2016 3.6L Jeep WK2 Grand Cherokee Pentastar Engine Upgrade

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New 2016 3.6L Pentium engine


Press Release – September 1, 2015
Polishing the Pentastar: FCA US Upgrades Celebrated V-6

  • Award-winning engine’s newest iteration contributes to fuel-economy enhancements of greater than six p.c
  • Torque elevated greater than 14.9 p.c at engine speeds beneath 3,000 rpm – the place torque actually counts
  • Two-step variable valve elevate (VVL), which advantages gasoline economic system and Pentastar’s class-leading refinement
  • Cooled exhaust-gas recirculation (EGR) delivers better effectivity and allows knock-free operation at larger, real-world hundreds
  • Upgraded variable-valve timing (VVT) system


    • Other important enhancements:


  • New consumption manifold, longer runners allow torque enhance
  • Increased compression ratio – now 11.3:1
  • High-tumble consumption ports and shrouded combustion chambers
  • Eight-hole gasoline injectors with optimized atomization
  • Multiple friction-reduction options
  • Redesigned elements cut back total engine weight – regardless of added content material
  • More than 4.7 million customer-equivalent check miles collected throughout growth
  • Debuts within the 2016 Jeep Grand Cherokee, the world’s most-awarded SUV


    Additional FCA US powertrain breakthroughs for model-year 2016
  • All engines engineered for U.S. will probably be E15-compatible1
  • Unique FCA US rear-axle disconnect system migrates to 2016Fiat 500X delivering segment-first functionality, effectivity

September 1, 2015 , Auburn Hills, Mich. – Already distinctive amongst V-6 engines for its refinement, energy, effectivity and flexibility, the formidable 3.6-liter Pentastar is remade for model-year 2016.

Depending on the applying, the redesigned V-6 delivers fuel-economy enhancements of greater than six p.c whereas rising torque greater than 14.9 p.c. This happens at engine speeds beneath 3,000 rpm, the place elevated torque has its most profound affect on the driving expertise.

Enhancements equivalent to two-step variable valve elevate (VVL), cooled exhaust-gas recirculation (EGR) and progressive weight-reduction methods enhance the engine’s effectivity and efficiency, all whereas preserving the smoothness that continues to be an indicator of the Pentastar model.

“With greater than 5 million Pentastars on the highway, we’ve clearly struck a chord within the market,” says Bob Lee, FCA North America Vice President – Engine, Powertrain and Electrified Propulsion and Systems Engineering. “Such success brings monumental duty. Accordingly, we centered our efforts on bettering effectivity and offering better buyer satisfaction in a package deal that delivers superior worth.”

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Increased fuel-efficiency was a key impetus within the growth of the redesigned 3.6-liter Pentastar V-6 engine. FCA US LLC powertrain engineers evaluated a number of applied sciences, accumulating greater than 4.7 million customer-equivalent miles utilizing pc simulation and bodily checks.

Improvements had been measured proper all the way down to the element degree. And no enchancment was too small to chase.

Ultimately, the workforce recognized the mixture of options that ship the best advantages within the widest working vary.

Arguably probably the most compelling enhancement is two-step VVL. The system is designed to stay principally in low-lift mode till the client calls for extra energy; then it responds by switching to high-lift mode for improved combustion.

The result’s much less total pumping work, which by itself, accounts for a fuel-economy enchancment of as much as 2.7 p.c, in contrast with the three.6-liter Pentastar’s earlier iteration, named 3 times to the celebrated annual record of Ward’s 10 Best Engines.

The addition of cooled EGR firmly establishes the redesigned Pentastar among the many V-6 elite. In addition to the plain emissions-reduction advantages, the system additional cuts pumping losses and allows knock-free operation at larger, real-world hundreds.

This interprets to a fuel-economy enchancment, by itself, of as much as 0.8 p.c.

Pumping losses are once more focused with the engine’s upgraded Variable Valve Timing (VVT) system. For 2016, it strikes to torque-driven cam-phasing, which reduces oil demand.

The new VVT system additionally will increase its vary of authority to 70 levels, from 50 levels. This helps mitigate knock throughout scorching begins and expands the working envelope of Engine Stop Start (ESS), a fuel-saving function that’s carried over from the previous-generation 3.6-liter Pentastar.

