Peak torque ratings and associated rpm?

[Mikkelsen]

Why are manufacturers not listing peak torque ratings? What RPM does a Kioti DK5510 reach peak torque?

 

[lescarpentier]

Kubota does,however the RPM in which it is reached is not listed.

 

[buickanddeere]

2/3 to 3/4 of the rpms for max HP is a safe estimate.

 

[buickanddeere]

Kubota does,however the RPM in which it is reached is not listed.

Bore/Stroke: 3.43x4.03 inches [87 x 102 mm]
Power (gross): 55 hp [41.0 kW]
Fuel system: common rail direct injection
Rated RPM: 2600
Torque: 133.5 lb-ft [181.0 Nm]
Torque RPM: 1700

Also makes 43 HP at 1700 rpm.

 

[Mikkelsen]

Perfect, thanks Buick and Deere. Is that for the kubota? I imagine the Kioti would be similar?

 

[buickanddeere]

Perfect, thanks Buick and Deere. Is that for the kubota? I imagine the Kioti would be similar?

Kioti DK5510

 

[Amvcane]

Never posted a link before, but I found this http://vi.dzima.com/wp-content/uploads/2015/01/Daedong-Kioti-Data3.pdf

1700 rpms for the 3F183T engine family.

 

[Mikkelsen]

You guys are awesome.

 

[ksbrdmkr]

If you want to learn more about tractor performance go the the Nebraska tractor test site. Here is a link to my New Holland TN 55D, it shows a 38% torque rise at 1100rpm. http://tractortestlab.unl.edu/documents/NH TN55d.pdf

 

[RinconVTR]

You only need HP or Torque @ a known RPM to reverse calculate whatever (HP or lb/ft) is missing.

If you know an engine makes 25hp @ 2600rpm for example, than a simple calculation can be used to find this equates to 50.5 ft/lbs of torque.

Here's an online calculator...no math required. :thumbsup:

Horsepower & Torque Calculator | Spicer Parts


IMO when it comes to tractors, HP is typically used for power output ratings and high torque is obtained with gearing and hydraulics.