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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 ...
Chrysler applied their military experience with the hemispherical combustion chamber to its first automobile engine, an overhead-valve V8 engine released under the name FirePower, not "Hemi," in 1950 for the 1951 model year. The first version of the FirePower engine had a displacement of 331 cu in (5.4 L) and produced 180 bhp (134.2 kW).
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 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" due to their hemispherical shaped combustion chambers. The corporation had been seeking a smaller and lighter ...
The engine's name is an acronym for either Compound Valve-angle Hemispherical or Canted Valve Hemispherical, where "Hemispherical" describes the shape of the combustion chamber. [ 1 ] [ 2 ] The CVH was introduced in 1980 in the third generation European Escort and in 1981 in the first generation North American Escort .
The unusual depth of the engine's cylinder head was dictated by the desire to make room for two generously-sized valves, whilst not excessively restricting the flow of gases into and out of the hemispherical combustion chambers. To satisfy these two conditions, a relatively wide angle between the valves was initially chosen, with quite long ...
Boxer engine showing offset cylinders The /5 models are air-cooled, four-stroke, opposed-twin (boxer) engines with hemispherical combustion chambers . The engine is built around a one-piece tunnel crank-case.
The 3V, 4V and 5V engines were used in the Toyota Century up until 1997, when it got a complete redesign and replaced the V8 for the 5.0 L 1GZ-FE V12. The V series engines, like several Toyota Motor Corporation engines (e.g. 2T-C, 2M, 4M etc.) at the time had a hemispherical combustion chamber. The position of the spark plugs, like the 2T-C and ...