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Chrysler 5.7L 345 HEMI Engine (Design, Issues & Reliability)

Updated: Jan 9

In 2003, Chrysler unveiled the third generation of Hemi engines. A 345 cubic inch, 5.7L V8 gasoline Hemi engine producing 425 hp and 569 nm torque, it was the first engine for the 2003 Dodge Ram pickup trucks.

The 5.9L V8 LA/Magnum engine (code named Eagle) was replaced by the 5.7-liter Hemi engine.

The 345 Hemi engine was offered in a variety of Chrysler vehicles throughout the following few years, including the Dodge Durango, Chrysler 300C, Dodge Magnum R/T, Jeep Grand Cherokee, Dodge Charger, and others.


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Chrysler 5.7L 345 HEMI Engine

Chrysler 5.7L 345 HEMI Engine Design

Similar to the 4.7L PowerTech V8, the 345 Hemi engine has a cast-iron cylinder block with a deep skirt and a 90-degree angle between cylinder banks.

The cast nodular iron crankshaft is supported by four bolts per main bearing. It has powdered metal connecting forged rods and pistons made of lightweight aluminium with a skirt coating.

Pistons used wider rings, measuring 1.50/1.50/3.0 mm, up to 2008. Pistons were given thin piston rings, a 1.20/1.20/2.0 mm ring set, after the 2009 revision.

Between the cylinder banks is the chain-driven camshaft. The camshaft is intentionally elevated to reduce the length of the pushers and reduce inertia, which results in a rather lengthy timing chain.

This engine features aluminium cross-flow cylinder heads with two valves and two spark plugs per cylinder. The HEMI-shaped chambers now have squish shelves and a flatter form on both sides, which boosts efficiency and lowers emissions.

Pushrods and rocker arms are used by the camshaft to operate the intake and exhaust valves. Beehive valve springs and hydraulic lifters in the roller form are also used.

With MDS (Multi-Displacement System), a cylinder deactivation technology, the 5.7 Hemi uses less fuel and emits less pollutants.

With this MDS technology, the intake and exhaust valves are kept closed while the fuel is turned off in four cylinders (two in each bank). This is done by regulating the oil flow through the corresponding valve lifters.

The exhaust valves have a 1.55-inch (39.4 mm) diameter, while the intake valves are 2.00 inches (50.8 mm) in diameter. Plastic is used to make the intake manifold. A drive-by-wire electronic throttle body is also included.

2009 Engine

Chrysler introduced the brand-new 5.7L Hemi engine (Eagle 5.7) in 2009. The engines stability and efficiency have been dramatically improved.

The most significant modification was the addition of three more oil channels and a bigger front cam bearing in the block to accommodate variable valve timing (VVT).

  • The rebuilt engine block has a new, extremely robust crankshaft that is still made of cast iron.

  • To fit the smaller ring pack, new pistons, a dual-mass crankshaft damper, stronger connecting rods, and a new dual-mass crankshaft damper are all included.

Some versions, starting in July 2009, include an electronically controlled, variable length intake runner (the active intake).

The development of the cylinder heads has been significant. The original rectangular intake ports have been replaced with 14% bigger, almost square ones that have a 14% higher airflow.

  • The ceiling is taller above the D-shaped exhaust vents.

  • The intake valves have been extended by two millimetres.

  • The updated heads contain 65cc oval chambers rather than the spherical 85cc chambers with squish shelves seen in the original heads.

  • The compression ratio was raised to 10.5:1.

The 5.7L Hemi engine replaced the 4.7-liter V8 PowerTech engine in 2013 as the default V8 engine.

5.7L HEMI Engine Specs

  • Manufacturer: Chrysler, Saltillo Engine plant in Ramos Arizpe, Mexico

  • Production years: 2005-2010

  • Cylinder block material: Cast iron

  • Cylinder head material: Aluminium

  • Fuel type: Gasoline

  • Fuel system: Sequential multi-port fuel injection

  • Configuration: V

  • Number of cylinders: 8

  • Valves per cylinder: 2

  • Valvetrain layout: OHV

  • Bore: 103.0 mm (4.06 in)

  • Stroke: 90.9 mm (3.58 in)

  • Displacement: 6,059 cc (370 cu in)

  • Type: Four-stroke, naturally aspirated

  • Compression Ratio: 10.3:1, 10.5:1 (2009+)

  • Power: 425 hp (318 kW) at 6,000 rpm

  • Torque: 420 ft-lb (569 Nm) at 4,800 rpm

  • Firing order: 1-8-4-3-6-5-7-2

  • Engine oil weight: SAE 0W-40

  • Engine oil capacity: 6.6 litres (7.0 qt) with oil filter

  • Oil change interval: 6,000 miles (10,000 km) / 6 months

  • Applications: Chrysler 300C SRT-8, Dodge Magnum SRT-8, Dodge Charger SRT-8, Jeep Grand Cherokee SRT-8, Dodge Challenger SRT-8