Diesel torque ratings.....???

[RMAL]

Just wondering why there not listed .There is a spec for ...just about any thing but no torque ratings?The Cummins/Powerstroke/Duramax boys are all into torque numbers.
I would think a 3 or 4 cylinder inline makes some nice torque in our compact tractors,compared to gas?
Al

 

[v8dave]

You can find torque and HP curves usually on the manufacturer's site. Not under tractors though, go to the industial engines section. I've found Kubota's ratings there. Also, do a Google search, I've actually found more info on small diesel engines on suppliers' pages than manufacturers' pages.

Dave

 

[Hypernix]

Yeah that would interresting. When I first got my CUT, one of my uncle ask me how much HP the new tractor had, I said 21hp. He said that's not possible! I have 25hp in my Craftsman (Sears) lawn tractor. I didn't know what to tell him, but somehow it didn't seem like he was comparing apple to apple but more like kiwi to grapefruit! /forums/images/graemlins/ooo.gif

Hypernix

 

[v8dave]

I did a little digging for some engine rating curves.

Here is Kubota's industrial engine page. Kubota Engines Click on the engine power rating for the curves.

Kioti's engines, click on the model number for curves. Kioti Engines


John Deere Engines Click on the model series, then click an engine, then click an engine number in the left side cloumn, then click on "Quick Specs". THEN, get the PDF full specs version---whew! Not an intuitive process but you'll eventually get the power/torque curves.

I couldn't find an Iseki Engines page for the Massey Ferguson tractors. I don't remember who makes New Holland/Case-IH/Fiat engines. The stuff above will cover a lot of other tractors though.

Dave

 

[timb]

If you want, you can calculate the torque at the peak HP rating (assuming it's accurate) very easily yourself. It's a simple fomula -

Torque = ( hp * 5252 ) / rpm

where hp is the peak horsepower at the 'rated' rpm.

Example - a JD 4710 is rated by Deere at 48.1 hp at 2600 rpm - so the torque at that rpm is (48.1 * 5252 ) / 2600 or 97.2 lb-ft.

That isn't going to give you the peak torque, though, which will occur at a lower rpm and be higher. Depending on model, I've seen numbers that range anywere 10% or 11% higher up to slightly over 30% higher than the torque number generated at the peak hp rpm. I don't know of any way to safely predict that from the peak hp + rpm listed. You need the mfgs. spec.

Also - on diesel vs. gas - notice that there is no fuel type component in the formula. Two engines, one diesel and one gas, if they both truely produce the same hp at the same rpm - produce exactly the same torque. It's highly unlikely that those two engines would produce the same hp numbers at ALL rpms, but in theory if they did, they would also produce the same torque at all rpms. No magic about gas, diesel, or any other fuel. Chances are though, in the real world that if the two engines matched in hp at some rpm they would have very different numbers elsewhere in their rpm ranges.

 

[MicroPilot]

Century/Branson Engine specs can be found at Kukje Machinery - Engines. Click the features button for a HP/Torque graph.

An engine model/tractor model cross reference can be determined by consutling this Kukje Machinery - Tractors page.

All these measurements are in metric though.

SI:
Newton meter (Nm)
1 Nm = 0.737 lb-ft

English:
Pound-inch (lb-in)
1 lb-in = 0.113 Nm
Pound-foot (lb-ft)
1 lb-ft = 1.356 Nm

 

[JerryG]

<font color="blue"> I couldn't find an Iseki Engines page for the Massey Ferguson tractors. </font>
If anyone is interested, in these. Let me know, I have them all.

 

[RMAL]

Thank guys.Interesting that hp ratings are universal,but torque ratings are sae or metric.On Kioti website they list torque as KG.M ,how can I convert that to lb ft pounds.I did read the 1 nm =.737 post but do not now how to convert Kg. m to nm.Way back when I was in school ,they did not get into metrics,thanks again guys.
Al

 

[MicroPilot]

One newton (N) of force is enough to accelerate 1 kilogram (kg) of mass at a rate of 1 meter per second per second (m/s2). In fact, this is really how force and mass are defined. A kilogram is the amount of weight at which 1 N of force will accelerate at a rate of 1 m/s2.

Here is a Conversion Site

 

[DK45C_Dave]

I have found, as a rule of thumb, that for gas engines, the torque rating is within 20% , either way, of its horsepower rating. Diesel engines torque ratings are 3 to 4 times their horsepower ratings. There are always exceptions.