Engine: Description and Operation

DESCRIPTION





The 6.4L HEMI eight-cylinder SRT high performance engine is a 90° V-Type, deep skirt, lightweight cast iron block with aluminum heads, single cam, overhead valves, and hydraulic roller lifters. The heads incorporate splayed valves with a hemispherical style combustion chamber and dual spark plugs. The cylinders are numbered from front to rear; 1, 3, 5, 7 on the left bank and 2, 4, 6, 8 on the right bank. The firing order is 1-8-4-3-6-5-7-2. The 6.4L HEMI engine is a bored and stroked version of the 5.7L HEMI engine developed for SRT high performance vehicles. This engine shares the same architecture as the 2009 5.7L HEMI with the following Performance Upgrades:

- Increased Bore
- Increased Stoke
- Increased Valve Sizing

The 6.4L HEMI engine also has improved horsepower, torque and fuel economy as compared with the 6.1L HEMI engine. This is achieved with the larger displacement and the following Technical Improvements:

- Variable Cam Timing (VCT) Cam Phasing System
- Multi-Displacement System (MDS)
- High Flow Ports
- Increased Maximum RPM
- Combustion Chamber Shape
- Higher Compression Ratio