Chrysler 5.7L Hemi V-8

5.7L Hemi Specs, History, and Information

That thing gotta hemi? After a long hiatus, Chrysler reintroduced the Hemi to its engine portfolio for the 2003 model year. It's first application would be the Ram 1500, 2500, and 3500 pickup models, however the engine would find homes in many Chrysler products beginning in the 2004 model year. The engine is and has been produced at Chrysler's Saltillo Engine Plant in Ramos Arizpe, Mexico. The 90 degree pushrod V-8 features hemispherical shaped combustion chambers, providing improved breathing of the cylinder head during the intake and exhaust strokes resulting from the canted angle of the valves.

The engine's greatest disadvantage, at least for truck applications, is its sharp torque curve that peaks at relatively high engine speeds. This characteristic lacks the low end torque favored in applications where towing and hauling needs are frequent and requires operating at higher engine speeds to realize the engine's full performance. On the contrary, the engine produces respectable peak horsepower and torque considering it displaces a mere 345 cubic inches. To help with emissions and address flame propagation concerns inherent of most engines with hemispherical combustion chambers, the 5.7L utilizes a dual spark plug design with a secondary spark plug firing at the start of the engine's power stroke.

The 5.7L Hemi underwent many changes for the 2009 model year, including a higher compression ratio, active intake manifold, variable camshaft timing, and a multi-displacement system (MDS). The active intake runner system allows the engine to utilize short and long runners in the intake manifold. To increase low end performance, the short intake runners are blocked off and air flows through the long intake runners at low engine speeds. At higher engine speeds, the intake manifold opens up the short runners for improved top end performance. The multi-displacement system deactivates cylinders 1, 4, 6, and 7 under low load conditions to improve fuel economy.

5.7L Hemi V-8 Specs

Engine Chrysler 5.7L Hemi V-8
Configuration 90° pushrod V-8
Assembly Plant(s) Saltillo Engine Plant, Ramos Arizpe, Mexico
Applications 2003 - current Ram 1500/2500/3500
Many Chrysler car/SUV applications - these specifications focus on the Ram truck version
Displacement 345 CID, 5.7 liters
Firing Order 1 - 8 - 4 - 3 - 6 - 5 - 7 - 2
Bore 3.917 in (99.49 mm)
Stroke 3.578 in (90.88 mm)
Compression Ratio 9.6 : 1 (2003 - 2008 model years)
10.5 : 1 (2009+ model years)
Engine Block Material Cast iron
Cylinder Head Material Cast aluminum alloy
Aspiration Naturally aspirated
Ignition Coil-near-plug, 2 spark plugs per cylinder
Valvetrain 2 valves per cylinder, OHV pushrod V-8, hydraulic roller lifters, variable valve timing (VVT/VCT, 2009 MY+)
Fuel Injection Multi port sequential fuel injection
Fuel Requirements Regular unleaded gasoline (premium fuel recommended, not required)
Oil Capacity 7.0 qts w/ filter change
Engine Weight ~ 500 lbs
Horsepower 2003 - 2008 Ram 1500/2500/3500 345 hp @ 5,600 rpm
2009 - 2012 Ram 1500 390 hp @ 5,600 rpm
2009 - current Ram 2500/3500 383 hp @ 5,600 rpm
2013 - current Ram 1500 395 hp @ ,5600 rpm
Torque 2003 - 2008 Ram 1500/2500/3500 375 lb-ft @ 4,400 rpm
2009 - 2012 Ram 1500 407 lb-ft @ 4,000 rpm
2009 - current Ram 2500/3500 400 lb-ft @ 4,000 rpm
2013 - current Ram 1500 410 lb-ft @ 3,950 rpm
Maximum Engine Speed 5,800 rpm
Accolades Ward's 10 Best Engine List 2003, 2004, 2005, 2006, 2007, and 2009

5.7L Hemi V-8 Horsepower and Torque Curves

5.7L Hemi V8 horsepower and torque graph
2012 model year Ram 2500/3500 horsepower and torque curve for 5.7L Hemi equipped trucks