Hemi is due ldquo; hemisphericalrdquo; the word acronym is due to the engine with hemispherical combustion chamber named, Hemi engine since the fifties of the last century has been born, has flourished for more than half century. Characterized by engine cylinder intake and exhaust valves are arranged with tilt angle, a better use of air intake and exhaust efficiency of the lifting cylinder, the cylinder combustion chamber and thus has a hemispherical shape, this cylinder design still in use. ldquo; HEMIrdquo; engine first appeared in 1948, when the development of a six-cylinder HEMI engine for Jaguar, followed in 1951, Chrysler released a 180-horsepower V-8ldquo; HEMIrdquo; engine displacement 5.4 liter (331 cubic inches), hence the name ldquo; 331 HEMIrdquo ;. Although a lot of money for what modern 180 hp engine, available at the time, this is a difficult to reach the pinnacle of power, thus opening up the era of the legendary HEMI’s.
“331 HEMI engine.”
with respect to the HEMI head hemisphere, flat-topped cylinder head of the engine of choice for most of the 1950s models, such a structure due to the lower manufacturing cost. Intake and exhaust valves of the engine combustion chambers arranged in a flat top side of the engine, the cam shaft is directly driven by the tappet omitted and arm system. Compared with contemporaries engine, the biggest advantage is that early HEMI engine combustion efficiency, so that it can produce a more powerful power. Topping combustion chamber hemispherical HEMI engine, the spark plug is typically mounted in the center of the top of the combustion chamber, intake and exhaust valves, one each side of the combustion chamber.
After the 1970s, the performance HEMI engine has been watered down, and new engine technologies such as multi-valve structure, variable valve lift and ignition timing technology and lean-burn direct injection technology and other dazzling new things have turned the once glorious HEMI logo drowned. When people have gradually forgotten the HEMI, Chrysler released a new 5.7-liter HEMI V-8 engine.
“HEMI 5.7L V8 launchedMachine “
HEMI V-8 engine can be automatically converted between a smooth four-cylinder mode and the 8-cylinder mode within 40 milliseconds, when not in full power operation of the engine, four cylinders can momentarily turned off, and when needed, MDS and can quickly resume work cylinder engine at full power release, which will greatly improve fuel economy, fuel compression ratio of 7.5: 1, this technology can guarantee that combined fuel consumption of the vehicle by 20 percentage.