4.2 L Cummins diesel

Diggerfreek · **Posted:** Fri Dec 28, 2007 6:57 pm

yeah, 20/25 does seem low. and i bet that you will not be able to chip it do to the dpf filterm system.

Threeweight · **Joined:** Mon May 14, 2007 5:57 pm **Posts:** 679

I imagine the mpg figures are a wild guestimate. You can't know that until you know what transmission, axle ratio, and vehicle it is bolted into. Stick the V6 it in an aerodynamic passenger car with a 6 speed manual and a favorable ratio rear end (or even fwd) and you'd likely see low 30's mpg on the highway. Stick it in a Dakota with a 4 speed auto and a towing rear end and it will be lucky to hit 25.

Frankly, the 4.2 is too much for the Wrangler or Dakota, IMO. A 2.5 or 3.0 liter (or 2.

is more in the correct neighborhood for something of that size and weight. The 4.2 looks to me to be designed for a 1500 series pick up, full size van, or derivatives (panel trucks, full size suvs, etc...) 270 hp and 420 foot pounds of torque is pretty massive output when compared to what vehicles like the Wrangler and Dakota were designed to handle.

dieselenthusiast · **Posted:** Fri Jan 04, 2008 8:28 pm

Threeweight wrote:

I imagine the mpg figures are a wild guestimate. You can't know that until you know what transmission, axle ratio, and vehicle it is bolted into. Stick the V6 it in an aerodynamic passenger car with a 6 speed manual and a favorable ratio rear end (or even fwd) and you'd likely see low 30's mpg on the highway. Stick it in a Dakota with a 4 speed auto and a towing rear end and it will be lucky to hit 25.

Frankly, the 4.2 is too much for the Wrangler or Dakota, IMO. A 2.5 or 3.0 liter (or 2.

is more in the correct neighborhood for something of that size and weight. The 4.2 looks to me to be designed for a 1500 series pick up, full size van, or derivatives (panel trucks, full size suvs, etc...) 270 hp and 420 foot pounds of torque is pretty massive output when compared to what vehicles like the Wrangler and Dakota were designed to handle.

How about the Delta 4.0L V6?
http://www.lostjeeps.com/forum/phpBB3/vie ... 987#284987

Threeweight · **Joined:** Mon May 14, 2007 5:57 pm **Posts:** 679

Power vs. efficiency would be just about perfect from that 4.0 for a mid-size pick up and SUV application. That engine in a Durango would be a Tacoma/Frontier killer (assuming the build quality of the truck could actually compete.

Interesting though that it's hp and torque are virtually identical to the 3.0 used in the Grand Cherokee CRD, yet it is a bigger displacement engine, but the fuel economy is actually superior (I would think the Durango is actually heavier and less aerodynamic than the GC).

I'd still say it is likely physically too big for the Wrangler. A newer version of the 2.8 is used in the Liberty CRD for overseas sales. The 2.8 inline 4 fit just barely fits under the hood of our Liberties. I haven't looked too closely at the engine bay of the Wranger, but if it was designed for an inline 4 or gas V6, a diesel V6 would likely pretty tight.

Threeweight · **Joined:** Mon May 14, 2007 5:57 pm **Posts:** 679

Nevermind. The 4.0 was abandoned. Just posted an article on it, the test was from 1998.

dieselenthusiast · **Posted:** Sat Jan 05, 2008 1:03 pm

Threeweight wrote:

Power vs. efficiency would be just about perfect from that 4.0 for a mid-size pick up and SUV application. That engine in a Durango would be a Tacoma/Frontier killer (assuming the build quality of the truck could actually compete.

Interesting though that it's hp and torque are virtually identical to the 3.0 used in the Grand Cherokee CRD, yet it is a bigger displacement engine, but the fuel economy is actually superior (I would think the Durango is actually heavier and less aerodynamic than the GC).

I'd still say it is likely physically too big for the Wrangler. A newer version of the 2.8 is used in the Liberty CRD for overseas sales. The 2.8 inline 4 fit just barely fits under the hood of our Liberties. I haven't looked too closely at the engine bay of the Wranger, but if it was designed for an inline 4 or gas V6, a diesel V6 would likely pretty tight.

The bad news is that GM bought 50% of VM MOTORI and the new 2.9L/3.0L is going into the base model Cadillac coming out in 2010. Chrysler ditched VM MOTORI and decided to go with the 3.0 Mercedes-Benz diesel as it will be 50 state legal with the bluetech selective catalytic reduction system in place. Here’s a photo of the 3.0 setting in a Wrangler at the SEMA show.

