What is Horsepower and Torque?

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1. i kinda want to hear an explanation on 90s dohc honda motors the example is a 1.8 liter engine turbocharged fully built 700whp range but torque is somewhere around 400-450 ,i know those older honda engine are totally not known for torque i just want to hear the science behind it
2. If you want to compare diesel engine with petrol engine - the torque value of the first one should be divided approx. by 2 to get comparison. Because petrol engines hit the max HP and torque at twice rev. - which means the torque is applied twice in the same amount of time.
3. fuck you my mind got fucked watching this
4. Let's check the model in the video using METRIC UNITS and make some conclusion:
   
   Motor torque: 200 foot pound = 271.16 newton meter
   Rotational speed: 1000 RPM = 104.72 radian/second
   Rock mass: 200 pound = 90.718 kg
   Pulley radius: 1 foot = 0.3048 meter
   Lifting height: 6283 foot = 1,915 meter
   
   Now...what???
   
   Well...I need to deal with the ROPE'S FORCE that is pulling up the MASS of the rock against the GRAVITY FORCE that is pulling the rock downwards. Newton came up with a law about MOTION that is expressed by the formula F = m*a, where "F" is the force on a mass "m" causing an acceleration "a". From this formula you can also say that a = F/m. More force means faster acceleration and more mass means slower acceleration (as acceleration is force divided by mass).
   In other words, the rock will not be able to instantly get to any speed but will have to ACCELERATE.
   
   Let's call the force of the rope "Fr" and the force on the rock from gravity "Fg".
   Since torque is "force times arm (radius)" we can derive that the rope's pulling force is:
   
   Fr = t / r = 271.16/0.3048 = 889.6 Newton
   
   And the force of gravity on the rock is derived from Newton's law of motion involving the acceleration of dropping objects on planet earth g = 9.80665 m/s2 (standard gravity).
   
   Fg = m * g = 90.718 * 9.80665 = 889.6 Newton
   
   The effective force on the rock is therefore:
   
   Fe = Fr - Fg = 889.6 - 889. 6 = ZERO Newton => NO ACCELERATION = NO MOTION
   
   In other words, the ROCK WILL NOT MOVE AT ALL.
   
   Then comes the actual engine speed being 1000 RPM causing a rope speed of 2 * Pi * radius * 1000 / 60 = 31.92 meters per second, 115km per hour or 71 miles per hour. That's freaking fast!
   
   Hey, this engine needs a clutch to engage the load in some controlled way to get to that fast of a speed without stalling. But a clutch wont be enough to generate enough pulling force to overcome gravity and get the rock moving as described above. You also need a transmission that can help get the rope pulling force substantially above gravity. And there you go...as simple as this description is...in actuality it demonstrates why we need a transmission and clutch. And the actual lifting time entirely depends on how effective those components will be much like what defines a fast accelerating car.
   
   Alright, let's assume that the rock gets to its 115km/h or 71mph speed through some sort of CVT type transmission and clutch. And let's assume we don't slow it down at the top using the engine. In reality this means the rock will have gained some energy both in terms of KINETIC ENERGY "Ek" (motion) and POTENTIAL ENERGY "Ep" (against gravitation at the height "h"):
   
   Ek = m * v * v / 2 = 90.718 * 31.92 * 31.92 / 2 = 46216 Joules
   Ep = m * g * h = 90.718 * 9.80665 * 1915 = 1703660 Joules
   Et = Ek + Ep = 1749876 Joules
   
   If we assume we have some magic transmission that allows the 38 horsepower "P" to be effective at all time, the travel time is minimum:
   
   Time = Et / P = 1749876 / (38 * 745.7)= 61.8 seconds
   
   So, yes, the theoretical best case travel time is more than 60 seconds and if you add air drag and transmission efficiency into the equation, it gets much worse. But this can't be calculated without knowing details about the rock's shape and the transmissions characteristics. This is somewhat like doing a car race up a hill.
   
   And before anyone try to replicate this, realize that the almost 2km of rope will mess everything up.
5. Can you do it without the retarded units please?
6. cool video. Thanks for making it.
7. but how come some engines have a much lower torque than horsepower?
8. best video easy explanation
9. Is the cylinder volume not important to torque? I mean a truck motor with lets say 400hp 20 Liter can deliver more torque at its peak then an audi 4 Liter 400hp.
10. essentially Does anybody see bigger this video @"omg
11. Torque = Strength
    
    RPM = Speed
    
    ??????????
12. Pounds and feet? XXI century calling bro Lol
13. Any way of getting the metric values? I have no idea how large a foot is and I also have no idea how much a pound is.
14. This helped me a lot .. I was wondering why my Nissan GT-R was reaching top speed slower then my aventador .... (need for speed)(I'm 13 don't judge)
15. why does the angle of cylinder matters, e.g., on a lamb0, most have a 60 degree angle, but on other cars, they are 90 degrees, what's that matter
16. to me torque is movement of force. when your already moving and floor it how fast the car reaches speed.
17. does this mean 2000hp and 20nm of torque would be a waste compared to 1000hp and 100nm
18. i will give a simple example
    Horse power is how fast you hit a wall and Torque is how far you take the wall with you
19. stupid imperial units
20. Exercise except half prevention bank database grab wrong extraordinary.