15 litre cummins - The Combine Forum
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post #1 of 16 (permalink) Old 05-11-2019, 12:44 PM Thread Starter
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15 litre cummins

Running a 2014 versatile 450. What are your thoughts on minimum engine rpm a guy can run before you should drop a gear and idle up. Currently shooting for 5 mph. Can either do it at 1720 rpm or 1920 rpm. Looks to be using about 10 litres more fuel per hour at the higher rpm.

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post #2 of 16 (permalink) Old 05-11-2019, 01:06 PM
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Running a 2014 versatile 450.
Currently shooting for 5 mph.
Can either do it at 1720 rpm or 1920 rpm.
Looks to be using about 10 litres more fuel per hour.
https://tractortestlab.unl.edu/docum...tile%20450.pdf

1720. More power, less fuel, less noise.

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post #3 of 16 (permalink) Old 05-11-2019, 01:24 PM
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https://tractortestlab.unl.edu/docum...tile%20450.pdf

1720. More power, less fuel, less noise.
It will pull better at 1920 then 1720. (I don’t care what Nebraska test says. This is real world in field test) the test doesn’t show the gear he wants to run at the mph he wants.

But if it isn’t lugged down I’d run 1720.

As long as the engine can keep that rpm and you can increase it without much trouble it won’t hurt the engine.

Last edited by meskie; 05-11-2019 at 01:26 PM.
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post #4 of 16 (permalink) Old 05-11-2019, 02:07 PM Thread Starter
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Lots of power at 1720 rpm so sounds like engine will be fine. I guess my only other concern is lube pressure in the transmission. Thought I read on here that the 2 track challengers with transmission problems were possibly related to running too low of engine rpm. I’ve got the ta-19 cat powershift transmission in this one
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post #5 of 16 (permalink) Old 05-11-2019, 02:14 PM
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It will pull better at 1920 then 1720.
Since only 2100 and 1800 were the test rpms hard to say, but you are wrong anyway.
It will NOT pull better at 1920 than 1720, less pull but more rpm cushion at 1920 which is what I think you are confusing.

Wished they still did lugging ability runs but that’s not a European thing so it died, except on request the odd one is tested.

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post #6 of 16 (permalink) Old 05-11-2019, 02:50 PM
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Since only 2100 and 1800 were the test rpms hard to say, but you are wrong anyway.
It will NOT pull better at 1920 than 1720, less pull but more rpm cushion at 1920 which is what I think you are confusing.

Wished they still did lugging ability runs but that’s not a European thing so it died, except on request the odd one is tested.
Have you drove one?

A stock 450 will fall flat on its face under 1700rpm. But it will hold 1900 real easy. If you have your cruise set at 1720 and you pull a hill it will not hold there at all then the transmission will kick you into neutral. It's not just the engine it's how versatile has the transmission calibrated and derated set. At 1900 it will drop to 1850ish and hold there. So I stand by my real world claim of the versatile 450 will pull better at 1920 then 1720.
I have also seen the dyno charts of the 450 and if I wanted max power it would run just over 1850rpm.

The 15L in the versatile sucks for lugging ability compared to the 15L the CNH used in there big 4WD tractors for whatever reason.

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post #7 of 16 (permalink) Old 05-11-2019, 06:59 PM
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Don’t quote me but I think all Nebraska tests are conducted at wide open throttle, the lower RPM data is derived by lugging the engine down to 1800 RPM to provide a sense of how much grunt the engine has.

I’m sure it isn’t always the case, but many electronic throttle programs don’t allow full engine torque output when actually set at partial throttle positions.
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post #8 of 16 (permalink) Old 05-11-2019, 07:42 PM
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I run a 450 versy at 1750rpm all day long. 50ft and 550 tank
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post #9 of 16 (permalink) Old 05-11-2019, 08:59 PM
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Have you drove one?

A stock 450 will fall flat on its face under 1700rpm. But it will hold 1900 real easy. If you have your cruise set at 1720 and you pull a hill it will not hold there at all then the transmission will kick you into neutral. It's not just the engine it's how versatile has the transmission calibrated and derated set. At 1900 it will drop to 1850ish and hold there. So I stand by my real world claim of the versatile 450 will pull better at 1920 then 1720.
I have also seen the dyno charts of the 450 and if I wanted max power it would run just over 1850rpm.

The 15L in the versatile sucks for lugging ability compared to the 15L the CNH used in there big 4WD tractors for whatever reason.
My 550 delta is exactly the same. The 535 quadtrac you can idle right down to 12 or 1300 on the harrows to turn and rev it back up. If you did that in the delta trac you would be eating the steering wheel. Rev it up over 1800 and it probably pulls better than the case.
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post #10 of 16 (permalink) Old 05-11-2019, 10:11 PM
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Running it at 1700rpm will be fine but it won’t be as forgiving if you get into a position where it does start to lug for obvious reasons.
As for the lugging power vs old Case 15L Cummins engines it’s probably more to do do emission systems preventing the engine from making soot from unburnt fuel by lugging than anything else.
When you lug a old tier 2 motor down that black smoke would fail any emissions test.

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