ESS is pushed by a high-speed/high-durability starter that reduces crank time for faster restarts.

The system is regulated by algorithms, which act on the car’s powertrain and chassis elements.

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As a end result, acceleration is at all times aligned with driver inputs. Passive accelerator software is met with measured throttle response; exhausting inputs set off aggressive begins. And there’s no ready for both.

The identical could be mentioned for torque. More torque is delivered extra rapidly by recalibrating the VVT system to leverage the advantages of the brand new consumption manifold’s longer runners.

The result’s a torque enhance of greater than 14.9 p.c, relying on the car software. And this happens between 1,000 and three,000 rpm – engine speeds most prospects see very continuously.

Says Lee: “We are notably happy with this achievement as a result of our engineering philosophy revolves round understanding our prospects and anticipating their wants and desires. The new 3.6-liter Pentastar delivers a driving expertise that’s exhilarating.”


The redesigned 3.6-liter Pentastar V-6 engine advantages from quite a few upgrades which higher harness the combustion occasion. The upshot is improved effectivity.

Most notably, the engine’s compression ratio jumps to 11.3:1 from 10.2:1, in contrast with the engine’s earlier iteration.

High-tumble consumption ports mix with shrouded valves to make the most of the engine’s new gasoline injectors. Featuring eight holes every, twice the quantity within the earlier iteration’s injectors, they provide optimized atomization and concentrating on.

Factor within the impact of 100-millijoule high-energy ignition coils with platinum sparkplugs and the above combustion enhancements account for a 1.5-percent enchancment in gasoline economic system.

Multiple friction-reduction methods contribute to an extra one-percent fuel-economy hike, in contrast with the engine’s earlier iteration.

Particularly notable is the usage of HG-R1 on the timing drive guide-faces. The new Pentastar is the primary manufacturing engine to function this low-friction materials.

Also contributing to friction discount are new valve springs, low-tension piston rings and piston pins which function diamond- like carbon coating.


Just as refinement is a defining trait of the Pentastar V-6 engine household, so is element design. Its built-in exhaust manifold contributes to packaging efficiencies that allow plug-and-play-type integration throughout a formidable vary of auto segments and drivetrain configurations.

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The new 3.6-liter Pentastar debuts on the 2016 Jeep Grand Cherokee, the world’s most-awarded SUV. The new consumption manifold improves airflow, which advantages volumetric effectivity and allows a lift of as much as 295 horsepower, from 290 horsepower.

For model-year 2016, FCA US powertrain engineers had been challenged by the potential unfavourable results of incremental weight wrought by the engine’s new function content material. However, intelligent element redesign produced an engine that weighs as little as 326 kilos, relying on the applying.

That’s 4 kilos lower than the earlier 3.6-liter Pentastar, regardless of the addition of recent content material weighing 13 kilos.

A skinny-wall technique was used to cut back the nominal thickness of sure die-cast elements – with out compromising the noise, vibration and harshness (NVH) traits for which Pentastar engines are identified.

Windage-tray weight was slashed by 19 p.c and front-cover weight was minimize by 5 p.c. Two-piece oil pans had been eradicated, except for Trail Rated automobiles.

The engine’s crankshaft additionally went on a eating regimen. Its major bearings and pins had been trimmed, which contributed to an total block-assembly weight discount of six kilos. This generates extra friction-reduction.

“Our prospects have made clear their profound appreciation for the three.6-liter Pentastar,” Lee says. “We really feel the upgraded Pentastar will evoke equally sturdy feelings.”


Model-year 2016 brings to FCA US showrooms a crossover that provides a drivetrain with functionality no different car in its class can declare. The all-new Fiat 500X options rear-axle disconnect know-how that’s distinctive to the FCA US steady of front-wheel-drive-based automobiles.

It disconnects and reconnects the rear axle – robotically and seamlessly – as wanted and at any pace.

When driving situations warrant solely front-wheel-drive, the rear axle disconnects at each the PTU and rear-drive module, which improves gasoline economic system by lowering the parasitic loss, which happens with standard techniques.

For model-year 2016, FCA US engines – apart from the 8.4-liter V-10 that powers the Dodge SRT Viper – will probably be E15-compatible in anticipation of the gasoline’s proliferation.


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