The engine takes its name from the hemispherical shape of the combustion chambers; this design maximizes energy transfer to ...

Chrysler introduced the third-generation HEMI V8 engine in 2003 ... to be more efficiently transferred to the head of each piston. The 5.7-liter HEMI first appeared under the hoods of 2003 ...

A diesel engine's piston head looks like someone took a scoop ... Whereas, by comparison, the gas-powered Hemi option in the same Ram only has a 10.9:1 compression ratio. These engines require ...