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In a hemispherical cylinder head, when air enters the combustion chamber through the intake valve, it flows to the exhaust valve instead of being forced through the exhaust valve as pressure is built up in the combustion chamber. While Tom Hoover developed the 426 Hemi engine, cylinder heads can be interchanged between specific engines.
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 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 ...
Intended to deal with the troubles created by the low-production 426, of which only about 9,000 were built from 1966 to 1972), [4] as well as the different architectures of the higher-volume 383 cu in (6.3 L) and 400 cu in (6.6 L) B and 440 cu in (7.2 L) RB V8s, the ball-stud hemi was to be suitable for high-volume manufacture at low cost while ...
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.
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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Optional were the 440+6 barrel (three 2-barrel carburetors) and the 426 Hemi. In keeping with the GTX marketing strategy, the 1970 model included many standard features. The only other performance luxury model in Plymouth's lineup was the full-size Sport Fury GT, built on the C-Body platform.