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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 ...
2014 Ram 1500 Urban Concept – The 2014 Ram 1500 Urban Concept features a 6.4 L (390 cu in) Hemi V8 producing 470 hp (350 kW) and 470 lb⋅ft (637 N⋅m) of torque. The engine comes from the Dodge Challenger SRT8 which is paired with a 5-speed automatic W5A580 transmission or a 6-speed manual Tremec TR6060 transmission.
The 5.7 L HEMI engine for 2005-2008 has slightly less horsepower than those found in the Dodge Ram or the Dodge Charger (330 vs 345) due to different engine control unit (ECU) programming. The 5.7 L HEMI engine for 2009 and up was upgraded with Variable Cam Timing (VCT) adding 27 hp (20 kW; 27 PS) and 14 lb⋅ft (19 N⋅m) of torque.
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.
With a high lift cam and single plane intake, the crate Magnum 360 cu in (5.9 L) was rated at 380 hp (283 kW) with the Magnum heads. Later models equipped with "R/T" or aluminum cylinder heads produced 390 hp (291 kW). A 425 hp (317 kW) bolt-in fuel injection conversion kit has also been available.