5.7 Hemi V8
The 5.7 L Hemi was released for model year 2003 on the Dodge Ram 1500, 2500, and 3500 pickup trucks to complement the Magnum 5.9 engine. As of 2004 it was the only available gasoline engine in the Ram Heavy Duty. Chrysler later made the 5.7 L Hemi available in all models of the 2004 Dodge Ram, Dodge Durango, the 2005 Chrysler 300C, Dodge Magnum R/T, Jeep Grand Cherokee, the 2006 Dodge Charger R/T, and the 2009 Dodge Challenger R/T. For the Challenger, the 6-speed version does not feature MDS. The 2014 5.7 Liter Hemi does have the MDS with 395HP.
The 5.7 L (345 cu in) Hemi in the Ram delivered 345 hp (257.3 kW) and 398 lb?ft (540 N?m), but 340 hp (253.5 kW) and 390 lb?ft (529 N?m) for the 300C and Magnum R/T, which is exactly 100 hp (74.6 kW) more than the old 5.9 engine. It is a 90-degree V8, 2-valve pushrod design like the past MB engines, displacing 5,654 cc (345 cu in), with a bore of 3.917 in and a stroke of 3.578 in.
6.2 Liter V8
Chrysler displayed a larger and more powerful 392-cubic-inch (6.4 L) Hemi in 2005 with a conservative factory-rated output of 525 hp (391 kW; 532 PS) and 510 lb/ft (691 N/m) torque. It is equipped with high-strength forged aluminium alloy pistons. This engine has been available since 2007, as a crate under the name 392 Hemi.
The production version of the 392 Hemi was launched in the 2011 Dodge Challenger SRT8 with variable camshaft timing as well as MDS in cars with automatic transmissions. The new 392 Hemi, codenamed “Apache,” is based on the third-generation 5.7L Hemi, codenamed “Eagle,” and shares few parts with the 392 crate engine. In late 2009 Chrysler has said the new engine will be available in the next generation SRT8 Dodge Charger, Chrysler 300C, and Jeep Grand Cherokee. Special-edition Challengers equipped with this engine, and the engines themselves, will bear “392 HEMI” badging in commemorative reference to the first-generation Hemi engine of the same piston displacement. In other applications, the engine is badged as “6.4L HEMI”. It is much more similar to the revised 5.7L V8 Hemi that was released in 2009 and is a completely different block and build than the 392 crate engine. Output is 470 hp (350 kW) and 470 lb/ft (637 N/m); for the 2015 model year, horsepower was increased by 15, to 485 hp (362 kW) and 475 lb?ft (644 N/m), in the Charger and Challenger; the Grand Cherokee SRT only saw a 5 bhp increase. The engine is available in the Chrysler 300 SRT8, Dodge Charger SRT8 (and Charger R/T Scat Pack for 2015), the Challenger R/T Scat Pack (2015-up) and SRT, and the Jeep Grand Cherokee SRT8.
In 2014, Chrysler chose to change the SRT8 moniker to SRT, removing the 8 which was a cylinder quantity nomenclature. From thereon, this was put into effect for all SRT models from all of Chrysler’s divisions.
For 2015, Chrysler introduced an all-new high performance supercharged variant of the Hemi engine, called the Hellcat (named after the Grumman F6F Hellcat). It features the same 103.9 mm (4.090 in) bore as the 6.4 L Hemi and the same 90.9 mm (3.578 in) stroke as the 5.7 L, giving it a total displacement of 6,166 cc (376.3 cu in). The supercharger is a 2,380 cc (145 cu in) twin-screw IHI unit with integrated charge coolers, capable of producing 11.6 psi (80 kPa) of boost. This engine is rated at 707 hp (527 kW) and 650 lb?ft (880 N?m) and has a 9.5:1 compression ratio. This engine was the most powerful engine produced by Chrysler as well as the most powerful production engine ever in a muscle car until the Dodge Demon was introduced. This engine is not equipped with Chrysler’s Multi-Displacement System.