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Chrysler developed its first experimental hemi engine for the Republic P-47 Thunderbolt fighter aircraft. The XIV-2220 was an inverted V16 rated at 2,500 hp (1,860 kW). The P-47 was already in production with a Pratt & Whitney radial engine when the XIV-2220 flew successfully in trials in 1945 as a possible upgrade, but the war was winding down and it did not go into production.
A hemispherical head ("hemi-head") gives an efficient combustion chamber with minimal heat loss to the head, and allows for two large valves.However, a hemi-head usually allows no more than two valves per cylinder due to the difficulty in arranging the valve gear for four valves at diverging angles, and these large valves are necessarily heavier than those in a multi-valve engine of similar ...
An upgrade is available to the 5.7-liter (350 cu in) Chrysler Hemi, a V8 engine, which produces 395 horsepower (295 kW) and 410 pound force-feet (556 N⋅m) of torque. The engine is equipped with Variable Cam Timing (VCT) and a Multi-Displacement System (MDS) which shuts down four of the engine's eight cylinders when operating between 1,000 and ...
The Chrysler B and RB engines are a series of big-block V8 gasoline engines introduced in 1958 to replace the Chrysler FirePower (first generation Hemi) engines. The B and RB engines are often referred to as "wedge" engines because they use wedge-shaped combustion chambers; this differentiates them from Chrysler's 426 Hemi big block engines that are typically referred to as "Hemi" or "426 Hemi ...
The Hemi-6 is a pushrod O.H.V. (overhead valve engine), with combustion chambers comprising about 35% of the top of the globe. This creates what is known as a low hemispherical shaped chamber. In this way, the "Hemi" moniker was used for the same kind of marketing cachet as Chrysler's 1950s-1970s Hemi V8 engines.
The HJ 5.0L was a very different engine to the HT-HQ 308 though. It got a raise in compression from 9:1 to 9.7:1 and got a new camshaft which was basically the same valve timing as used in the HK-HQ SBC engines (prior to HJ the 308 used the 253's smaller camshaft but retarded 5 degrees).
Overland - 2007–2009: Includes: 5.7 L Hemi V8 engine, AM/FM radio with GPS navigation and six-disc integral CD changer, Sirius satellite radio, wire mesh grille insert, leather-and-suede seats with embroidered Overland logos, wood-trimmed steering wheel, leather-wrapped emergency brake handle with leather-wrapped door handles as well, and ...
For 2009, Variable Camshaft Timing was added, raising power output levels to 368 hp (274 kW) and 395 lb⋅ft (536 N⋅m) of torque respectively. The SRT8 model comes with the 6.1 L (370 cu in) Hemi V8 , which is rated at 425 hp (317 kW) and 420 lb⋅ft (569 N⋅m) of torque.
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