dieselenthusiast · **Posted:** Sat Jan 05, 2008 1:08 pm

Here's a quote from AutoblogGreen "What's going on with the Jeep Wrangler diesel concept vehicle on display in the Mopar booth at the SEMA Show? An early news release said it sports a 4.2-liter V6 diesel engine. The wheelstand sign says 4.2-liter diesel engine. We've heard Cummins say they're building a 4.2-liter diesel for light-duty Daimler/Chrysler applications. But peeking under the hood I find a 3.0-liter common-rail diesel engine. None of the Mopar personnel on duty would talk, just saying that it's a concept vehicle and can't explain the sign. We know that Jeep will offer a 3.0-liter CRD, which is made by Mercedes-Benz, in the 2007 Jeep Grand Cherokee. So it appears that someone at Jeep is having too much fun teasing us about the possibility of Cummins engine in a Wrangler. Judging by the response from our earlier post, maybe Jeep should rethink its concept."

dieselenthusiast · **Posted:** Sat Jan 05, 2008 1:15 pm

KJMedic · **Posted:** Sun Jan 06, 2008 12:08 pm

Cummins already makes a 3.9L 4BT motor that would fit into the Dakota, Wrangler, Liberty KK and works just fine. They are great motors and have awsome torque.

indianrefining · **Posted:** Wed Feb 06, 2008 11:12 am

The latest I'm hearing (FWIW) is that the 5.6 V8 might go into the Commander (if it's still around), the 4.2 V6 into the Grand Cherokee and the Wrangler, and a 2.8 I4 (also from Cummins) into the Liberty (all 2010 or late 2009). :wink:

Threeweight · **Joined:** Mon May 14, 2007 5:57 pm **Posts:** 679

Sweet.

The torque figures on the 4.2 are monstrous... makes the biggest Hemi look like a 98 pound weakling. Heck, I believe that is more power than the 12 valve version of the Cummins 5.9. A Dakota rated to tow 12,000 pounds, anyone?

Given the 2005/2006 Liberty CRD's transmission troubles, I'd be a little nervous about what that monster would do to torque converters. The 3.0 Bluetec in the current Grand Cherokee only develops 370 or so foot pounds.

This may be heresy, but I wonder if Chrysler will be wise enough to pay attention to aerodynamics, weight, and rear-end gearing as it begins to ramp up diesel usage? IMO, the 2.8 in our Liberties should do far better than 27-28 mpg highway, and the Grand Cherokee CRD's fuel economy is a little sad (less than a Sprinter van).

dieselenthusiast · **Posted:** Wed Feb 06, 2008 8:45 pm

I really believe that the diesel market is going to take off. Auto manufactures from all facets are planning for a diesel future. Between the EPA and the consumers, fuel efficiency is a real issue. The solution? DIESEL! New Diesel technology is exploding and the popularity is in huge demand. There is no doubt, that Cummins and Chrysler has teamed up to make some great products. And I will not have a problem buying a Wrangler 4 door Diesel.

Reflex · **Joined:** Mon Jan 29, 2007 8:48 pm **Posts:** 567

The vehicle I want is a Cummins powered Grand Cherokee. Ideally with the 10 year or Lifetime warranties Chrysler is offering. When thats out, I'll upgrade as long as its avialable in the Laredo trim(not going to pay for shiny gadgets I won't ever use).

WV Jay · **Posted:** Wed Feb 06, 2008 10:33 pm

dieselenthusiast wrote:

I will not have a problem buying a Wrangler 4 door Diesel.

Same here!!

dieselenthusiast · **Posted:** Mon Feb 25, 2008 4:00 am

Uffe · **Posted:** Mon Feb 25, 2008 5:19 am

WV Jay wrote:

dieselenthusiast wrote:

I will not have a problem buying a Wrangler 4 door Diesel.

Same here!!

That's what I wanted but money just allowed for my CRD KJ.... hehe

BobFarley · **Posted:** Thu Jan 15, 2009 6:25 pm

Cummins is testing a small four cylinder to put in Dodge 1/2 ton and possibly work out a deal with Toyota. Just a heresay, but I have seen 1/2 ton Dodge with secret test truck camo around town. BobFarley, resident of Columbus, IN Home of Cummins World Headquarters. Also, found out from local Jeep dealers parts guy around 2005 some guy from Cummins was buying parts working on building a prototype of VM Motarii engine. It already exists just a matter of what to put it in.

dieselenthusiast · **Posted:** Thu Jan 15, 2009 6:59 pm

Thanks for the report BobFarley, I hope to see this old thread revive itself. Keep the information coming in. :wink:

CRD Joe · **Posted:** Mon Apr 27, 2009 12:01 am

Seems to me everything in this thread can be considered shelved! Nothings going to happen while the big three are near death.

JeepinJarhead03 · **Posted:** Thu Apr 30, 2009 2:39 am

i love a diesel

i wish they made a jeep that had the same sort of efficiency (but with more power please..) that i had in my lil vw rabbit truck :lol:

friggin thing got over 50mpg, wouldn't go over 65 but would smokeum through 3rd gear and occasionally chirp 4th

of course.. never tried but im sure 2 people coulda picked the truck up and turned it around, kinda reminded me of a diesel ford courier

4.2 L Cummins diesel

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