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Open Roads Forum  >  Tow Vehicles

 > 2021 Cummins 1075 lbft peak torque at 1356 rpm

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4x4ord

Alberta

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Posted: 12/30/20 07:58am Link  |  Quote  |  Print  |  Notify Moderator

RoyJ wrote:



Your point is valid IF hp was unchanged. With 430 hp, the torque at every given rpm will be higher compared to the 2020 model.


I wouldn’t be at all surprised to see the torque of the 2021 model at 1800 rpm at 1000 lbft the same as the 2020 model was. Often the torque curves follow a pretty straight line from peak torque rpm to peak hp rpm. So if the peak hp of 430 is still at 2800 rpm it will produce about 807 lbft of torque at 2800. On average the engine is gaining 18.6 lbft of torque per every 100 rpm that it drops from 2800. In other words it would seem reasonable to expect a torque rise of about 150 lbft (8 x 18.6) or about 957 lbft at 1800 rpm. So I’d be surprised to see it much higher than the 2020 model. This is what I’m really getting at is that I think this 2021 torque rating is more of a thing to gain boasting rights than to actually bring a more powerful engine into the game.


2017 F350 SRW Platinum short box 4x4.
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rhagfo

Portland, OR

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Posted: 12/30/20 08:20am Link  |  Quote  |  Print  |  Notify Moderator

I would love to see the power graph for 2021, Cummins has a pretty flat torque curve.


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4x4ord

Alberta

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Posted: 12/30/20 08:37am Link  |  Quote  |  Print  |  Notify Moderator

Cummins12V98 wrote:

4x4ord what's your next truck now???


I’m still waiting for the 2021 F350 I ordered to come in. Ram has sharpened their pencil a whole bunch from when I first talked with them but still not enough. I would appreciate things about the Ram interior and I’d like the air ride suspension of the Ram, the CP3 pump is something but not actually that big of deal to me. On the Ford side I expect the Ford might do a little better on fuel and the 10 speed transmission will be nice. As well when I look at what people are asking for 2017 Rams vs 2017 Fords in my area it appears that the Rams depreciate at a little higher rate here. I’m thinking that might be due to slightly used Ford and GM trucks being shipped into the US. Ram on the other hand won’t warranty their trucks once imported from Canada.

4x4ord

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Posted: 12/30/20 09:11am Link  |  Quote  |  Print  |  Notify Moderator

rhagfo wrote:

I would love to see the power graph for 2021, Cummins has a pretty flat torque curve.


I think you mean flat power curve? The HO Cummins for 2019/20 has a very flat power curve. The torque curve on the other hand was not flat. It rises from 750 lbft (400 HP) at 2800 rpm to 1000 lbft (342 HP) at 1800 rpm.

For 2021 the torque rises from 807 lbft (430 hp) @ 2800 to 1075 lbft (277 HP) at 1356 rpm. So the power curve for 2021 is still much flatter than the Duramax, a little flatter than the Powerstroke, but not flat like the outgoing Cummins.

4x4ord

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Posted: 12/30/20 09:25am Link  |  Quote  |  Print  |  Notify Moderator

valhalla360 wrote:

Technologically...sort of...I mean semi engines have been able to beat that for many years.

In practical terms, once you can drag a 20k lb trailer up a steep grade without losing any speed or the engine struggling...it becomes mostly about who bought the bigger codpiece.


Our trucks still can't tow a 20k trailer up a steep grade at 65 mph. I can pull my 16k trailer up a 7% grade at about 50 mph with my 2017 Powerstroke.

* This post was edited 12/30/20 09:34am by 4x4ord *

Grit dog

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Posted: 12/30/20 01:51pm Link  |  Quote  |  Print  |  Notify Moderator

4x4ord, man I understand the long winters up there, but OMG, it’s time to put the Ram microscope hobby on the back burner.
I think you’ve even worn out Shiner with all this!


"Yes Sir, Oct 10 1888, Those poor school children froze to death in their tracks. They did not even find them until Spring. Especially hard hit were the ones who had to trek uphill to school both ways, with no shoes." -Bert A.

RoyJ

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Posted: 12/30/20 02:37pm Link  |  Quote  |  Print  |  Notify Moderator

4x4ord wrote:

RoyJ wrote:



Your point is valid IF hp was unchanged. With 430 hp, the torque at every given rpm will be higher compared to the 2020 model.


