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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 ...
For example, a 1971 Plymouth Barracuda Convertible equipped with the 426 Hemi engine sold at auction for US$3.5 million in 2014. [21] 426 Hemi engine in a 1966 Charger. The street version of the second generation Hemi engine was used (optionally, in all but the last case) in the following vehicles: 1966–1970 Dodge Coronet/Plymouth Belvedere
This helped the corporation cut costs in development, as separate manufacturers like Dodge had to develop their own engines. Tom Hoover's development of the engine was simple. The cylinder head design of the past engines was a wedge, restricting air flow at higher engine revolution speed. The hemispherical cylinder head design increased power ...
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 ...
Forged connecting rods used the Wedge's 3 ⁄ 8 in (9.5 mm) hardware, as opposed to the Hemi's 7 ⁄ 16 in (11.1 mm), but would nonetheless have been considered high-performance parts. [ 1 ] The intake was to be a single Carter ThermoQuad , of greater flow than any previously used, on a dual-plane intake manifold, [ 5 ] while dual four-barrels ...
Donovan completed work on the engine in 1970, and first sold it in 1971; [2] the first driver to use a Donovan hemi was "Kansas John" Wiebe, at the 1971 NHRA Super Nationals, where Wiebe very nearly won Top Fuel. [1] By 1972, it was commonplace in Top Fuel dragsters, [2] and Altereds would also use it. [4]
The Polyspheric engines were V8 engines produced by Chrysler from 1955 to 1958 as lower-cost alternatives to its Hemi engines. [1] These engines were based on the Hemi engines, using the same blocks and crankshaft parts, but completely different cylinder heads, pushrods, exhaust manifolds and pistons.
In this way, the "Hemi" moniker was used for the same kind of marketing cachet as Chrysler's 1950s-1970s Hemi V8 engines. The Hemi-6 valves are angled apart (splayed) 18 degrees (included angle) along the crankshaft axis, and the intake valves are as large as 1.96 in (50 mm). The 6 intake and 6 exhaust valves open slightly towards each other ...