Looking4new
Super Member
- Joined
- Apr 8, 2012
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- 8,374
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- Northern Ontario, Canada
- Tractor
- 2012 Kioti CK27HST w/cab
Nice calculator, I saved that.
Peak torque ratings and associated rpm?
- Thread starter Mikkelsen
- Start date
GregP27
Bronze Member
Duplicate, sorry!
GregP27
Bronze Member
Torque and HP are directly related.
Torque = (HP * 5,252) / RPM or HP = (Torque * RPM) / 5,252. The relationship is exact.
Don't get confused by the 5,252. It is a conversion factor only, and comes from the fact that a 1-foot circle has a diameter of 6.2832 feet. Dividing 33,000 by 6.2832 gives you 5,252, which simplifies the equation and resolves the units. This constant is the reason that horsepower torque graphs ALWAYS cross at 5,252 RPM.
Torque is in pound-feet. 1HP = 33,000 ft-lbs / min or 550 ft-lbs / sec.
So, 43 HP @ 1,700 RPM = 132.8 lb-ft of torque at 1,700 RPM. Now if only we could get all that torque to the ground without wheelspin!
Torque = (HP * 5,252) / RPM or HP = (Torque * RPM) / 5,252. The relationship is exact.
Don't get confused by the 5,252. It is a conversion factor only, and comes from the fact that a 1-foot circle has a diameter of 6.2832 feet. Dividing 33,000 by 6.2832 gives you 5,252, which simplifies the equation and resolves the units. This constant is the reason that horsepower torque graphs ALWAYS cross at 5,252 RPM.
Torque is in pound-feet. 1HP = 33,000 ft-lbs / min or 550 ft-lbs / sec.
So, 43 HP @ 1,700 RPM = 132.8 lb-ft of torque at 1,700 RPM. Now if only we could get all that torque to the ground without wheelspin!
Last edited:
Buggs67
Veteran Member
On Page 5 it says my CH2510's engine makes max torque of 5.9 at 1900 rpm, but rated hp of 24 at 2600 rpm. And the torque/power chart shows essentially the same torque from 1000 rpm to 1900. Interesting and confusing.
EDIT: Interesting also that I do BH operations at 1800 rpm; always have based on advice on this site. But everything is slower at lower rpm, I guess because the pump is running slower.
Amvcane
Platinum Member
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- 2012 Kioti CK35hst tlb; 1988 JD 420; 1990 JD 322; 1987 JD 332; 1985 JD 318; 2010 JD ProGator 2030A;
I'm not sure which engine is in your ck2510. Kioti's website says 3a165LFB and Tractor Data says 3a139LFB. The boiler plate on the valve cover will tell the truth. We all know that Kioti's website has been inaccurate and inconsistent at times.
Those hp and torque curve graphs are blurry and hard to read, they start at 1600 rpms and go to 2600 rpms at 100 rpm intervals.
To make things worse there is no graph for the 3a139LFB engine. Not sure why they wouldn't include this in that literature.
Those hp and torque curve graphs are blurry and hard to read, they start at 1600 rpms and go to 2600 rpms at 100 rpm intervals.
To make things worse there is no graph for the 3a139LFB engine. Not sure why they wouldn't include this in that literature.