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Chrysler 3.6L V6 Pentastar Engine (Design, Issues & Reliability)

Updated: Jan 9

The 3.6L V6 Pentastar is a six-cylinder gasoline engine that produces between 280-305hp and 340-365 nm of torque. It was originally displayed for the 2011 model-year Chrysler, Dodge, and Jeep cars at the New York Auto Show in 2009.

One of Chrysler's most technologically sophisticated engines to date is this modern V6 engine.

Vehicles all around the world, such as the Dodge Challenger, Jeep Cherokee, Jeep Wrangler, and Ram 1500, are powered by this engine. For three years running, the 3.6L Pentastar V6 has been ranked among the best 10 engines available on the US market.


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Chrysler 3.6L V6 Pentastar Engine

Chrysler 3.6L V6 Pentastar Engine Design

The new 3.6 V6 engine has a 38% increase in power over the previous model, consumes 11% less fuel, and is 19 kg (42 lbs) lighter. Additionally, it's 94 mm shorter than the 3.7 V6 and 34 mm shorter than the 3.5 V6.

The engine's cylinder block has a 60-degree V angle between the cylinder banks and is constructed of high-pressure die-cast aluminium.

It features an open-deck construction that conserves material, makes the engine lighter and less expensive to produce. It also includes cast iron cylinder liners that increase engine longevity.

Three piston oil cooler jets are located within the engine block. By controlling heat, each oil jet cools two pistons, preventing detonation and engine knock.

Cast aluminium pistons are used, along with forged steel connecting rods, a nodular iron crankshaft, and pistons with low friction rings and reduced skirt area for less friction and weight.

A chain-driven vane-type variable displacement oil pump is used in the engine.

All brackets for engine accessories were removed. The engine block is connected to the alternator, compressor for the air conditioner, and belt tensioner.

Furthermore, they are driven by a serpentine belt. The level of noise and vibration has been decreased as a result of this design.

Sand-cast aluminium cylinder heads with T7 heat treatment are used in the 3.6L Pentastar engine. The cylinder head is comprised up of dual overhead camshafts with hydraulic lifters and roller finger followers, it has four valves per cylinder.

The intake and exhaust camshafts are driven by a chain (there is a separate timing chain for each head). A "silent chain link" design is used in timing chains.

There are torque-activated phasers on each of the four camshafts. The single-piece, 39 mm diameter intake valve is constructed of forged, heat-resistant (martensitic) steel.

The exhaust valves are made of a forged austenitic head and a martensitic stem. The diameter of the exhaust valve is 30 mm, high-flow intake and exhaust ports, as well as an integrated exhaust manifold, are features of cylinder heads.

On top of the engine is a multi-point port fuel injection system with an electronically controlled lightweight composite intake manifold and 74 mm throttle body.

Between 1800 and 6350 rpm, 90% of the maximum torque is produced. Since high-octane fuel is not required, the engine can deliver great driving performance.

Pentastar engines are very fuel-efficient, produce low emissions, and run smoothly. They also require less maintenance and don't require high-octane fuel.

The Ultra-low Emission Vehicle II and Euro6 standards, as well as Tier 2 BIN 5 emission regulations, are all met by the Pentastar V6 engines.

Additionally, it is built to adhere to the strictest future standards, such as California's LEV III and PZEV.

2016 Pentastar Engines

A new 3.6L V6 engine and an improved Pentastar engine family for the Jeep Grand Cherokee and Dodge Durango were released by FCA in 2016.

The new engine has a two-stage variable valve lift system (VVL). Both low and high valve lifts are possible with the VVL technology.

  • High valve lift activates when power is required.

  • Low valve lift at moderate speeds can reduce fuel consumption (up to 2.7% more than the prior generation).

A cooled exhaust gas recirculation (EGR) system was required by the manufacturer.

The reworked engine also has new valve springs, low-tension piston rings, longer runners, more torque, high-tumble intake apertures inside the cylinder heads, and a new plastic intake manifold.

New eight-hole injectors were installed to the fuel system. The port fuel injection mechanism is still present in the engine.

Recalibration was performed on the variable valve timing (VVT) system. The 10.2:1 compression ratio was increased to an 11.3:1 compression ratio in this engine.

These changes help to boost power and torque output while also reducing emissions and increasing fuel efficiency.

3.6L V6 Pentastar Engine Specs

  • Manufacturer: FCA US LLC - Mack Avenue Engine Complex, Trenton Engine Plant and Saltillo South Engine Plant

  • Production years: 2010-present

  • Cylinder block material: Aluminium

  • Cylinder head material: Aluminium

  • Fuel type: Gasoline

  • Fuel system: Port multi-point fuel injection

  • Configuration: V

  • Number of cylinders: 6

  • Valves per cylinder: 4