HP loss

Donald Lehman · May 9, 2016

Was snooping around tractordata and some of those big articulateds lose a LOT of horsepower between the fly wheel and the drawbar, don't they??? Wow!

gene bender · May 9, 2016

Look what HP it takes just for the hy system.

buickanddeere · May 9, 2016

(quoted from post at 11:39:47 05/09/16) Was snooping around tractordata and some of those big articulateds lose a LOT of horsepower between the fly wheel and the drawbar, don't they??? Wow!

They all loose power between the flywheel and drawbar or pto. Rolling friction from those tires does add up.
More recent tractors specs use the European gross HP numbers for the flywheel and net for pto and drawbar. Thus increasing the "spread".

centash · May 9, 2016

Probably takes 50 hp just to roll it in the field. Ben

markct · May 9, 2016

It isn't necessarily lost it's simply that the pto drive isn't designed for it. It may have hundreds of hp for pulling yet pto stuff doesn't need it

The Dukester · May 9, 2016

I've noticed it seems to take a lot more of their power to climb hills in comparison to smaller row crop type tractors. A big "wiggle middle" will pull a much larger implement on flat ground than it will in hilly ground, or at least "make the rounds" faster because it isn't slowing down pulling hills. Boy, it sure seems like they wallow through or over the wet spots better though.....

RandyB(MI) · May 9, 2016

Look at the hp those ole heavy steam tractors lost. Sometimes they were identified by those numbers like 15-30 or the like. Some lost 50 %.Thats why they were used for belt work more than field work.

buickanddeere · May 9, 2016

The split ratings on steam traction engines was boiler HP and engine HP.

Donald Lehman · May 9, 2016

Yeah, and these tractors all weigh 40,000 to 50,000, too. It certainly does take some HP to move them around.

old-9 · May 9, 2016

They still draw a croud when they pull!
steam pulling

GreenEnvy · May 9, 2016

You are joking right?

GreenEnvy · May 9, 2016

Do you have some examples? Can you compare them to a 2 wheel drive tractor because I can't find any engine hp numbers for 2 wheel drive tractors. Just PTO and drawbar numbers. Off the top of my head my Versatile D145 originally had 180 engine hp and a 145 drawbar hp. Compare that to

T in NE · May 9, 2016

The Magnums lose 50 horse to the hydraulics.

buickanddeere · May 10, 2016

(quoted from post at 00:24:20 05/10/16) The Magnums lose 50 horse to the hydraulics.

Could not be loosing 50HP to hydraulics . The oil cooler is too small to disipate that much thermal energy.

sotxbill · May 10, 2016

(quoted from post at 09:22:13 05/10/16)

(quoted from post at 00:24:20 05/10/16) The Magnums lose 50 horse to the hydraulics.

Click to expand...

Could not be loosing 50HP to hydraulics . The oil cooler is too small to disipate that much thermal energy.

Would all the flow resistance create heat?? As the fluid flow is using some energy so some of the hp is flowing, even through the safety valve. How big of an radiator does a 50 hp engine need?

guido · May 10, 2016

Hello sotxbill,

If I recall correctly about 3 square in" per H.P.

Guido.

T in NE · May 10, 2016

Mostly hydraulics. 8950 is rated 285 flywheel about
235 pto.

Traction is also a factor in draw bar horsepower. If
you don't have an articulated tractor properly
ballasted, it won't pull much better than a row-crop
tractor. Just having a dozer blade hung off the
front of a 9250 makes a huge difference. Only time
the front tires dig is when the rear tires are
spinning without ballast. You can see the front
tires skid when turning.

But you can't hang a ton of weights on the nose of a
16 ton tractor, that's pulling a cart with 30-35
tons of grain in it, due to increased compaction.
According to my old boss. But don't tell him it's
wore out another rear drive shaft slip joint!!!

HP loss

Donald Lehman

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gene bender

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buickanddeere

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centash

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markct

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The Dukester

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RandyB(MI)

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buickanddeere

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Donald Lehman

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old-9

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GreenEnvy

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GreenEnvy

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T in NE

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buickanddeere

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sotxbill

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guido

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T in NE

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