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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.
The engine was a race-spec 426 Hemi. These motors had a compression ratio of 10.25:1 pistons , bore x stroke 4 + 1 ⁄ 4 in × 3 + 3 ⁄ 4 in (108.0 mm × 95.3 mm) fed through a 2X4-barrel Holley carburetors atop a lightweight crossram aluminum intake manifold rated at 425 hp (431 PS; 317 kW) at 5,000 rpm and a maximum torque of 490 lb⋅ft ...
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 ...
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 standard engine was the 440 Magnum, but factory literature described the 426 Hemi as standard. The Charger 500 had the Torqueflite standard and the same equipment standard as the R/T. A total of 392 Charger 500s were made, of which only 67 had the 426 Hemi engine, 27 with a 4-speed, and 40 with an automatic transmission.
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 ...
A 1970 Dodge Super Bee that Feiburger purchased in tribute to one he owned when he was 15 years old; powered by a 426 cubic inch Mopar Hemi. Owned by Freiburger 70 [26] Lost Boys Racing Hornet [working-title] 1973 AMC Hornet that "raced Baja in the '80s and finished the NORRA 1000 a couple of times before being parked in 2012."
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.