The new 6.1-liter SRT version of the legendary HEMI engine was inspired by the original family of HEMIs – particularly the namesake hemispherical combustion chambers that provide power and efficiency and select visual cues, including the classic orange-painted cylinder block and black valve covers.
The new engine also matches the legendary “Street HEMI” of the 1960s and 1970s with its 425-horsepower rating. But it does so with less displacement. The 6.1-liter HEMI’s 69.8 horsepower-per-liter rating exceeds that of the Street HEMI.
Today’s SRT HEMI is subject to many requirements that older engines didn’t have to meet – requirements for emissions and fuel efficiency.
With the Chrysler Group’s clean and efficient all-new 5.7-liter HEMI as a starting point, SRT powertrain engineers developed 85 more horsepower by adding more cubic inches, increasing the compression ratio, redesigning the cylinder head, intake and exhaust systems for increased flow, and increasing engine speed.
For more displacement, SRT engineers bored out the diameter of the cylinders in the HEMI by 3.5 millimeters each in order to increase the total displacement to 6.1 liters from 5.7 liters.
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