Does anyone know what the horsepower ratings for the Yanmar tractors represent? PTP hp, drawbar hp, engine hp, or ?? For instance a YM2610 is listed at 30 hp in several sites on the net. I have seen several explanations that say the first two letters of the model number repesent the power in hp or killowatts but none of them seem to make sense. Thanks
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Horsepower
- Thread starter dgburgess
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mark777
Veteran Member
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- Ym1300d-1401D-1601D , 1610D & Massey Ferguson 1020
dgburgess,
YM series 4 digit numbered tractors show the first two numbers as PTO HP. Yours would be 26 PTO hp. You can multiply 1.2 times your PTO hp (26) to indicate your engine HP. EX: 1.2 x 26 = 31.2 engine HP. It is my understanding that this is a general rule, but not an absolute given the circumstances of rpm and load.
Hope this helps, Mark
YM series 4 digit numbered tractors show the first two numbers as PTO HP. Yours would be 26 PTO hp. You can multiply 1.2 times your PTO hp (26) to indicate your engine HP. EX: 1.2 x 26 = 31.2 engine HP. It is my understanding that this is a general rule, but not an absolute given the circumstances of rpm and load.
Hope this helps, Mark
normde2001
Elite Member
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These being gray market tractors, built in Japan for japan, I'm pretty sure they do not rate machines by horsepower as we in the US know it, probably kilowatts, or whatever. That's why the big discrepancy in what the hp is thought to be. Mark's explanation is generally accepted by US owners for the hp rating.
DavesTractor
Elite Member
I agree on the ratings being PTO HP and the 1.2 factor. They are not kilowatts, although that is a popular belief. They are rated as PS, which is essentially HP. 1.2 x PTO HP gives you a fairly close estimation of gross engine HP. Some examples prove this, such as the YM1300 = the US YM155. The USA models being rated at gross engine HP. Also take the YM1510 = YM186, the YM2000 = YM240 and the YM1401 = YM169. All of these generally support the 1.2 theory.
Thanks for the tip. When I read the term PS I remembered one of the spec sheets I found on the net had the column listed as PS. With a little digging in my old textbooks and the net I found out that PS is the abbreviation for metric horsepower.
pferdestärke (ps)
German word for horsepower, meaning the metric horsepower. The symbol ps is used for horsepower in both the Japanese and German automotive industies.
A metric horsepower = .98 hp
Not only do I have a valid formula but I also understand where it came from.
Thanks to all
pferdestärke (ps)
German word for horsepower, meaning the metric horsepower. The symbol ps is used for horsepower in both the Japanese and German automotive industies.
A metric horsepower = .98 hp
Not only do I have a valid formula but I also understand where it came from.
Thanks to all
cfoxmd
Silver Member
yeah ps horsepower is only slightly less than our hp (bhp- brake horse-power).
I find this thread interesting. I've looked at grey market tractors and come up with exactly the same question: why are the horsepower ratings inflated relative to the model number? At first I thought the model number was PTO horsepower but now I believe this is incorrect.
As an example, a local dealer has a YM2200. I don't know what he claims the horsepower to be; however this model is typically promoted on the internet by many as a 25 hp tractor. But looking at the engine block on the local tractor is a data plate in Japanese. I can't understand any of it, except for one bit: 22 PS. One of the previous posters explained this correctly, pferdestarke "strong horse" is the metric horsepower rating. But German horses aren't as strong as US horses apparently so in this example it converts to 21.5 HP.
If you go to the Yanmar japanese website (www.yanmar.co.jp/english), you can see that the current tractor model numbers match the engine output in PS, and in fact Yanmar does not publish the PTO output. So I think that argument that the model number is PTO horsepower is wrong.
I would guess it's the rated speed that is the basis for inflating the horsepower. As an example the Deere 2210 and the Yanmar KE-200H both have the Yanmar 3TNE74 engine and both are the same displacement. The KE-200H is rated 14.7 kW @ 2550 rpm; the 2210 is rated 17.1 kW @ 3000 rpm. The increase in horsepower is very close to being proportional to the speed increase.
But what is the significance of the two speeds and why is the practice different between the two countries?
As an example, a local dealer has a YM2200. I don't know what he claims the horsepower to be; however this model is typically promoted on the internet by many as a 25 hp tractor. But looking at the engine block on the local tractor is a data plate in Japanese. I can't understand any of it, except for one bit: 22 PS. One of the previous posters explained this correctly, pferdestarke "strong horse" is the metric horsepower rating. But German horses aren't as strong as US horses apparently so in this example it converts to 21.5 HP.
If you go to the Yanmar japanese website (www.yanmar.co.jp/english), you can see that the current tractor model numbers match the engine output in PS, and in fact Yanmar does not publish the PTO output. So I think that argument that the model number is PTO horsepower is wrong.
I would guess it's the rated speed that is the basis for inflating the horsepower. As an example the Deere 2210 and the Yanmar KE-200H both have the Yanmar 3TNE74 engine and both are the same displacement. The KE-200H is rated 14.7 kW @ 2550 rpm; the 2210 is rated 17.1 kW @ 3000 rpm. The increase in horsepower is very close to being proportional to the speed increase.
But what is the significance of the two speeds and why is the practice different between the two countries?
Villengineer
Gold Member
I believe that that HP and PS ratings are normally given at 540PTO rpm. The JD probably is "geared" lower on the PTO, ie. it takes a higher engine speed to achieve 540rpm at the pto shaft. Hope that makes sense.
