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2019 Jeep Wrangler: Engines, Gasoline and Diesel

Part 9 of a series. Written in December 2014. Updated October 2017.

wrangler-overview.jpg


Bob Sheaves, who was responsible for 4x4 suspension design at the Jeep/Truck Engineering's PreProgram Engineering Department from the AMC days until 1993, wrote:

Lets take performance requirements first. Just what does Wrangler have to do?

To answer this you need to refer back to an SAE spec called J688 (superceded by J2188, but the 688 spec is easier to understand).

J688 predicts vehicle performance in highway speeds, fuel consumption, drag, and other variables. GM Truck and Bus division used to have a publicly available guide that showed how to specify what equipment to choose so it would meet the customer's needs.
Chrysler's most likely options

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Currently, the rumor mill has two engines front and center:



  • Clarification: Bob Sheaves contributed ideas to this section, but did not write it.

    The Pentastar V6. Confirmed. While Sergio Marchionne has said that the 3.6 V6 would not be used, it now seems that it will, indeed, be the one (versus the smaller 3.2 liter engine). The efficiency of the 3.6 has been increased, which helps.
  • The Hurricane Four. Confirmed. This is a turbocharged four cylinder under development for some time now. Details about this engine are sparse, but it is a completely new effort in the new "GME" series - truly jointly developed, with aspects of the old Neon engine, the TigerSharks, and Fiat designs. FCA documentation pegged this at 368 hp, but that seems to be a mistake.

diesel-28-jeep.jpg


  • A diesel will continue for European sale, though it will switch to an FPT four-cylinder rather than the VM.
    • The 3.0 V6 used in the Ram and Grand Cherokee would be costly, and hard to produce in sufficient quantity given VM's existing constraints; but using it would mean less inventory, no need for new dealer training, and far fewer part numbers in the system. This is the engine Jeep decided on.
    • diesel-RA428.jpg
      GM makes a VM-based 2.8 liter diesel engine and VM itself has a redesign in store. Jeep Wranglers have long used these VM diesels in Europe; the new design should push out over 200 horsepower, with more torque than the current V6.
      The engine has a new cooled EGR system, new manifolds, and a new block and balance shafts. It should be possible to make it meet U.S. emissions, as GM's version does.
    • VM was creating a new L424 engine, another four-cylinder of 2.4 liters, which according to Alessandro Bettini's dissertation was destined for the European Wrangler in 2013 (it seems to be late). This engine was to have a peak 200 horsepower, similar to GM's version of the new 2.8, with 368 lb-ft of torque at 1600 rpm (almost identical to the VM 2.8!). The current 3.6 pushes out 260 lb-ft - the 3.2, 239 lb-ft. The injection system is only a little lower-pressure than the V6; it has solenoid-based direct injection, and EGR with high and low pressures, to reduce emissions to US ULEV standards.
    • There were also rumors of a new Fiat Powertrain diesel in the F1A family, but this is most likely due for the Ducato and ProMaster. The F1 family is probably too rough for civilian buyers. (Ivan Barišić wrote that the 2.3 F1A and 3.0 F1C are Fiat Commercial engines, built in Foggia.)
    • More likely is a Alfa Romeo 2.2 liter diesel which actually shows up in Chrysler's parts system, associated with the Chrysler 200, according to Larry Vellequette of Automotive News. This is used in the European Jeep Cherokee, without the "Alfa Romeo" name. We believe this is the engine they chose.
DIESELSFiat L424VM 2.8 Gas. V6Alfa 2.2 diesel
Horsepower200197~ 292178
Torque (lb-ft)368368260332
  • A straight-six gasoline engine, perhaps based on the four-cylinders or perhaps on the Pentastar Six. This is unlikely for numerous reasons, including timing. However, the GME corporate engine family is modular and could spawn a small straight six for use by different brands, according to Ivan Barišić.

Using the eight-speed automatic should allow diesels to be more practical, despite their relatively low horsepower and power range. It also makes turbocharged four-cylinders less of a burden, thanks to the combination of a lower first gear and a higher top gear. The second-generation eight-speed 850RE has been confirmed for gasoline engines, with diesels getting a ZF-built eight-speed.

torson-AWD.jpg


Engineers would probably prefer to stick with just four-cylinders, to allow more room for suspension articulation and easy packaging, but customers are likely to demand a six even if the four-cylinder can produce more horsepower and torque. That said, perhaps in 2030, buyers will see a four-cylinder diesel and four-cylinder supercharged choice, with an even more capable suspension.



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