Why is torque divided 5252?
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Why is torque divided 5252?
No constants like 5252 are present in it. The reason is that the units are included in physical quantities. In the SI system commonly used in physics, power is in Watts, torque is in Newton-metres, and angular speed is inverse seconds or radians per second. This means that 1 Watt= 1 Newton.
What is the constant 5252?
The number 5,252 is the result of lumping several different conversion factors together into one number. First, 1 horsepower is defined as 550 foot-pounds per second (read How Horsepower Works to find out how they got that number). The units of torque are pound-feet.
What rpm does horsepower and torque cross?
5,252 RPM
They’re interwoven, important for the speed and acceleration of your vehicle, and the desire of every gearhead. You take your car to the dyno, and you notice that torque and horsepower cross paths at 5,252 RPM.
How is 5252 derived?
The constant “5,252” is derived from the fact that a circle 1 foot in diameter has a circumference of 6.2832 feet. Dividing 33,000 by 6.2832 results in 5,252 and resolves the units for the equation.
Why is torque and horsepower the same at 5252 rpm?
It’s related to how much work a horse will do related to the same work done by a steam engine. One horsepower is equal to 33,000 foot-pounds of work per minute. Add in the equations relating to torque and velocity, and you’ll find that horsepower always equals torque multiplied by rpm, divided by 5,252.
Why does torque decrease with RPM?
Torque decreases after certain rpm, not only due to decreasing fuel air consumption(since engine gets less time to breath), but also due to gear variation . When the engine running at second gear it’s torque will be more, this is why we will drive vehicle at second gear during uphill driving.
Why is HP 5252?
It all boils down to the math behind both horsepower and torque. One horsepower is equal to 33,000 foot-pounds of work per minute. Add in the equations relating to torque and velocity, and you’ll find that horsepower always equals torque multiplied by rpm, divided by 5,252.
Why is dynamometer used?
A dynamometer, or “dyno” for short, is a device for measuring force, moment of force (torque), or power. A dynamometer can also be used to determine the torque and power required to operate a driven machine such as a pump.
Mathematically, horsepower equals torque multiplied by rpm. H = T x rpm/5252, where H is horsepower, T is pound-feet, rpm is how fast the engine is spinning, and 5252 is a constant that makes the units jibe. So, to make more power an engine needs to generate more torque, operate at higher rpm, or both.
Why does torque increase with RPM?
According to Newton’s second law, the summation of torque=Moment of inertia * Angular Speed (RPM). As the moment of inertia is constant, the torque is proportional to the angular speed. Therefore, If the the RPM increases, the torque increases.
How do you calculate horsepower from torque and Rev?
1 HP = 5252 lb-ft x 1 rev / 1 min which is the same as: 1 HP = 5252 lb-ft x 1 RPM. So, Horsepower = Torque x RPM / 5252. If you’ve rear this far I applaud you, since you now know where 5252 comes from and why the HP and Torque curves cross each other.
What is the difference between torque and HP?
Going back to the formula: HP = (Torque x RPM) / 5252 we can see that at an engine speed of 5,252 RPM Torque and HP are equal. That’s why when we see a graph of Torque / HP we see the lines always cross exactly at 5252 RPM. But where does the 5252 come from? Watt’s definition for HP says: 1 HP = 550 lb-ft / sec, or 1 HP = 550 lb x 1 ft / 1 sec
What RPM do you think the torque and horsepower should cross?
If you look at a lot of dyno charts, you’ll notice that horsepower and torque always seem to cross around 5252 RPM. Seriously. Just search Google Images for dyno charts and you’ll be blown away by how often this is the case.
How much more HP does a 2500 rpm engine have?
It could be 85 PS at 3000 rpm and it would still be better (and probably a lot more torque-y!) I pick the “flexible” engine, in the above chart, because in the 1000 to 2500 rpm range it has up to 30\% more hp and in the 2500 to 4500 rpm range it has up to 15\% more HP. Why do I prefer this?