Chrysler started putting HEMI engines in production cars in 1951, making the HEMI "Fire Power" V8 standard in the New Yorker, Crown Imperial, Imperial and Saratoga that year. In 1955, the company introduced the Chrysler 300, which has a four-barrel, HEMI engine with a 331-cubic inch displacement. It was the first production car with 300 horsepower and it ignited the "horsepower wars" what lasted into the 1970s. The HEMI engine has seen numerous innovations and advancements through the past 60 years and is used in a range of vehicles, including the Dodge Ram pickup, the Durango SUV, the Jeep Grand Cherokee, and the Dodge Magnum and Dodge Charger. The 2007 HEMI comes as either a 5.7-liter V8 or a 6.1-liter V8.
Horsepower and Torque
The horsepower and torque varies significantly depending both on the size of the 2007 HEMI engine and the model of the car it was in. The 5.7-liter engine achieves 330 horsepower at 5,000 rpm and 375 foot-pounds of torque at 4,000 rpm in the 2007 Jeep Commander and Jeep Grand Cherokee. However, the 5.7-liter, 2007 HEMI is capable of 350 horsepower at 5,000 rpm and 390 foot-pounds of torque at 4,000 rpm in the 2007 Dodge Charger R/T. The 6.1-liter, 2007 HEMI engine is capable of 425 horsepower at 6,000 rpm and 420 foot-pounds of torque at 4,800 rpm in all models it is available in.
Physical Construction
The 2007 HEMI engine has a cast-iron cylinder block with a cross-bolted main bearing caps that are used four bolts per cap. The cylinder head is made of A319F aluminum and has a cross-flow design with a hemispherical combustion chamber and 16 valves. The valvetrain has a single "beehive" design.
Fuel Injection and Ingition Systems
All 2007 HEMIs use a sequential, multi-port fuel injection system with electronically controlled combustion. They rely on a distributor-less and coil-near-plugs ignition system with two spark plugs per cylinder. The firing order of the cylinders is 1-8-4-3-6-5-7-2.
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