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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 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.
Another problem was that oil would pool in the crankcase rather than being pumped, causing the engine to overheat and seriously harm performance. Oil leakage and consumption became such a problem with the bikes, many owners reported losing as much as a quart of oil every 500 miles. In fact, Harley Davidson owner's manuals and shop manuals of ...
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 ...
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.
Harley-Davidson engines are now made at Harley-Davidson Motor Company's Pilgrim Road Powertrain Operations facility in Menomonee Falls, Wisconsin. The company's founders started making smaller flathead motorcycle engines individually by hand and fitted to bicycles in the 10 ft x 15 ft wooden barn in Milwaukee that was the Harley-Davidson ...
Harley-Davidson Twin Cam engine at the Harley-Davidson Museum. The Harley-Davidson Twin Cam are motorcycle engines made by Harley-Davidson from 1998 to 2017. Although these engines differed significantly from the Evolution engine, which in turn was derived from the series of single camshaft, overhead valve motors that were first released in 1936, they share a number of characteristics with ...
Recirculating oil system introduced on all H-D engines in 1936, R became W to denote this. WLA and WLC were military models, WR was a racing model Servi-Car: 45.1 cu in (739 cc) flathead 1932–1936 (R-series engine) 1937–1973 (W-series engine) From 1964, the first Harley-Davidson to have electric starting. [2] Model K and KK