Rumored 7.2L

[crash68]

If the 7.2L Cummins in the Ram is going to happen, this will the starting point for the engine:

Cummins Unveils B7.2 Diesel Engine for Medium-duty Applications

investor.cummins.com

The Chassis Cab trucks will probably get the closest version of this engine, but the 2500/3500 definitely have modified programming along with external component layout differently.

 

[CanuckRam1313]

Great specs on it!

 

[Docwagon1776]

Additionally, the new engine will be automatic engine shutdown and stop-start capable

Ick.

 

[Lsujker]

stop-start on a 7.2 diesel.... I don't see why not.

 

[nlambert182]

I've mentioned this engine in a few random posts on here.

I saw a version of it in person back ~2009 when Cummins was hauling engines around to show off to the heavy truck corporations. At the time they were considering it to one up the 6.4 Powerstroke and give a slightly larger option than the 6.7 Cummins. The "rumor" back then was that it would be introduced in 2012. 450+ HP and 900+ torque. At the time, the 6.7 HO was putting out 350 HP/800 torque. I'm surprised they're still talking about it. It's only 16 years in the making.

 

[Docwagon1776]

stop-start on a 7.2 diesel.... I don't see why not.

I wonder if that's better or worse than a gas motor with stop start. These days a gas motor with stop start remembers where the pistons are and fires the correct cylinders to help get it moving along with mild hybrid assist vs just relying on the starter system. Maybe I'm missing something, but would that work very well with compression ignition? Is this going to be paired with something like eTorque for the mild hybrid assist?

 

[HEMIMANN]

I wonder who the target customer is? Pretty sure they wouldn't do this if not for a medium duty fleet customer target like International does.

 

[06 Dodge]

About the only thing I read that I like is they claim it will have a compression release engine brake, my hope is that as good as the Jacobs break aka Jake break...

 

[nlambert182]

I wonder who the target customer is? Pretty sure they wouldn't do this if not for a medium duty fleet customer target like International does.

Way back when... the target customers were the medium duty trucks. For example, the International 4700 and the Freightliner M2 106. We joked around a bit about sticking it in an F350-F550 to replace the failing Powerstrokes. At the time, the 4700s were phasing out the VT365 (6.0 PS) in favor of the Maxxforce 7 (6.4L PS) the same as the F250/F350. I think they delayed it because at the time there wasn't a market for it. International thought they had their problem solved with the Maxxforce line, Freightliner had the 6.7 ISB Cummins and for those who needed more power, the 9-liter ISL were well favored and worked great. The cabover Isuzu trucks were doing fine with the 6.6L Duramax. There really wasn't a good place to insert it.

It's a much bigger engine in physical size than the 6.7 so doubtful that it would fit in a pickup without enlarging the engine bay. Perfect for a medium duty truck.

 

[HEMIMANN]

Yes, but Ram sales volumes are too low to justify a new engine development, is my point. International used to own the medium duty truck market.
Chevy restarted their Kodiak line with Isuzu Dueamax only, no more 8.1 big block gas. Freightliner has medium duty, don't know with what engines.

 

[tjfdesmo]

Freightliner M2 106" BBC offers Cummins ISB or L9 360 and Detroit DD8 375(?) power. Last I read, the Detroit DD8 is being discontinued, in favor of the ISB. On the 112" BBC you can get the Cummins L9 450 or the DD13 525, as it has a taller hood with room for more cooling capacity.

The GM mediums are built by Cornbinder, like the previous generation Ferd mediums were. Isuzu is no longer involved with Duramax.

Isuzu announced they will be using the ISB now. I imagine they might also offer the Octane gasoline version, as well.

Mack uses the ISB exclusively in the MD Mediums.

Paccar uses the ISB re-labeled as their own. They also offer the ZF Powerline, re-labeled as their TX8, which is what Ram is now using in the 2500-5500.

 

[HEMIMANN]

Wow - Cummins hitting the ball outta the park! They were one of the 1st to decide Tier IV by advancing injection timing back to original to get max fuel economy and power then dealing with the resultant high temp NOx exhaust with SCR. CAT followed suit, Navistar decided to stay in-cylinder combustion solution only and failed badly.

I was hoping price and reliabilty of Tier IV exhaust might eventually be good enough for diesels to thrive again.

I mean, the days of rolling coal charcoal grill exhaust did have to come to an end due to how popular diesels became, it remains the most efficient ICE engine there is. We need more of them and less goofy gassers with turbo GDI. Volkswagen scandal set it back decades.

 

[tjfdesmo]

When the 6.7 first rolled out, the Dodge 4500/5500 had SCR, but they went all in-cylinder, heavy EGR, on the pickups. That was quite a black eye, with incessant re-flashes, and big time fuel dilution issues, etc. They finally went to DEF/SCR in 2013, like they should have from the start.

 

[Lsujker]

I wonder if that's better or worse than a gas motor with stop start. These days a gas motor with stop start remembers where the pistons are and fires the correct cylinders to help get it moving along with mild hybrid assist vs just relying on the starter system. Maybe I'm missing something, but would that work very well with compression ignition? Is this going to be paired with something like eTorque for the mild hybrid assist?

Not concerned with hurting the motor. My problem is just more stuff. That’s what eventually breaks. Already over complex.

 

[Kabitz]

Yes, but Ram sales volumes are too low to justify a new engine development, is my point. International used to own the medium duty truck market.
Chevy restarted their Kodiak line with Isuzu Dueamax only, no more 8.1 big block gas. Freightliner has medium duty, don't know with what engines.

THIS.

 

[nlambert182]

Ram has zilch to do with the engine development. This is 100% Cummins. These engines are found across almost every platform.

 

[HEMIMANN]

Ram has zilch to do with the engine development. This is 100% Cummins. These engines are found across almost every platform.

I'm not being clear, then - WHO IS THIS ENGINE FOR?

 

[crash68]

I'm not being clear, then - WHO IS THIS ENGINE FOR?

As I mentioned in the first post, the Chassis Cab trucks will probably get the closest version of this engine. Ram will give Cummins the specs and layout that they want for their trucks. Usually the Ram 2500/3500 truck have a hoped up tune that increases HP/torque numbers but also lowers the B10 rating.
Cummins will tailor the engine for any of the manufacturers that want to offer this engine platform in their trucks. The B series engine from Cummins is a true medium duty truck engine (a Ram 3500 is considered a light duty truck).

 

[NotSoFast]

Europe has lots of smaller diesels (think Volvos) and they all shut off at stops and start right back up. It's a proven technology and why not save where you can. I don't need to waste money on fuel...

 

[nlambert182]

I'm not being clear, then - WHO IS THIS ENGINE FOR?

Well, more than likely medium duty trucks, a lot of Class A diesel pushers, buses, and then if Ram wants it, it could go in those trucks as well.

Right now you can find the B6.7, the L9, the X12, and X15 in motorhomes. The L9 is really common in medium duty trucks, garbage trucks (and similar) and transit buses to name a few.

The L9 is OLD... like 30 years old. It could absolutely replace that platform. It is rumored to make roughly the same HP/TQ numbers as the L9.