What does engine torque mean to you?

tiganasfx

Known Member
Dec 14, 2010
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Well take the above example:

Assuming car A has 160Nm or torque @ 4000RPM
Assuming car B has 160Nm of torque @ 6500RPM

160Nm = 118lb-ft

Car A = 118*4000/5252 = 89.9hp
Car B = 118*6500/5252 = 146hp

As expected car B has higher hp @ higher rpm with the same torque.

At rpm=5252, the Hp = Torque (lb-ft) and the two graphs should intersect.
 

mines998

1,000 RPM
Thread starter
Dec 1, 2010
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If base on this dyno chart what figure I should take to make the calculation? Sorry I abit stupid can anyone enlighten me?
 

vr2turbo

Beyond 20,000 RPM!
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May 11, 2010
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Don't understand either. Then why diesel engine have better torque, if you say they are the same as petrol??
Some engine have max torque at lower rpm? How to explain?
Diesel also have their max at lower rpm?
 

mines998

1,000 RPM
Thread starter
Dec 1, 2010
1,048
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663
Kuala Lumpur
mines998 said:
If base on this dyno chart what figure I should take to make the calculation? Sorry I abit stupid can anyone enlighten me?
I not sure my calculation is correct or not which 1 I should refer to?

67.4kg/m = 660.5nm
660.5@4922
660.5 X 4922 / 5252 = 618HP?

52.0kg/m = 509.6nm
509@5458
509.6 X 5458 / 5253 = 529HP?
 

D7zul

2,000 RPM
Senior Member
Feb 24, 2011
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I not sure my calculation is correct or not which 1 I should refer to?

67.4kg/m = 660.5nm
660.5@4922
660.5 X 4922 / 5252 = 618HP?

52.0kg/m = 509.6nm
509@5458
509.6 X 5458 / 5253 = 529HP?
Well take the above example:

Assuming car A has 160Nm or torque @ 4000RPM
Assuming car B has 160Nm of torque @ 6500RPM

160Nm = 118lb-ft

Car A = 118*4000/5252 = 89.9hp
Car B = 118*6500/5252 = 146hp

As expected car B has higher hp @ higher rpm with the same torque.

At rpm=5252, the Hp = Torque (lb-ft) and the two graphs should intersect.


i think HP is calculated with LB-FT..

:biggrin:


then again, the calculation i think is only for estimation only.. I THINK..

the real torque should be tested on a dyno :biggrin:
 

tiganasfx

Known Member
Dec 14, 2010
84
9
508
Kuala Lumpur
I not sure my calculation is correct or not which 1 I should refer to?

67.4kg/m = 660.5nm
660.5@4922
660.5 X 4922 / 5252 = 618HP?

52.0kg/m = 509.6nm
509@5458
509.6 X 5458 / 5253 = 529HP?
Your scale is wrong... One "Horsepower" is defined as 33,000 lb-ft per minute which is an Imperial Unit. Therefore your torque should also be in lb-ft (imperial) not nm (metric).

67.4kg/m = 487.5 lb-ft = 456.8 hp @ 4922 rpm
52.0kg/m = 376.12 lb-ft = 390.87 hp @ 5458 rpm

The graph should have both the power measured in horsepower and the torque in foot pounds with both lines shown on the same axes. For example a typical graph....
 

DeaconFrost

Known Member
Senior Member
Oct 2, 2009
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The legendary diesel Audi R10:



Never revealed it's official torque figure, or did they?

Next time I see a diesel Merc, I better beware. It spits black smoke... and 400Nm: so that it makes sure the smoke that everybody eats is black.
 

D7zul

2,000 RPM
Senior Member
Feb 24, 2011
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Shah Alam
Don't understand either. Then why diesel engine have better torque, if you say they are the same as petrol??
Some engine have max torque at lower rpm? How to explain?
Diesel also have their max at lower rpm?

i think in the early days when petrol engine was design.. they use d engine in all cars..

then, a wise man said.. "hey.. why don't we built a bus or lorry that can carry a lot of people or stuff.."

then they put petrol engine in a bus and carry lots of people and stuff..

very quickly they notice that the petrol engine is not powerful enough to carry heavy things..

after that Rudolf Diesel design an engine that is powerful enough for that purpose in 1893

the engine we know now as the 'Diesel Engine'..

The end..
 

tiganasfx

Known Member
Dec 14, 2010
84
9
508
Kuala Lumpur
i think HP is calculated with LB-FT..

:biggrin:


then again, the calculation i think is only for estimation only.. I THINK..

the real torque should be tested on a dyno :biggrin:
Haha not really.... because there is in fact no way of directly measuring power and all types of dynamometer measure torque and then power is calculated from the formula - BHP = Torque (ft/lbs) x rpm/5252.

Try this... HowStuffWorks "Measuring Horsepower"
 

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