ive rode in. ------------------
306, 4speed, 4.11's....best 1/8 mile 7.58 at 92mph with 1.72 60ft. PUMP GAS/NO ADDERS/STREET TIRES
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falcon64
Gearhead Posts: 410
From: Pa.
Registered: May 2003
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posted 01-31-2004 08:26 AM
quote:
Originally posted by CHIPSBAD67:
good thread. since im giving up on the 351w for pops truck (long story) im back to making a torquy 306. hmmm, not a torque motor i know. going to use a mild cam, perfomer intake with a 4 hole spacer and 600 vac. sec. holley. long tube headers and excellent aluminum heads that flow well at low lift and make higher average numbers across the boad vs. the peak flow huge port heads. going to run close to 10:1 comp. a roller cam maybe, dont know yet. want parts that pay for themselves in performance, not that $500 trick that get you an extra 5hp. and 3 ftlbs. will be using deeper gears, and maybe a mild stall coverter. wish i had fuel injection on it. those 5.0's are the torquey-est 302's ive rode in.
That,s very similar to the idea I have in mind for the 5.0 H.O. doner for my Sprint, except I'm going with the stock pistons, crank and heads with mild porting, a cam with emphasis on low and mid range torque, Weind Stealth or Performer intake with a small carb around 600 cfm. unfortunatly unless I pay through the nose for headers (Doug's) it's hard to find a set of TriYs that will fit, especially if you're running a manual trans. so although a little pricey I'll probably go with the modified Hi Po manifolds. I'm running 3.23 gears and plan to keep them. This should work well in such a light car. In my estimation on the street a torquey engine is the way to go.
[This message has been edited by falcon64 (edited 01-31-2004).]
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Fastymz
Moderator Posts: 20638
From: Reno Nv USA M&M#1240
Registered: Apr 2001
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posted 01-31-2004 01:16 PM
BTW I was not just asking for my own motor just any motor ?
Whats low RPM and high RPM any ways, is the cut off around 6000rpm ?------------------
SCOOP oddly obsessed with big scoops on little Mustangs 2.26 60'S
14.9 @ 90.86MPH 65 coupe,351w,C4,Big Boss 429 hood scoop,8" 3.40 TracLoc. My Pics
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Dubz
Gearhead Posts: 1888
From: Manitoba Canada
Registered: Oct 2002
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posted 01-31-2004 01:49 PM
putting all my info with the cam from summit, home ported 351W head flow #, carb, headers, and the compression after milling and thinner head gaskets (8.7:1) into a desktop dyno type program gave me over 350ft-lbs from 2000-5000rpm with a peak of around 375 @ 3500so you shouldn't have had any problems with torque either Ron. maybe it's the rear gear you are running, 3.40 isn't a really torquy gear ------------------
1974 Gran Torino (351W/c6)
My Page
Mustang&Fords suggested a Torino restomod, but i have yet to see one...so i'm building one [This message has been edited by Dubz (edited 01-31-2004).]
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Fastymz
Moderator Posts: 20638
From: Reno Nv USA M&M#1240
Registered: Apr 2001
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posted 01-31-2004 02:03 PM
Dubz your right about the gears. But at $70 for a traclock with 3.40 gears was hard to say no to.
I never took the car back to the track with the long tubes and the new cam, and the carb and timing all dailed in.
I only had it at a poorly set up 1/8th mile track with no timers. I can tell I was able to take most 5.0's by 1-2 car lenghts. That was leaving at idle, or the tires would just go up in smoke. My motor was using some oil and smoking out the pipes alittle, so I was looking to rebuild it anyways. After the motor is done next year I hope to get some 3.80 gears and a 3000-3500 stall in it. ------------------
SCOOP oddly obsessed with big scoops on little Mustangs 2.26 60'S
14.9 @ 90.86MPH 65 coupe,351w,C4,Big Boss 429 hood scoop,8" 3.40 TracLoc. My Pics
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