My 1500 hp ???????

[Tchamp]

I have seen different sites on the web selling the MY1500 and some advertise different engine hp. I was under the assumption that they were all 15 hp but like the one here it claims 18 hp. Are some of the tractors outfitted with larger hp than 15? If so how do i find out which mine is ?

 

[bmaverick]

I have seen different sites on the web selling the MY1500 and some advertise different engine hp. I was under the assumption that they were all 15 hp but like the one here it claims 18 hp. Are some of the tractors outfitted with larger hp than 15? If so how do i find out which mine is ?
View attachment 679560

The engine Hp has it's rating, some place 2Hp to 4Hp above 15Hp (depends on fuel injector type on the machine). The PTO should be 15Hp output.

This is the best definition I can give you from all the manuals and the fuel/hydraulic pump guy's feed back I've read on our Yanmar forums.

 

[California]

The difference in hp rating for the Japan-version Yanmars is this: The near-universal application for these small tractors in Japan is to permanently mount a rototiller for small rice plots. And the tillers need a specified input horsepower. So the tractor model names, and the marketing, specify the PTO hp.

In contrast, tractors in the US are marketed using the dynamometer horsepower, same as car engines have been rated for 100 years. Naked engine on a test stand, maybe no fan or belt-driven components at all. No transmission power losses. Maybe no allowance for heat increase that would overwhelm the cooling system in its real-world application. In other words, US hp is a marketing number.

Considering all that - there is one Yanmar model that uses the identical engine in Japan and US tractors. YM2000 (20 PTO hp) is YM240 (24 dyno hp) in the US. Based on this known 20% conversion factor, many gray market Yanmars are marketed using the US-equivalent hp rating, so they can be compared with other tractors available here. YM1500 is '18 horsepower' etc.

 

[bmaverick]

The difference in hp rating for the Japan-version Yanmars is this: The near-universal application for these small tractors in Japan is to permanently mount a rototiller for small rice plots. And the tillers need a specified input horsepower. So the tractor model names, and the marketing, specify the PTO hp.

In contrast, tractors in the US are marketed using the dynamometer horsepower, same as car engines have been rated for 100 years. Naked engine on a test stand, maybe no fan or belt-driven components at all. No transmission power losses. Maybe no allowance for heat increase that would overwhelm the cooling system in its real-world application. In other words, US hp is a marketing number.

Considering all that - there is one Yanmar model that uses the identical engine in Japan and US tractors. YM2000 (20 PTO hp) is YM240 (24 dyno hp) in the US. Based on this known 20% conversion factor, many gray market Yanmars are marketed using the US-equivalent hp rating, so they can be compared with other tractors available here. YM1500 is '18 horsepower' etc.

One of the only few YM-Series machines to compare is the YM2500 in Yanmar red paint to it's twin in John Deere green paint is the JD850. Same engine, same PTO, same, same, same. The Nebraska test shows this info.
JD850 TractorData.com John Deere 85 tractor tests information
YM2500 TractorData.com Yanmar YM25 tractor engine information
YM2610 TractorData.com Yanmar YM261 tractor engine information Sibling with PowerShift

Having owned both machines, JD850 & YM2610, working on them, using them, hours of reading both their manuals, there isn't much difference under the hoods.

The Nebraska Test is based on SAE and ASAE standards. Now, like California stated, those are different than Yanmar's rating using the JIS standards.

When you look at just the Nebraska Test, you will indeed see the max. Engine Hp of 20.66 and the PTO at 14.26. About a 6Hp difference geared out from the crankshaft.

Now, there are 2 flaws in this published test. Under the varying power and fuel consumption, the Power Hp of 0.00 and 9.89 are false readings. Either the data points in the test equipment went screwy or the data entered manually from the test was in error. (back then things were ANALOG and not DIGITAL. And most test devices were hand written onto paper. :confused2:

I really like the 3T80 engine. And it has very similar power attributes to the 3T84 rScotty has mentioned in the past. The bore and stroke are very close between the two.

 

[Tchamp]

The difference in hp rating for the Japan-version Yanmars is this: The near-universal application for these small tractors in Japan is to permanently mount a rototiller for small rice plots. And the tillers need a specified input horsepower. So the tractor model names, and the marketing, specify the PTO hp.

In contrast, tractors in the US are marketed using the dynamometer horsepower, same as car engines have been rated for 100 years. Naked engine on a test stand, maybe no fan or belt-driven components at all. No transmission power losses. Maybe no allowance for heat increase that would overwhelm the cooling system in its real-world application. In other words, US hp is a marketing number.

Considering all that - there is one Yanmar model that uses the identical engine in Japan and US tractors. YM2000 (20 PTO hp) is YM240 (24 dyno hp) in the US. Based on this known 20% conversion factor, many gray market Yanmars are marketed using the US-equivalent hp rating, so they can be compared with other tractors available here. YM1500 is '18 horsepower' etc.

Sweet, then i have a 18 hp tractor with a 15 hp output at the pto, or there about.

Does this mean i can put in larger injectors and increase my hp even more? I know i will most likely have to install the water pump upgrade but i think it would be worth it over all.

 

[California]

Sweet, then i have a 18 hp tractor with a 15 hp output at the pto, or there about.

Exactly.

 

[California]

...I know i will most likely have to install the water pump upgrade but i think it would be worth it over all.

Put in a few months using it before modifying anything. If the cooling system is maintained properly its designed so you could run that flat out continuously, powering a ditch pump or something. Homeowner use isn't nearly as hard. Just get the radiator rodded out if needed and watch the unusual spec for antifreeze proportion. I hate to see people tear into 40 year old gear that doesn't need anything. Its already designed perfect.

 

[Spiros]

On the side of the engine block there should be a metal tag with the engine type number on it. It will give the engine number and its hp@rpm.

 

[Tchamp]

On the side of the engine block there should be a metal tag with the engine type number on it. It will give the engine number and its hp@rpm.

Thank you for the info. Greatly appreciated.

 

[Tchamp]

Put in a few months using it before modifying anything. If the cooling system is maintained properly its designed so you could run that flat out continuously, powering a ditch pump or something. Homeowner use isn't nearly as hard. Just get the radiator rodded out if needed and watch the unusual spec for antifreeze proportion. I hate to see people tear into 40 year old gear that doesn't need anything. Its already designed perfect.

I understand what you are saying, as in anything I will prove it before I change it. It may not need anything and be fine just as it is, but it is nice to know that I can if needed.