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By canting the angle of the NASCAR-mandated two valves per cylinder, significantly larger valves could be used. Both the Chrysler 426 Hemi and all Chrysler RB engines were oversquare, with the 426 Hemi and 426 Wedge sharing a 4 + 1 ⁄ 4 in × 3 + 3 ⁄ 4 in (108.0 mm × 95.3 mm) bore and stroke. Blocks for the 426 Hemi were stress relieved at ...
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 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 ...
This engine family was Chrysler's first 60° V6 engine designed and built in-house for front wheel drive vehicles, and their first V6 not based on a V8. It was designed as a larger, more powerful alternative to the Mitsubishi 3.0 V6 in the minivans and debuted in 1989 for the 1990 model year.
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 ...
This was Chrysler's first thin wall (lightweight) cast iron engine design. Chrysler Australia wanted a new six-cylinder engine for use in the Australian Chrysler Valiant, and so Chrysler USA sent a prototype engine to Chrysler Australia's engineers to continue developing the D-engine. The first 245 cu in (4.0 L) variant was released for the ...
Chrysler used a 14 mm (0.55 in) spark plug, rather than the typical 18 mm (0.71 in), in an effort to fit it as centrally as possible in the combustion chamber. [ 1 ] The intake and exhaust valves were the same size as the 426's, [ 6 ] the 2.25 in (57 mm) intake canted at 15° from the bore centerline, the 1.94 in (49 mm) exhaust at 6°. [ 6 ]
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 ...