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Thread: Torque & Horsepower curves

  1. #1
    comin' unscrewed
    Can anyone here tell me why the torque and HP curves of any given engine always cross at 5250 RPM?

  2. #2
    Senior Member
    Join Date
    Feb 2009
    Posts
    2,626
    The answer to your question can be found in this thread:
    http://free.***boat.net/ubb/Forum1/HTML/001434.html

  3. #3

  4. #4
    Infomaniac
    Looks like that link was a question for me. I did not see it until now.
    Torque is a mechanical measurement done on a dyno.
    Horsepower is a mathmatical calculation. To calculate horsepower you use the torque and the RPM. The constant is 5252.
    So torque and HP are always equal at 5,252 RPM
    This is extremely important to know when you select engine parts. The RPM you intend to operate the engine at will tell you if you should shoot for torque or horsepower.
    Most boats engines(not outboards)should be built for maximum torque. Car boats as HB calls them.
    need a spell check on these posts.
    [This message has been edited by Infomaniac (edited May 15, 2002).]

  5. #5
    GasTurbine
    Originally posted by comin' unscrewed:
    Can anyone here tell me why the torque and HP curves of any given engine always cross at 5250 RPM?
    This is most certainly not true for "any given engine"...
    I think you meant to say "piston" engine. http://free.***boat.net/ubb/smile.gif

  6. #6
    Infomaniac
    Maybe he should have said reasonably affordable engine http://free.***boat.net/ubb/smile.gif

  7. #7
    GasTurbine
    Originally posted by Infomaniac:
    Maybe he should have said reasonably affordable engine http://free.***boat.net/ubb/smile.gif
    Contray...I can get fresh 1150hp T-53s for about $3000.00.
    And they will pump out that 1150hp all day long, with no complaints, little wear, and little chance of breaking. In fact...they are more at home at 100% than anywhere else.
    How long would a 1000hp+ piston engine stay together running at redline with a full load?
    Methinks, not so long. http://free.***boat.net/ubb/smile.gif
    To each their own tho...as long as we are in the water, and havin' fun!
    Happy Boatin'!

  8. #8
    mister460
    Hey Gas, I'll take two!!!

  9. #9
    GasTurbine
    Originally posted by mister460:
    Hey Gas, I'll take two!!!
    If your serious...email me. I havnt check stock for a while, but I can find out ASAP.
    He also had some 1350hp units as well.
    You *do* know the down side to turbines dont you?
    1. Terrible milage (ours get 2 gallon per mile @ 100%...yes...you read that right)
    2. Noise...there hidiously loud.
    If you can live with that, you can have an indestructable plant that will last for years and years under heavy use.
    Happy Boatin'!

  10. #10
    Stupid Fast
    Hey Gas turbine, I see that you are from the same area as me. Where do you boat? I would love to check out your rig.
    Drop Me an email. Way cool boat.
    Eric
    [This message has been edited by Stupid Fast (edited May 16, 2002).]

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