Whats the difference between BHP and TORQUE???
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09-06-2004, 03:31 PM
#14
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just thought i'd ask a random question, which i dont really know much about.
having 20 different answers
leaves me in the same boat....pmsl
having 20 different answers
leaves me in the same boat....pmsl
09-06-2004, 04:59 PM
#15
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Originally Posted by EscortWRC
BHP = (Torque x RPM) / 5252
Horsepower sells engines.....Torque wins races
Horsepower sells engines.....Torque wins races
cus it dont work out!....
09-06-2004, 05:13 PM
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Think about a pushbike.
The cyclist can produce a given amount of power, but the amount of torque can vary:
Start with the chain in the granny cog (the little one) on the pedal set and one rotation of the pedal will turn the back wheel (say) 2 times.
That is a lot easier to do than having the chain on the big cog, which might turn the rear wheel 3 times for each rotation of the pedal.
Both use the same power (BHP) but the little wheel needs less torque.
Then, once the bike is up to speed, you don't need as much torque to keep it moving at the same speed, so you go up to the big cog, using less torque. You also have to put less effort in for each rotation of the pedal while still maintaining the same speed.
That's why torque is a good thing to have lots of - to help with rapid accelaration, and BHP should be less important once you get to the desired speed.
The cyclist can produce a given amount of power, but the amount of torque can vary:
Start with the chain in the granny cog (the little one) on the pedal set and one rotation of the pedal will turn the back wheel (say) 2 times.
That is a lot easier to do than having the chain on the big cog, which might turn the rear wheel 3 times for each rotation of the pedal.
Both use the same power (BHP) but the little wheel needs less torque.
Then, once the bike is up to speed, you don't need as much torque to keep it moving at the same speed, so you go up to the big cog, using less torque. You also have to put less effort in for each rotation of the pedal while still maintaining the same speed.
That's why torque is a good thing to have lots of - to help with rapid accelaration, and BHP should be less important once you get to the desired speed.
09-06-2004, 05:28 PM
#18
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Spiky you tinker 
You know how long the last thread with this title ran, you know, "BHP vs Torque" that Phil started under a pseudonym
And I ain't saying it all again
Edit: I've just been to look for that post. It was in Technical archives I thought.....
.....can't find it anywhere
Stu??????????
You know how long the last thread with this title ran, you know, "BHP vs Torque" that Phil started under a pseudonym
And I ain't saying it all again
Edit: I've just been to look for that post. It was in Technical archives I thought.....
.....can't find it anywhere
Stu??????????
Il look around for it
09-06-2004, 05:51 PM
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09-06-2004, 10:12 PM
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torque is a rotational force. if you get your knuckle bar which is 1 foot long, and you exert 1lb weight on the end (notice i didnt say force...) then the torque acting on the nut or bolt is 1lb per foot - 1lb/ft
if you make the knuckle bar 2feet long, and put 10lb on the end, its 10lb x 2feet...so 20lb/ft.
power is just the torque times RPM, i forget the numbers, but i know 52 is in there somwhere!! but yeah...power is a factor of torque and speed.
a good way of looking at it, is spinning a bike wheel with it off the ground. in the lower gears, the torque on the wheel is more than in the lower hears. but you run out of chuff at a lower speed. if you go ina higher gear, its harder to start the wheel spinning because the torque applied to the wheel is less, but you can exert more power and keep it spinning at a higher speed.
im toss at explaining stuff but hopefully you understood that
if you make the knuckle bar 2feet long, and put 10lb on the end, its 10lb x 2feet...so 20lb/ft.
power is just the torque times RPM, i forget the numbers, but i know 52 is in there somwhere!! but yeah...power is a factor of torque and speed.
a good way of looking at it, is spinning a bike wheel with it off the ground. in the lower gears, the torque on the wheel is more than in the lower hears. but you run out of chuff at a lower speed. if you go ina higher gear, its harder to start the wheel spinning because the torque applied to the wheel is less, but you can exert more power and keep it spinning at a higher speed.
im toss at explaining stuff but hopefully you understood that
09-06-2004, 11:01 PM
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Originally Posted by RSrussell
bhp has 3 letters and torque has 6 
15 and 6 i say....
the other post was classic... please dont say its been lost?!!
10-08-2004, 08:58 AM
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Well i will try to add my 2 cents, but this will be hard as :
1) this is related to ooooold physics principles I learnt in my studies
and
2) I will try to explain them in english which is not my language
and
3) I may be 100% wrong in my answer ROFLMAO
As far as I know, what needs to be understood first is that torque is a rotating force, where bhp is a straight line force (vectorial).
Basically, torque is what makes it so that it's easier to unscrew a wheel nut with a long wrench rather than with a short one : the further you are from the center of the point you want to add the force on, the bigger the force will be. (same as with home door handles for instance, works better when you push at the end of the handle rather than when you push at the center of the axle ) This is torque.
Now, with bhp... as far as i remember, what needs to be known, is what 1 BHP actually IS !
1 BHP is the force that allows to pull a weight of 75 kilograms at 1 meter above the ground during 1 second.
Now, about cars... you can't have bhp without torque, nor torque without bhp. It's just a question of RPMs (yes... rotations. Remember torque is a rotating force ).... the lower RPMs the max bhp are available at, the more torque you will have.
What is sure, is that max torque and max bhp on a car (or on everything that has an engine) are closely related and can be calculated one from the other. I can't remember the exact formula, but if you know the max bhp of a car and the rpm they appear at, you can calculate very precisely the max torque too.
Hope this helps... pretty sure this is not very clear... forgive my english mistakes
1) this is related to ooooold physics principles I learnt in my studies
and
2) I will try to explain them in english which is not my language
and
3) I may be 100% wrong in my answer ROFLMAO
As far as I know, what needs to be understood first is that torque is a rotating force, where bhp is a straight line force (vectorial).
Basically, torque is what makes it so that it's easier to unscrew a wheel nut with a long wrench rather than with a short one : the further you are from the center of the point you want to add the force on, the bigger the force will be. (same as with home door handles for instance, works better when you push at the end of the handle rather than when you push at the center of the axle
) This is torque.Now, with bhp... as far as i remember, what needs to be known, is what 1 BHP actually IS !
1 BHP is the force that allows to pull a weight of 75 kilograms at 1 meter above the ground during 1 second.
Now, about cars... you can't have bhp without torque, nor torque without bhp. It's just a question of RPMs (yes... rotations. Remember torque is a rotating force
).... the lower RPMs the max bhp are available at, the more torque you will have.What is sure, is that max torque and max bhp on a car (or on everything that has an engine) are closely related and can be calculated one from the other. I can't remember the exact formula, but if you know the max bhp of a car and the rpm they appear at, you can calculate very precisely the max torque too.
Hope this helps... pretty sure this is not very clear... forgive my english mistakes
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