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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.
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 ...
The firing order of older big-block engines is 1-8-4-3-6-5-7-2 [62] while Vortec 8100's firing order is 1-8-7-2-6-5-4-3. Other upgrades of Vortec 8100 include a new 18-bolt head bolt pattern, longer connecting rods, different symmetrical intake ports, different oil pan rails, and the use of metric threads throughout the engine.
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.
The 5.7-liter Hemi VVT V8 returned with 360 hp (268 kW; 365 PS) and 390 lb⋅ft (529 N⋅m; 54 kg⋅m) of torque, which features the 545RFE five-speed automatic. The Hemi V8 also comes with a "fuel-saver" (cylinder deactivation) mode. This feature is primarily used when the vehicle is cruising at constant speeds on level ground.
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 ...
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 ...
2005 was the last year for the first version of the 5.7 L (345 cu in) Hemi V8. 2006 half-ton models offered the Multi-Displacement System Hemi V8 engine that also became available in Chrysler and Dodge sedans. This engine featured the same performance but had a cylinder-deactivating feature enabled under light loads to increase fuel economy by ...