Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

Horsepower, and Torque..... whats the difference?

Discussion in 'The Garage' started by Silver84k5, Nov 25, 2003.

  1. Silver84k5

    Silver84k5 1/2 ton status

    Joined:
    Feb 7, 2002
    Posts:
    3,769
    Likes Received:
    0
    Location:
    Hillsboro Oregon
    I was reading the 4wheeler mag, and they were trying to explain it to me. I cant see a difference. Can somone give me a few examples of differences between the two..... Or try to explain it better?
    (this question may sound stupid but ive always wondered about it.)
     
  2. zcarczar

    zcarczar 1/2 ton status

    Joined:
    Feb 10, 2002
    Posts:
    2,495
    Likes Received:
    0
    Location:
    Apple Valley California
    Torque is the force that makes your vehicle move. Horsepower is a result of Torque and RPM.
     
  3. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

    Joined:
    Dec 14, 2001
    Posts:
    22,059
    Likes Received:
    69
    Location:
    Pleasanton, CA.
    It simply breaks down to this, Torque gets you going and HP keeps you going.
     
  4. Topdown

    Topdown 1/2 ton status

    Joined:
    Nov 26, 2002
    Posts:
    2,598
    Likes Received:
    0
    Location:
    Vancouver, Washington, U.S.A
    I agree with the other two statements and will add this:

    I always equate torque to pulling power and horsepower to passing power. Pulling power may only be the engine pulling the weight of your truck, but its still pulling none the less. I consider it acceleration from a dead stop.

    so, 400hp = fast car 400tq = quick car (or burned tires)

    Like I said, thats the way I have always seen them.
     
  5. clubba68

    clubba68 1/2 ton status

    Joined:
    Dec 6, 2002
    Posts:
    1,511
    Likes Received:
    0
    Location:
    Eugene-Portland, Oregon
    [ QUOTE ]
    I agree with the other two statements and will add this:

    I always equate torque to pulling power and horsepower to passing power. Pulling power may only be the engine pulling the weight of your truck, but its still pulling none the less. I consider it acceleration from a dead stop.

    so, 400hp = fast car 400tq = quick car (or burned tires)

    Like I said, thats the way I have always seen them.

    [/ QUOTE ]
    400hp & 400tq = badass car! /forums/images/graemlins/thumb.gif
    -Andrew /forums/images/graemlins/usaflag.gif
     
  6. 99firehawk

    99firehawk 1/2 ton status

    Joined:
    Dec 15, 2002
    Posts:
    491
    Likes Received:
    0
    Drive a modified rice burner that is called horse power

    Drive a stock camaro that is called torque
     
  7. Topdown

    Topdown 1/2 ton status

    Joined:
    Nov 26, 2002
    Posts:
    2,598
    Likes Received:
    0
    Location:
    Vancouver, Washington, U.S.A
    Andrew... you know that 410/425 small block sitting on the floor of my garage used to be in the /forums/images/graemlins/k5.gif right? /forums/images/graemlins/thumb.gif

    since no-one is willing to pony up the green to buy it I think I might keep it and put it in an early chevelle or nova, I would love an old wagon to put it in... gotta love the old wagons. All the room, all the luxury, all the power! /forums/images/graemlins/pimp1.gif

    -Ryan
     
  8. Silver84k5

    Silver84k5 1/2 ton status

    Joined:
    Feb 7, 2002
    Posts:
    3,769
    Likes Received:
    0
    Location:
    Hillsboro Oregon
    HOw much you asking for, for that motor in your garage? a buddy told me about a deal from "Cylinder Head Exchange" (i think thats the name of the place) Where they have a 383 with 415 hp, and 425 foot pounds of torque, for 2 grand, with a 12k warranty.... Me and him both kinda thought that the deal sounded a little too good to be true....
     
  9. Topdown

    Topdown 1/2 ton status

    Joined:
    Nov 26, 2002
    Posts:
    2,598
    Likes Received:
    0
    Location:
    Vancouver, Washington, U.S.A
    well, I have all the paperwork for almost all the parts and it totals out at 3000.00 with carb. (not including gaskets, bolts, balancer, distributor, flexplate, etc... or the cost of machining the block (bored .030 over), line-honing, magna-fluxing, etc... or assembly.)

    So, I am hoping to get 3500.00 for it as that will cover all the parts and machining... I will have to eat the cost of assembly, Dyno, Tuning, etc...

    I know its steep for a price, so I figure that no one will want to buy it (or no one can afford it) so I will keep it and use it somewhere...
     
  10. Triaged

    Triaged 1/2 ton status

    Joined:
    Feb 21, 2001
    Posts:
    3,808
    Likes Received:
    0
    Location:
    CA (LA/OC area)
    How about an equation (what else am I good for /forums/images/graemlins/confused.gif)

    HP = Torque/5252

    Have you ever noticed that ALL torque/hp curves cross just after 5000 rpm...this is why.

    With the right gearing a motor with 350hp at 7500 rpm and 200 lb*ft will be jsut as fast accelerating as motor that has 350 hp at 5000 rpm and 350 lb*ft of torque. It has to do with how many fireing cycles per min are taking place.
     
  11. Stroked72Blazer

    Stroked72Blazer 1/2 ton status

    Joined:
    Nov 9, 2002
    Posts:
    352
    Likes Received:
    0
    Location:
    Little Rock, AR
    He has it right HP is a calculation of torque. Hot rod Mag put it this way: Torque it how much work a motor can get done, HP is how long it takes to get said work done.
     
