Beware of the new Cummins 6.7

CGiron

New Member
Dec 11, 2018
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Let´s guess about the power numbers now. The engines are in production and will be revealed in four weeks. 
 
I think 990 lb/ft of torque and 450 hp in the Ram 2500
 

Green_mtnMan

New Member
Dec 4, 2018
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Do you think 2018 HD truck prices will drop much after January, or only toward the end of the year when 4.5's actually are rolled out en masse?
 

Green_mtnMan

New Member
Dec 4, 2018
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Though I very much want to buy a 2018 diesel dually right now, the potentiality of a x 3-ish MPG bump would be a tremendous boon for me w/ the new engine / 8spd transmission. If it turns out that there is not a significant bump in efficiency, I'll probably just go with a 4.10 2018 Aisin transmission w/ the old 6spd automatic... I'm just looking for a rig that will haul around a 25K trailer with the least amt of diesel, lol...
 
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CGiron

New Member
Dec 11, 2018
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Strange move to exclude the new Cummins with 1000 lb/ft for all but the 3500. Reason?
Are they trying to make the 2500 buyers to move to 3500?
 

Admin

Site admin
Staff member
Nov 16, 2018
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Vancouver, B.C
hdrams.com
Strange move to exclude the new Cummins with 1000 lb/ft for all but the 3500. Reason?
Are they trying to make the 2500 buyers to move to 3500?
I had a feeling that is how it would be. Previously they offered the Cummins in 2 different power levels restricting the HO to the 3500 as well. Honestly I think they should just offer the HO across the board as the only diesel option. The other manufacturers only offer 1 diesel option, both more powerful and with more torque than the standard output Cummins.
 
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DevilDodge

Active Member
Staff member
Nov 21, 2018
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Central Pennsylvania
You have to give something to the Heavy HD guys.

It used to be the transmission. Maybe they can't put the Aisin trans into the 2500 for payload reasons or the such. Just offering a reason. The old system went low out put forthe G56, 800 for the 6speed auto and 850 for the Aisin.

I actually thought the years before the Aisin you got the HO in 2500 and not in the 3500.

Will have to check.
 

1HasBeen

New Member
Jan 20, 2019
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I am pretty happy with the power and torque numbers, but I am very disappointed they went from the reliable CP3 injector pump to the infamous CP4.
 

1HasBeen

New Member
Jan 20, 2019
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What is the CP4 Issue?
Just google CP4 failure and you can read for days. So, the CP3 that Cummins has run since common rail came out in '03 is very reliable, and if it does fail it just quits and you change it out. Ford and GM have been running the CP4, and it does not do well with the ULSD fuel in the US, it is much, much, much more sensitive to fuel quality issues, and due to the basic design, when a CP4 fails it makes shrapnel that ruins the lines, the rails, the injectors, the relief valves, the rail pressure sensors, etc. So basically it ruins the entire fuel system. GM finally got away from it and went to a Denso system. Ford offers a kit to convert to a CP3. What does that tell you??? Now there are rumors of Ford getting away from the CP4, too.

There is talk that it has been internally improved, but I have seen nothong to confirm it. The fact that it says CP4.2 does not mean it is a unit revision. Plus, and most importantly, I have seen nothing that leads me to think it is even possible to prevent it from ruining the rest of the fuel system in the event of a failure.

I wish Ram and/or Cummins would address this directly. They are not fooling anybody. People who have been around these motors are well aware of the CP4's terrible reputation in the industry. They are risking a HUGE black eye in the name of a cheaper component.