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explain foot pounds to me

tecton

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it makes no sense to me at all

what is a foot pound
 

velocitiii

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ft-lb is a measure of torque or twisting motion.
1 ft-lb is the amount of twist you would have if you had a 12 inch wrench on a bolt and you put a 1 lb weight on the very end of the wrench.
 

dremu

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the amount of torque applied by that many pounds on a lever one foot long, or one pound on a lever that many feet long, or any combination thereof.

So for 100 ft-lbs, you could put 10# on a 10 foot lever, or 100# on a 1' lever, or 1# on a 100' lever, which in theory should all apply the same torque.

This is why if you can't yank off a lug nut, say, you get a cheater pipe, which gets you a longer lever for you to jump and down on.

The scientific types will jump in and give you more details, but I think that's the basic idea.

And is it foot pounds or pound feet? I always get it wrong.

-- A
 

sandawgk5

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I have always had it explained as the amount of energy to move 1 pound 1 foot straight up i.e. lbs-ft. That is how you can calculate horsepower based solely on a torque number.
 

tecton

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that explains alot

so lets say my truck makes 300lb ft or tourque...my truck puts 300lbs of force on the end of the hypothetical 12inch wrench?

that cant be right
 

dremu

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Well, the engine might do 300 lb/ft at the flywheel -- if it's a big one, or a diesel -- but then the gear reductions of the tranny, transfercase and diffs increase that.

So my stock 350 which puts out something like 250 lb/ft goes through the TH350 low gear which is what, ~3:1 and then the NP203 in low gear is 2:1 and my diffs are 3.73:1... so net is somehting like 5600lb/ft applied to the wheels. If I were flooring the poor girl in low/low in an ideal world of no loss, slippage, etc etc.

This is why you can snap axle shafts /forums/images/graemlins/laugh.gif

-- A
 

Paxx

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[ QUOTE ]
This is why you can snap axle shafts /forums/images/graemlins/laugh.gif



[/ QUOTE ]

This just cracked me up when I read it /forums/images/graemlins/rotfl.gif

I think it was the smiley that did it lol /forums/images/graemlins/histerical.gif
 

mike reeh

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I think everyone pretty much covered it. An interesting tidbit- if you ever look at a torque/hp curve chart, they should always be equal (torque and horsepower) at 5252 rpm.

mike
 

duece21

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New cat they are puttin in freightliners and kenworths

How bout them foot pounds. For a truck engine at least, twin turbo. So now when they break people can pay $3,200 for new turbo's instead of 1,000.

C15TurboSideAngle.jpg


Cylinders In-Line 6
Bore/Stroke 5.4 x 6.75 (137mm x 171mm)
Displacement 15.2 L (928 cu in)
Weight 2890 lb (1311 kg)
Horsepower 435 to 550 @ 2100 rpm
Torque 1350-1850 lb0ft @ 1200 rpm

All for more power & Higher emissions standards /forums/images/graemlins/rolleyes.gif
 

84gmcjimmy

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15.2 L /forums/images/graemlins/yikes.gif /forums/images/graemlins/eek.gif /forums/images/graemlins/yikes.gif /forums/images/graemlins/eek.gif
 

Highjaxx

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I drive a truck with 500HP and about 1500ft/lbs /forums/images/graemlins/laugh.gif

Coming out of a Detroit 60 Series turbo, with a 3 level engine brake.

Really makes me want to buy turbo diesel pick-up.
 
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