torque power determines fast
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i would like to fix the misconception that i have recently:
that bus horsepower is what makes bus goes fast. but dave tell me its torque power number in terms of the newton metre.
also other variables will contribute to whether the pick up and how fast a bus moves besides the torque number. but its the most important.
does not mean the 310HP scania K310UB cannot be beaten by a 261HP scania N113CRB in terms of fastness
meanwhile thanks dave
ZYX -
Well, it really depends. If the 261 Hp bus got a good gear box and a light body work, it will go faster than the 310Hp bus with a heavy body work and a lousy gear box. Holding all other factors constant, the 310Hp bus will go faster.
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Simplified:
Well, if you are talking about top speed, the maximum RPM directly correlates (after factoring in the gearbox and drive axle ratios) to it.
Torque will determine how fast you get to top speed.
Power = (pre-determined factor) times (torque) times (rotation per unit time) -
torque = shiok
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torque will determine if your bus can actually move from a stationary position.
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That's right.
There's no point having a small-capacity 300hp engine when you've only got 900Nm of torque (maximum) available only at high rpm to play with. In this case, a 250hp engine with 1100Nm of torque available at low rpm will always accelerate quicker.
Another very important variable is the driveline - gearboxes and axles. The final drive ratio combined with the choice of gearbox will greatly affect final acceleration ability.
The top speed of a vehicle is affected by the top gearbox ratio, the final drive ratio, and engine revs.
Regards,
Dave -
Torque means how fast it will accelerate within a set speed.
HorsePower means how powerful it is,determine the top speed and higher speed acceleration partly
There's still alot of factors to determine the overall top speed and acceleration such as gearbox ratios and etc etc so dont count on it alone. -
Regarding axles , why is the Mercedes Benz's O405 rear axle a hub reduction axle? I remembered that hub reduction reduces rotational speed , but enhances torque . Is that true ?Originally posted by Powered_By_CNG:That's right.
There's no point having a small-capacity 300hp engine when you've only got 900Nm of torque (maximum) available only at high rpm to play with. In this case, a 250hp engine with 1100Nm of torque available at low rpm will always accelerate quicker.
Another very important variable is the driveline - gearboxes and axles. The final drive ratio combined with the choice of gearbox will greatly affect final acceleration ability.
The top speed of a vehicle is affected by the top gearbox ratio, the final drive ratio, and engine revs.
Regards,
Dave