  12. Blazer1970

    Blazer1970 1/2 ton status

    Joined:
    Feb 17, 2000
    Posts:
    1,600
    Likes Received:
    0
    Location:
    Old Mission, MI
    Torque is a measure of how much force the engine can apply to spin the crankshaft.

    For any engine, this force is different depending on how many RPM the engine is turning.

    Horsepower is a measure of how much work an engine can do.

    If you have one engine that can produce 400 lb-ft of torque at 1000 rpm, and another engine that can produce 400 lb-ft of torque at 2000 rpm, you can do twice as much work with the second engine operating at 2000 rpm than you can with the first engine operating at 1000 rpm. The second engine will also be producing twice the horsepower at 2000 rpm than the first engine will be at 1000 rpm.

    In order to characterize how much work you can really do with a given engine, you need to look at the torque curve, a graph that shows you how much torque the engine can produce across its entire operating range of rpm. The peak hp and torque numbers that are normally tossed around, and used in advertising DO NOT TELL THE WHOLE STORY.

    Oh, and Triaged - you were close: HP = torque (lb-ft) X rpm / 5250
     
  13. boz42

    boz42 1/2 ton status GMOTM Winner

    Joined:
    Jun 3, 2003
    Posts:
    3,181
    Likes Received:
    0
    Location:
    Hopewell, Tn 38058
    u are really close on your fomula. actually it is

    HP = (torque x RPM) / 5252
     
  14. heavy4x4

    heavy4x4 1/2 ton status

    Joined:
    Aug 28, 2002
    Posts:
    3,270
    Likes Received:
    0
    Location:
    Delafield, Wisconsin
    Here's probably a more thorough (and easy to understand) explanation than you'll ever need.
     
  15. Greg72

    Greg72 "Might As Well..." Staff Member Super Moderator

    Joined:
    Mar 5, 2001
    Posts:
    15,680
    Likes Received:
    1,391
    Location:
    642 Days to BB2018
    [ QUOTE ]


    Oh, and Triaged - you were close: HP = torque (lb-ft) X rpm / 5250

    [/ QUOTE ]


    [buzzer]

    Ooooooh sorry....the formula IS hp=(rpm x torque)/5252

    [/buzzer]



    It's always a good idea to doublecheck your formulas before telling Triaged he's wrong......Dan has a BIG brain! /forums/images/graemlins/thumb.gif



    Personally, I like to think of torque as "real" and horsepower as "imaginary"..... /forums/images/graemlins/thinking.gif



    ....as soon as I see a service manual describing how much HP to apply to my bolts, I'll revise my thinking. /forums/images/graemlins/grin.gif
     
  16. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

    Joined:
    Jul 23, 2000
    Posts:
    36,166
    Likes Received:
    1,363
    Location:
    E-town baby!
    Torque is how much effort it takes to put your lug nuts on...hp is how long it takes you. /forums/images/graemlins/smile.gif

    Rene
     
  17. Thunder

    Thunder 3/4 ton status

    Joined:
    Jul 20, 2000
    Posts:
    8,946
    Likes Received:
    1
    Location:
    Northeast Nevada
    Horsepower= How fast you hit the wall

    Torque= How hard you hit the wall
     
  18. TSGB

    TSGB 1 ton status

    Joined:
    Apr 22, 2002
    Posts:
    12,527
    Likes Received:
    0
    Location:
    Centralia, Washington
    HP = Speed
    Torque = Power to get to HP
    No Torque and lots of HP = slow accel.
     
  19. NetBlazer

    NetBlazer Registered Member

    Joined:
    Apr 23, 2001
    Posts:
    90
    Likes Received:
    0
    Location:
    Littleton, CO
    Greg has it right, Torque is where it's at, HP is a number speed parts maunfacturers like to throw around /forums/images/graemlins/smile.gif

    I just had to get in on this post, because it's the subject of my .SIG
     
  20. HarryH3

    HarryH3 1 ton status Author

    Joined:
    May 31, 2000
    Posts:
    10,384
    Likes Received:
    2
    Location:
    Georgetown, TX
    From another thread:

    Without torque, there can be no horsepower. Torque is king! Horsepower is simply a number that is calculated, using torque and RPM as the main inputs. The formula is: Horsepower = ( Torque * RPM ) / 5252. So the only way to increase horsepower at a given RPM is to make more torque at that RPM.

    Here's a somewhat extreme example that illustrates the point quite nicely. If all it took to make a Subruban haul a$$ was horsepower, then GM could have just put Honda VTEC 4-bangers under the hood of Suburbans. I found some specs for a '95 Honda VTEC engine at http://www.webcom.com/wv/prelude/95specs/vtec.html for comparison. Suburbans of that era had factory HP ratings of about 210 HP, while the tiny Honda engine was rated at 190 HP. However, the 190 HP of the Honda engine would be begging for mercy if asked to drag around 6,000 pounds of Suburban. Why? Torque...

    The Suburban engine was rated at a torque peak of 300 lb/ft at just 2,800 RPM and made that 210 HP peak at 4,000 RPM. Meanwhile, the Honda had a torque peak of a measly 158 lb/ft and it didn't even manage to hit that peak until the engine reached 5,500 RPM! You have to wind the Honda out to 6,800 RPM to get to its HP peak of 190 HP. So while the HP numbers are similar, it's the torque that makes the difference.

    Here's a pretty decent article that a friend of mine wrote about HP and Torque. It explains the concepts pretty well: http://www.boston-bmwcca.org/bimmer/1999/03/horsepower-and-torque.asp

    I'll take a torque monster any day...
     

Share This Page