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The 5.7-liter Hemi, short for "hemispherical" for the shape of its combustion chamber, was placed in three vehicles in 2005: the Magnum RT, Ram 2500 and Ram 3500. The Hemi engine was made famous in the 1960s but was dropped due to fuel and emission restrictions in the 1970s. The specs on the 2005 5.7 Hemi vary depending on the vehicle it is placed in.
Horsepower
The Hemi 5.7-liter is a V-8 engine built for power. Because of this, consumers look at the horsepower number first. The Magnum is rated at 340 horsepower, the Ram 2500 is rated at 335 horsepower, and the Ram 3500 is rated at 345 horsepower.
Torque
Torque is the engines twisting power; this directly affects initial acceleration. The 5.7-liter engine produces 390 foot-pounds of torque at 4,000 RPM when installed in the Magnum and 375 foot-pounds of torque at 4,200 RPM in the Ram 2500 and the Ram 3500.
Internals
The 5.7-liter has a bore (cylinder width) of 3.92 inches and a stroke (piston travel inside the cylinder) of 3.58 inches. This creates an overall engine displacement of 345 cubic inches. The compression ratio (pressure created in the combustion chamber) is 9.6:1.
Configuration
The 5.7-liter Hemi is a 90-degree, liquid-cooled, V-type engine. It has 16 push rod-style, overhead valves, commonly abbreviated as "16V OHV."
Capacity
The 5.7-liter Hemi has a maximum oil capacity of seven quarts. The coolant/anti-freeze capacity, inside the engine, is 18.7 quarts.
Fuel
The 5.7-liter Hemi is equipped with a multi-displacement system (MDS). This technology electronically and mechanically shuts down four of the cylinders when theyre not needed, typically at highway speeds. The Magnum is the only Hemi-equipped vehicle tested by the EPA for fuel economy; it gets 15 miles per gallon in the city and 23 MPG on the highway. Dodge recommends using 89-octane fuel in the Hemi, but 87 octane is acceptable.