I wouldn’t be at all surprised to see the torque of the 2021 model at 1800 rpm at 1000 lbft the same as the 2020 model was. Often the torque curves follow a pretty straight line from peak torque rpm to peak hp rpm. So if the peak hp of 430 is still at 2800 rpm it will produce about 807 lbft of torque at 2800. On average the engine is gaining 18.6 lbft of torque per every 100 rpm that it drops from 2800. In other words it would seem reasonable to expect a torque rise of about 150 lbft (8 x 18.6) or about 957 lbft at 1800 rpm. So I’d be surprised to see it much higher than the 2020 model. This is what I’m really getting at is that I think this 2021 torque rating is more of a thing to gain boasting rights than to actually bring a more powerful engine into the game.


Let's look at it this way: 30hp on a 400hp engine is a 7.5% power increase, and so is 75 lb-ft on a 1000 lb-ft engine. I bet it was no coincidence; Cummins / Ram wanted a 7.5% increase overall. So I don't think think they cheated by simply shifting torque lower without gaining torque up top.

If we assume 2800 rpm peak power as you mentioned, then mathematically, at any given rpm the new engine has 7.5% higher torque and hp.

The engine simply extends the torque rise below 1800. I see it as a win-win. If they kept power at 400hp, then you're absolutely right in it being a marketing move.

theoldwizard1

SE MI

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Posted: 12/30/20 04:06pm Link  |  Quote  |  Print  |  Notify Moderator

4x4ord wrote:

Apparently the 2021 Cummins makes its peak torque of 1075 lbft at 1356 rpm. Are you still impressed?

YES !

But I don't need it and it costs a lot of money !

4x4ord

Alberta

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Posted: 12/30/20 05:08pm Link  |  Quote  |  Print  |  Notify Moderator

RoyJ wrote:

4x4ord wrote:

RoyJ wrote:



Your point is valid IF hp was unchanged. With 430 hp, the torque at every given rpm will be higher compared to the 2020 model.


I wouldn’t be at all surprised to see the torque of the 2021 model at 1800 rpm at 1000 lbft the same as the 2020 model was. Often the torque curves follow a pretty straight line from peak torque rpm to peak hp rpm. So if the peak hp of 430 is still at 2800 rpm it will produce about 807 lbft of torque at 2800. On average the engine is gaining 18.6 lbft of torque per every 100 rpm that it drops from 2800. In other words it would seem reasonable to expect a torque rise of about 150 lbft (8 x 18.6) or about 957 lbft at 1800 rpm. So I’d be surprised to see it much higher than the 2020 model. This is what I’m really getting at is that I think this 2021 torque rating is more of a thing to gain boasting rights than to actually bring a more powerful engine into the game.


Let's look at it this way: 30hp on a 400hp engine is a 7.5% power increase, and so is 75 lb-ft on a 1000 lb-ft engine. I bet it was no coincidence; Cummins / Ram wanted a 7.5% increase overall. So I don't think think they cheated by simply shifting torque lower without gaining torque up top.

If we assume 2800 rpm peak power as you mentioned, then mathematically, at any given rpm the new engine has 7.5% higher torque and hp.

The engine simply extends the torque rise below 1800. I see it as a win-win. If they kept power at 400hp, then you're absolutely right in it being a marketing move.


Your thinking the torque is 1075 lbft from 1356 to 1800 rpm, then drops to 807 lbft by the time the engine hits 2800 rpm .... maybe, I hope your right but I'm not convinced. I wish they would publish torque curves.

spoon059

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Posted: 12/30/20 05:45pm Link  |  Quote  |  Print  |  Notify Moderator

4x4ord wrote:

Your thinking the torque is 1075 lbft from 1356 to 1800 rpm, then drops to 807 lbft by the time the engine hits 2800 rpm .... maybe, I hope your right but I'm not convinced. I wish they would publish torque curves.

Dude, are you trying to become the new fish? Why do you wish they would publish a torque curve? You aren't buying anything but a Ford, your screen name says so. Why do you constantly create and post in Ram threads? Are you that bored?


2015 Ram CTD
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