The initial design development for the PowerTech V6 and V8 engine family was done by American Motors Corporation (AMC) and debuted in 1998 with credit to Chrysler. This was the first new V8 engine for Chrysler since the 1960s.[2] The companion V6 was basically the V8 with two fewer cylinders, another concept that originated at AMC before the company joined Chrysler.[3] These new engines had nothing in common with the Chrysler A engineV8s, nor the Jeep 4.0 L "PowerTech" I6 engine.
A 4.7 L V8 came first, available in the Jeep Grand Cherokee, and a 3.7 L V6 version debuted in 2002 for the Jeep Liberty. The PowerTech V6 and V8 were direct replacements for Chrysler's Magnum series in the early 2000s, and were also used in the Dodge Ram and started in the 2000 Dodge Durango. They were not used in any cars, but were reserved for truck and SUV use. They are also known as Next Generation Magnum in Dodge applications.
The PowerTech V6 and V8 engines were produced at the Mack Avenue Engine Complex in Detroit, Michigan. E85 compatible versions of some PowerTech engines were developed and used in numerous Chrysler vehicles. On April 9, 2013, the last 4.7 L engine was built; ending 15 years of production with over 3 million units built.[1]
4.7
The 4.7-liter version was the first of this family, appearing in the 1999 Jeep Grand Cherokee. The displacement is 4.7 L; 286.7 cu in (4,698 cc) with a bore and a stroke of 3.66 in × 3.405 in (93.0 mm × 86.5 mm). It has a cast iron block and aluminum heads with two valves per cylinder. It uses chain-driven Single overhead camshafts, one in each head. It originally produced 235 hp (175 kW) and 295 lb⋅ft (400 N⋅m) of torque. The 4.7 L V8 is available with four speed and five speed automatic transmissions and a 5 speed manual transmission.
A "High-Output" version of the 4.7 L PowerTech engine, producing 265 hp (198 kW) and 330 lb⋅ft (447 N⋅m) of torque, was introduced in 2002, first appearing in the Jeep Grand Cherokee Limited as an option and in the Jeep Grand Cherokee Overland as standard equipment.
This engine was discontinued after the 2008 model year, though the non high output 4.7L V8 engine continued to be available in all vehicles.
The 2008 Dodge Dakota and Ram pickup trucks, Dodge Durango and Chrysler Aspen SUV's, Jeep Grand Cherokee, and Jeep Commander came with a Corsair version of the FFV 4.7 L engine, with dual spark plugs per cylinder, a new slant / squish combustion system design, and 9.8:1 compression, raising power to 290–310 hp (216–231 kW) and 320–334 lb⋅ft (434–453 N⋅m) of torque.
The 2008 4.7 also features other upgrades including a more aggressive camshaft profile, a 74 mm (2.91 in) throttle body, and an improved intake manifold with shorter runners. See Allpar's page on the latest 4.7 L.
The EKG is a 3.7 L V6 version built in Detroit, Michigan. It displaces 3.7 L; 225.8 cu in (3,701 cc).[4] The bore and stroke measure 3.66 in × 3.57 in (93.0 mm × 90.7 mm). It is a 90° V engine like the V8, with SOHC 2-valve heads. It utilizes a counter-rotating balance shaft mounted between the cylinder banks to deal with vibration problems of the 90-degree V6 design, as well as use a 30-degree split pin crankshaft to fire the cylinders every 120 degrees. Output is 210 hp (157 kW) at 5200 rpm with 235 lb⋅ft (319 N⋅m) of torque at 4000 rpm.[4] It has a cast iron engine block and aluminum SOHC cylinder heads. It uses Sequential fuel injection, has roller followers, and features fracture-split forged powder metal connecting rods and an assembled reinforced plastic intake manifold.
The Chrysler 3.7 PowerTech engine used in the 2007 - 2012 Jeep Liberty KK used a wasted spark ignition system that uses one ignition coil to fire two cylinders.
