shoppintractors
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Torque VS. Horsepower
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AndyMA
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I'm not quite sure what you're asking. It appears to all be there in the graphs. Since hp is a function of torque and rpm's, the 30 hp engine has more torque at most if not all rpms. At rated speed, the 30hp has about 8 and the 25 hp has about 6.2 kg m of torque.
Andy
Andy
I'm lost on the question, the charts are not american either. but the top line would be tourqe,middle hp,and bottom fuel consumtion, in american that would be lbs per hp hr. but as a rule of thum torqure will rise with hp. Not always true but its the rule in general. diesel to diesel, gas to gas. if you compare diesel to gas the diesel will usualy have more torque for same hp. maybye that ansewers the question and maybye not, i was stumped on what you were asking
OP
shoppintractors
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<font color="blue">At rated speed, the 30hp has about 8 and the 25 hp has about 6.2 kg m of torque.
</font>
Is that going to be a noticable difference putting the power to the ground? Would that be an average or better than average torgue increase going from 25 to 30 hp. If the torgue is a substantial increase....How much would it be worth in dollars. $500, $1000, $1500?
Don
</font>
Is that going to be a noticable difference putting the power to the ground? Would that be an average or better than average torgue increase going from 25 to 30 hp. If the torgue is a substantial increase....How much would it be worth in dollars. $500, $1000, $1500?
Don
mahlers
Gold Member
A weird thing about that chart is that the units for torque don't make any sense. I thought that torque is Newton-meters, not kilogram-meters.
It is kind of interesting that the specific fuel consumption for the higher powered tractor is actually lower than the lower powered tractor.
It is kind of interesting that the specific fuel consumption for the higher powered tractor is actually lower than the lower powered tractor.
Mahlers i think the reason could be the effect of and this is unknown but the cu.in could be the same as well as cyl. numbers. so just to run the engine will take same hp. now add 5 hp and the lbs per hp fuel consumtion will be a little better because of the same moving mass in motor takes same hp to keep motor running. the extra hp can be put to work and not lost in motor. hard to explain on a computer,my mind and keyboard don't link to well
OP
shoppintractors
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I believe the PS stands for....... <font color="blue">Ps = Pferdestärke </font>
See an explanation.....Here
Don
See an explanation.....Here
Don
Henro
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Don,
If you want to compare the two you need to plot them both on one graph, with identical x and y axis.
These graphs are different and it is VERY difficult to compare what the graphs are showing.
You could take one graph, and plot the curves of the other on it, and then compare the lines for HP and Torque fairly easily.
Looking at them as they are now makes it a lot harder to do.
When plotted on one graph, I think you will find that both the torque and HP traces for the 25 HP engine will be below those of the 30 HP engine. Which is what would be expected.
You can actually see that looking at the ends of the curves of the two graphs as is.
Not sure if this helps or not. If both engine characteristics were plotted on the same graph, it looks like the torque curves might not be that different over the RPM range shown. The 30 hp engine torque would greater naturally, but the percent change with engine speed looks like it might be very similar.
If you want to compare the two you need to plot them both on one graph, with identical x and y axis.
These graphs are different and it is VERY difficult to compare what the graphs are showing.
You could take one graph, and plot the curves of the other on it, and then compare the lines for HP and Torque fairly easily.
Looking at them as they are now makes it a lot harder to do.
When plotted on one graph, I think you will find that both the torque and HP traces for the 25 HP engine will be below those of the 30 HP engine. Which is what would be expected.
You can actually see that looking at the ends of the curves of the two graphs as is.
Not sure if this helps or not. If both engine characteristics were plotted on the same graph, it looks like the torque curves might not be that different over the RPM range shown. The 30 hp engine torque would greater naturally, but the percent change with engine speed looks like it might be very similar.
OP
shoppintractors
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<font color="blue"> These graphs are different and it is VERY difficult to compare what the graphs are showing.
</font>
Now that I've studied these graphs a little more.....I see the 25hp reaches it greatest amount of torque of 7.25 kg m. @ 1700 rpm. The 30 hp reaches it's greatest amount of torque of 9.50 kg m @ 1700rpm.
30 hp maximizes torque of 9.50 kg m @ 1700 rpm
25 hp maximizes torque of 7.25 kg m @ 1700 rpm
How does 2.25 kg m greater torque in the 30 hp equate? Is 2.25 kg m worth moving upto the 30 hp motor.
For reference......
25 hp is 79.3 cu. in. (1299 cc) 3 cylinders
30 hp is 91.5 cu. in. (1500 cc) 3 cylinders
(This also demonstrates maximum "rpm" does not necessarily equal maximum "torque".)
Don
</font>
Now that I've studied these graphs a little more.....I see the 25hp reaches it greatest amount of torque of 7.25 kg m. @ 1700 rpm. The 30 hp reaches it's greatest amount of torque of 9.50 kg m @ 1700rpm.
30 hp maximizes torque of 9.50 kg m @ 1700 rpm
25 hp maximizes torque of 7.25 kg m @ 1700 rpm
How does 2.25 kg m greater torque in the 30 hp equate? Is 2.25 kg m worth moving upto the 30 hp motor.
For reference......
25 hp is 79.3 cu. in. (1299 cc) 3 cylinders
30 hp is 91.5 cu. in. (1500 cc) 3 cylinders
(This also demonstrates maximum "rpm" does not necessarily equal maximum "torque".)
Don