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Chrysler's Multi-Displacement System (MDS) is an automobile engine variable displacement technology. It debuted in 2005 on the 5.7 L modern Hemi V8.Like Mercedes-Benz's Active Cylinder Control, General Motors' Active Fuel Management, and Honda's Variable Cylinder Management, it deactivates four of the V8's cylinders when the throttle is closed or at steady speeds.
It was unveiled at the 2004 New York International Auto Show and subsequently in Europe at Euro Camp Jeep in Ardèche, France. Major features included Quadra-Drive II four-wheel drive, rear-seat DVD player, and optional 5.7 L Hemi V8 engine. The 3.7 L V6 engine replaced the 4.0 L straight-6 engine. Notably, the WK featured independent front ...
The 2009 Jeep Grand Cherokee is available with an improved 5.7 L Hemi engine rated at 357 hp (362 PS; 266 kW) and 389 lb⋅ft (527 N⋅m; 53.8 kg⋅m) of torque. The engine uses variable valve timing to increase fuel economy.
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.
2003–present: Hemi. 5.7L Hemi - The smallest modern Hemi engine, called the Eagle, introduced in 2002. 6.1L Hemi - A larger modern Hemi, 2004–2010. 6.4L Hemi - A larger bore modern Hemi engine, called the Apache, introduced in 2011. 6.2L Hemi - A supercharged Hemi engine, called the Hellcat, introduced in 2014.
The Jeep Commander is a mid-size SUV that was manufactured from 2005 to 2010 by the Jeep division of the American ... Includes: 4.7 L or 5.7 L HEMI V8 engine, ...
Jeep introduced the 2018 Jeep Grand Cherokee SRT Trackhawk at the 2017 New York International Auto Show. The SRT Trackhawk is the highest-performance Grand Cherokee model to date. [35] Specifications. 6.2L Hellcat HEMI V8, 707 hp (527 kW; 717 PS) at 6,000 rpm and 645 lb⋅ft (875 N⋅m) of torque at 4,800 rpm; Requires 91-octane unleaded fuel
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 ...
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