I’ve heard many times before that Bosch isn’t the most pleasant to deal with. I would’nt be at all surprised if the changes are minimal rather than substantial.
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Official 2025 Ram HD
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UglyViking
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My understanding and reading, going way back to the release of the cp4 in the Cummins, was that Bosch was working hard on an update to the CP4 but didn’t wanna force the update early only to have a similar fate.
I love the cp3, it’s a super durable pump behind the Cummins, but I’d be lying if I said I wasn’t eager for an update that would improve mileage and power.
Either way, I’m overall pretty unsure about this new Cummins. I’m scared of the new injectors being external since I live in New England, I’m not sure how to feel about glow plugs, and the new intake position is interesting, basically mirroring what they do for semis, but I’m unsure about it as of now. Can’t see it as a downside.
All that said, seems like a lot of top end changes to still be 80% the numbers the power stroke HO is putting down.
I feel like I’m almost religiously attached to Cummins at this point or I’d already have a new f450 sitting in the driveway.
I love the cp3, it’s a super durable pump behind the Cummins, but I’d be lying if I said I wasn’t eager for an update that would improve mileage and power.
Either way, I’m overall pretty unsure about this new Cummins. I’m scared of the new injectors being external since I live in New England, I’m not sure how to feel about glow plugs, and the new intake position is interesting, basically mirroring what they do for semis, but I’m unsure about it as of now. Can’t see it as a downside.
All that said, seems like a lot of top end changes to still be 80% the numbers the power stroke HO is putting down.
I feel like I’m almost religiously attached to Cummins at this point or I’d already have a new f450 sitting in the driveway.
I feel that one, Cummins would drop Bosch if they didn't upgrade to a more stable and dependable pump, and 2, I'm sure that Bosch doesn't want a repeat of the CP4 which cost both Cummins and Bosch lots and lots of $$$
DougB
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CP8… The Ocho
So aside from the diesel changes and CANBUS update, we get different headlights and grilles, a bigger 14” screen, and an option for a passenger screen on some trims. Am I missing anything? Any other changes to expect since we’re not getting a new cab? Same interior, same performance?
oledirteh
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2 things i noticed off the bat, oil fill doesnt go through the ccv cover, and is that the fuel filter housing on the passenger side now? much easier access.
GirchyGirchy
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Is that a problem on other engines with that style of injectors?
GirchyGirchy
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Well, we opened the taps this morning and started building this thing. Here goes nothin'! 
The filter housing you see on the passenger side is the engine oil filter. Cartridge style now. No more spin-on.
The ZF transmission is the big ticket.
Hopefully it’s as good as it’s been made out to be.
oledirteh
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Oh.... nice. i like that.
flan
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If this does not define a new engine I don’t know what does. So many major changes (other than displacement.) and who knows about other internal changes we are not privy to yet. It would be interesting to hear how many test mules over how many miles this has been tested for, etc.
flan
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Shouldn’t be. Diesel engines have had external injectors including Cummins for just about ever. Glow plugs in a V configuration road engine like powerstrokes and duramax have been problematic with corrosion but our injectors are up and out of the way so we won’t have to worry about anything.
gimmie11s
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Well.. there's other reason to be wary of glow plugs. The tips can swell over time making it literally impossible to pull them out and change them when they go bad.
That was an issue GM had long ago with the 6.2 and 6.5.
flan
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Yep that’s a fact. Hopefully we’re past those days with improvement's in material etc.
gimmie11s
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We shall see. Ive owned 6 cummins powered trucks from engine year 1990 to 2021 and none of them (obviously) have ever had glow plugs. Odd that this far into ISB evolution they decide to make that change to go backwards.
I wonder if it's somehow emissions related.
flan
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That was my initial guess. I guess we will have to wait for the tell all to be written on the engineering aspect of it to know for sure.
CTF2019
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This is emission related. Afterglow is a very effective way as maintaining proper combustion in cold weather. And glow plugs in general are more efficient as they sit directly in the combustion chamber next to the injector. So no thermal heat loss.
A grid heater is not as efficient as it’s simply an heat gun far away from the combustion chamber. That in itself can cause uneven heating as well as air is drawn into the cylinders after the grid.
Glow plugs overall are great. As for getting stuck, simply change the plugs every 70-100k miles and make sure the engine is hot before removal. 99% of the time, they won’t be stuck. Might need to ream between changes as well to be sure no soot buildup.
I deal with Mercedes a lot and people have issues cause they leave them in for 300k miles with no antiseize on threads. Between corrosion and soot buildup, you got a disaster.
What I’m interested to see is how the external injectors are secured. If it’s copper washer and a clamp like Mercedes, that will be disappointing. With that design there can be issues with combustion leaking past and causing a buildup called Black Death that will make that injector nearly impossible to remove. It’s not super common but it can happen. I like the Cummins ISB a lot as the injectors are bathed in oil thus it’s not as easy for them to get stuck.
They can’t afford mistakes though, so we will see once they are out.
