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    Results 21 to 29 of 29
    1. #21
      Join Date
      Mar 2009
      Location
      SoCal
      Posts
      1,240
      Country Flag: United States
      Quote Originally Posted by 67-LS1 View Post
      OK! Figured out how to attach the curve!

      I clearly don’t understand this, hence my OP and I do appreciate you guys trying to explain it. I know this formula is tried and true and has been since the invention of the horse.

      But then I see a curve like the attached and hopefully you can see why I ask the question. The HP curve rises as the torque curve remains flat.
      Thanks for posting the chart. The 5252.113 unit conversion is specific to ft-lbf and horsepower.

      For Newton-meters and kilowatts, the formula would be as follows:

      KW = Tq (Nm) * RPM / 9549.3
      Brett H.

      1979 Pontiac Firebird Trans Am
      1991 Mazda Miata
      2005 Ford Mustang GT

      1987 Ford Mustang GT - Sold 06-29-2014
      1988 Oldsmobile Cutlass Ciera - RIP 9-17-2011
      1992 Chevrolet Corvette - Sold 10-12-2017

    2. #22
      Join Date
      Sep 2008
      Location
      Jacksonville, Florida
      Posts
      629
      Country Flag: United States
      Quote Originally Posted by 67-LS1 View Post
      OK! Figured out how to attach the curve!

      I clearly don’t understand this, hence my OP and I do appreciate you guys trying to explain it. I know this formula is tried and true and has been since the invention of the horse.

      But then I see a curve like the attached and hopefully you can see why I ask the question. The HP curve rises as the torque curve remains flat.
      Lets just pick an RPM from the graph, say 1800 RPM. It's making roughly 350 Nm of torque, convert that to Lb. ft. and you get roughly 258 Lb. Ft.

      258 x 1800/5252 = 88 hp. At the same 1800 RPM on the graph, it shows 65 KW's of power, convert that to HP and guess what, 88 HP.

      Try it at any RPM point on the graph and you will get the same results. The formula with always be correct!!
      Craig Scholl
      CJD Automotive, LLC
      Jacksonville, Florida
      904-400-1802
      www.cjdautomotive.com

      "I own a Mopar, I already know it won't be in stock, won't ship tomorrow, and won't fit without modification."

    3. #23
      Join Date
      Jun 2001
      Location
      Orlando, FL
      Posts
      10,603
      Country Flag: United States
      Right -- just piling on here, but the relationship between HP, torque, and RPM isn't "tried and true". It's true by definition:

      1 horsepower is a unit of power equal to 550 foot-pounds per second (745.7 watts).
      John Parsons

      UnRivaled Rides -- Modern upgrades for your ride.

      UnRivaled Rides recent project -- LS9-powered 69 Camaro

    4. #24
      Join Date
      Jun 2012
      Location
      South Lyon, MI
      Posts
      1,217
      Country Flag: United States
      Quote Originally Posted by parsonsj View Post
      Right -- just piling on here, but the relationship between HP, torque, and RPM isn't "tried and true". It's true by definition:

      1 horsepower is a unit of power equal to 550 foot-pounds per second (745.7 watts).
      What he said!

    5. #25
      Join Date
      Jun 2001
      Location
      Newbury Park, CA
      Posts
      5,821
      Country Flag: United States
      Getting the units right in any engineering exercise may just save a life.

      Just sayin....

      VaporWorx. We Give You Gas http://www.vaporworx.com


    6. #26
      Join Date
      Jun 2012
      Location
      South Lyon, MI
      Posts
      1,217
      Country Flag: United States
      Quote Originally Posted by CarlC View Post
      Getting the units right in any engineering exercise may just save a life.

      Just sayin....
      I always wonder why by doctor and lawyer friends just "practice", when as an engineer I have to get it right every time.

    7. #27
      Join Date
      Nov 2016
      Location
      Sulphur, La
      Posts
      598
      Quote Originally Posted by cornfedbill View Post
      I always wonder why by doctor and lawyer friends just "practice", when as an engineer I have to get it right every time.
      Right every time... that's what the safety multiplier is for!

    8. #28
      Join Date
      Jun 2012
      Location
      South Lyon, MI
      Posts
      1,217
      Country Flag: United States
      Quote Originally Posted by CSG View Post
      Right every time... that's what the safety multiplier is for!
      Yup!

    9. #29
      Join Date
      Sep 2006
      Location
      Southern Indiana
      Posts
      4,699
      Country Flag: United States
      All engines power is measured by torque, we get HP by an equation. Physics isn't hard if you understand what hat there are some constants in the world.
      Lee Abel
      AFTERMARKET PERFORMANCE

      1977 Chevy Monza 2+2:Project "Cheap Trick"
      1978 C10 Long bed , On air and trailer puller
      2006 Buell Blast ,Just a bike to ride and for mileage
      1966 Caprice 4dr Sports Roof fact.327/now 350/SOON 454???? Project "II Old,,,ZERO BUDGET OR LESS CAPRICE!"

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