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5,250 (rpm) AND bust!

This is a discussion on 5,250 (rpm) AND bust! within the General Help forums, part of the LSx Technical Help Section category; I've been seeing everywhere people saying that the horsepower and torque curves meet at 5,250 rpm. What if an engine ...

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    Senior Member Whamhammer's Avatar
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    5,250 (rpm) AND bust!

    I've been seeing everywhere people saying that the horsepower and torque curves meet at 5,250 rpm. What if an engine can't rev that high, such as the Olds 307 code Y V8, thats horse power peaks at 3,200 rpm and torque peaks at 2,000, or some of the low revving diesels that don't rev to 5,250? Do the curves never meet, or do they actually meet at lower revs?

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    Former Mopar Man 2002ssslp's Avatar
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    All Torque and horsepower curves meet at some point but what I think you are referring to is the optimum rpm to shift and that all depends on the engine and set up. Diesels have a much lower torque band then a gasoline engine and therefore must be shifted at a different RPM. Sound and feel is a good way to determine when you need to change gears.
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    Senior Member Whamhammer's Avatar
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    Quote Originally Posted by 2002ssslp View Post
    All Torque and horsepower curves meet at some point but what I think you are referring to is the optimum rpm to shift and that all depends on the engine and set up. Diesels have a much lower torque band then a gasoline engine and therefore must be shifted at a different RPM. Sound and feel is a good way to determine when you need to change gears.
    I'm referring to how just about everyone says the curves must meet at 5,250 rpm. If I remember right, the code Y 307 I had redlined at 3,800 rpm. I dont see that engine, and others that were similar in power/redline ranges making it to 5,250. Do those engines just never see thier hp/tq curves meet?

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    It's physics and the formula. Look up any curve for any motor and you'll see they always cross there. It's mathematically impossible for them not to.

    (Torque * RPM )/5250 = HP.

    If a motor does not rev to 5250, then the graph will not show them crossing.
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    It's on jackstands.

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    Senior Member Whamhammer's Avatar
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    Quote Originally Posted by 35th-ANV-SS View Post
    It's physics and the formula. Look up any curve for any motor and you'll see they always cross there. It's mathematically impossible for them not to.

    (Torque * RPM )/5250 = HP.

    If a motor does not rev to 5250, then the graph will not show them crossingn.
    Thats exactly what I was looking to find out, thanks 35th!

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    Talking physics on the Board... as I recall that is not the first formula that Jon has posted. Darn engineers.

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    Veteran 0rion's Avatar
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    Quote Originally Posted by 35th-ANV-SS View Post
    It's physics and the formula. Look up any curve for any motor and you'll see they always cross there. It's mathematically impossible for them not to.

    (Torque * RPM )/5250 = HP.

    If a motor does not rev to 5250, then the graph will not show them crossing.
    I knew that.....but then again.....I know almost everything. I say "almost" only because I'm married and my wife is the only one that truly knows everything.

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    Moderator 35th-ANV-SS's Avatar
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    Quote Originally Posted by 0rion View Post
    Quote Originally Posted by 35th-ANV-SS View Post
    It's physics and the formula. Look up any curve for any motor and you'll see they always cross there. It's mathematically impossible for them not to.

    (Torque * RPM )/5250 = HP.

    If a motor does not rev to 5250, then the graph will not show them crossing.
    I knew that.....but then again.....I know almost everything.
    You and 5.0THIS should go on Jeopardy.
    RONS98TA likes this.

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    I will second that motion.

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