Kubota D950 Engine Specs Question

[GrassLakeRon]

So my owners manual says: 19hp.....

Then I read this: "The D950 diesel engine produced 21.8 PS (16.0 kW; 21.5 HP) at 3,000 rpm of gross (intermittent) horsepower and 55.6 N·m (5.7 kg·m, 41 ft·lb) at 1,800 rpm of torque."

So 19hp all the time and every once and a while 21.5hp? Or is it the difference between Gross and Net HP? So I am only loosing 2 hp though the hydro unit?

 

[GreensvilleJay]

Someone will know and I bet the meanings have changed over the decades but...
'gross' HP used to mean actual engine HP WITHOUT an alternator or generator on it, no power steering pump and no clutch/ torque covertor , maybe not even the water pump/fan combo.
'net' would be for what we see as a complete engine with water pump, alternator,etc. something you could add battery, fuel and spin a pulley with.....

 

[D2Cat]

Basically, gross is what the engine produces and net is what you get to actually use. The difference is used in the gears, fluids, etc in transporting the power.

 

[GrassLakeRon]

What is intermittent in this context?

 

[North Idaho Wolfman]

What is intermittent in this context?

The engine will not maintain the 3000RPM and 21.8 HP for a length of time, like trying to run a generator for a sustained time.

The HP difference when equipped in a tractor is the loss from the hydraulic system while in an idle state.

 

[GrassLakeRon]

The engine will not maintain the 300RPM and 21.8 HP for a length of time, like trying to run a generator for a sustained time.

The HP difference when equipped in a tractor is the loss from the hydraulic system while in an idle state.

That clears up things.

 

[GeoHorn]

HP ratings/claims can be very misleading and is often misconstrued by marketers to promote their products erroneously.

I have a twin-cylinder 60-gallon shop air compressor driven by an electric motor which claims 6 HP. But the dataplate on the motor points out that is actually rated at 240 volts and 13 amps at 1750 RPM.. This actually equates to around 3 HP. When I contacted Campbell Hausfeld about it they admitted they used an obscure, defunct formula to market that machine.

I’ve seen the exact same engine installed in several machines with large variances in claimed HP…. the difference usually being the RPM at which the claim is made (120 hp at 2300 RPM, 145 hp at 2700 RPM and 175 hp at 3450 RPM… depends largely on the intended use and operating speed.

 

[GreensvilleJay]

Sadly HP 'specs' have follows audio WATT specs. The makers of equipment can use whatever 'numbers' they please and the guv does nothing.
It is possible for the same engine to have different 'specs' when installed in different machines. They are probably 'tuned' for that machines needed RPM vs torque requirements

 

[TheOldHokie]

Sadly HP 'specs' have follows audio WATT specs. The makers of equipment can use whatever 'numbers' they please and the guv does nothing.
It is possible for the same engine to have different 'specs' when installed in different machines. They are probably 'tuned' for that machines needed RPM vs torque requirements

For automotive engines SAE has a standard and a certifcation process. Certification is a third party verification process but its voluntary and not all OEMs choose to use it.

Dan

 

[GeoHorn]

Sadly HP 'specs' have follows audio WATT specs. The makers of equipment can use whatever 'numbers' they please and the guv does nothing.
It is possible for the same engine to have different 'specs' when installed in different machines. They are probably 'tuned' for that machines needed RPM vs torque requirements

The “guv” has no authority to over-see advertising claims as long as they don’t lie blatantly…. Any claims that refer to a “standard” (which you have little or no ability to confirm) gets-by.

Example: The wild advertising claims on television…especially lawyer-ads…which simultaneously scroll a “crawler” across the lower screen SO TINY and SO COMPLICATED…and with such LIMITED viewing time… should be outlawed. There’s NO WAY those disclaimers can be read with the Naked Eye and NO WAY in the timeframe allowed.

 

[GreensvilleJay]

yeah, I 'love' those discalaimers...should be a law that says they have to be a minimum size and on long enough for normal folks to read. Also 'HATE" the station ID icons in the lower right AND that if a US program is on both US and CDN cable channels, the provider tosses the CDN version on the US channel. THAT allows for 6 minutes of commercials per 1/2 hr 1 minute more than the US limit.....

as for lieing... I've got the guv going after a car dealership for posting an ad, on the Internet, with a vehicle they do NOT have in inventory, as 'for sale'. In the old days that was called 'bait and switch'.

audio power USED to be measured in RMS (was industry standard for decades......),using 1KHz sinewave. Over the years it's been 'modified' and just absurd that anyone can get 200watts of power from a USB port that is limited to 5 volts x 2 amps. AKA TEN watts of power.....