What Is a Dodge HEMI Engine and How Does It Work?

A Dodge HEMI engine is a V8 internal combustion engine that uses a hemispherical combustion chamber design. This shape allows better airflow, improved fuel-air mixing, and more efficient combustion compared to flat-head designs. Modern HEMI variants include the 5.7L used in Ram 1500 and Dodge Durango, and the 6.4L found in the Challenger and Charger Scat Pack. The 5.7L produces around 395 horsepower, while the 6.4L generates approximately 485 horsepower. HEMI engines also feature Multi-Displacement System technology, which deactivates cylinders during low-demand driving to improve fuel efficiency. They are widely used in performance, hauling, and towing applications.