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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.
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.
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 Tornado first appeared in civilian Jeep vehicles in 1963 and was only used until 1965. The US Army M-715 and derivatives used it through the 1960s and early 1970s. The AMC and Kaiser engines do not share bellhousing bolt patterns. Cam trouble on the 230 was common due to inadequate oil formulations of the time.
An SRT version was unveiled at the 2011 New York International Auto Show, featuring the 6.4 L 392 Hemi V8 engine. The 6.4 L 392 Hemi engine is also used in other Chrysler Group SRT vehicles such as the Dodge Charger and Challenger. With 470 hp (350 kW), the new 300 SRT can go from 0 to 60 mph (97 km/h) in the low 4-second range. [49]
Powered by a Hemi 392 slightly modified for road racing extremes and restricted by class rules, the cars made around 500 horsepower. Except for the slightly bulged fenders and a large rear wing, the cars look much like the stock/street version despite being roughly 7/8s the size of the road car.
The camshaft was the HO cam with 288/301 duration. It was the top-of-the-line engine unless one opted for the "Ram Air" V-8 derived from it. As Pontiac's 1967 performance brochure said, "You can add the Ram Air induction hood scoop and new high output cam and valve springs to the Quadra-Power 400 for better top end breathing."
Bore x stroke are 95.5 mm × 87.7 mm (3.76 in × 3.45 in) and compression ratio is 10.9:1. The valvetrain is a dual overhead cam (DOHC) design with a continuously variable valve timing control system . The engine also features Nissan's VVEL valve timing technology. [5]