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The Polyspheric or Poly engines were V8 engines produced by Chrysler from 1955 to 1958 as lower-cost alternatives to the 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.
The Hemi 5.7L engine was dropped (except only Mexico-market Ram 4000), and the Hemi 6.4L becomes the base engine. For 2500 and 3500 pickups with the 6.4L, a ZF 8HP75-LCV 8-speed automatic is mated. The 6.7-liter Cummins turbo-diesel returns in both Standard and High-Output form, but with a new compacted graphite iron (CGI) block.
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 2025 Ram 1500 is set to arrive with a refreshed look and two new engine options under the hood. The Hemi V-8s are gone from the full-size pickup, with a pair of Hurricane twin-turbocharged 3.0 ...
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.
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 ...
The Venom F5 features a bespoke proprietary 6.6-liter twin-turbocharged V8 engine, making this the company's first in-house engine. [16] It is rated at 1,817 hp (1,355 kW; 1,842 PS) and 1,193 lb⋅ft (1,617 N⋅m) of torque. [17] Pennzoil and Shell are partners with Hennessey for the project to help reach the 300 mph (483 km/h) top speed mark.
The first version of this engine family was a normally aspirated 2.2 L (134 cu in) unit. Developed under the leadership of Chief Engineer – Engine Design and Development Willem Weertman and head of performance tuning Charles "Pete" Hagenbuch, who had worked on most of Chrysler's V-8 engines and the Chrysler Slant-6 engine, [1] it was introduced in the 1981 Dodge Aries, Dodge Omni, Plymouth ...