Six Things Not to Do with a 6.4 Engine

Racer X has published a video, listing the following 6 basic things you should avoid on a 6.4 liter equipped Scat Pack:

1. 87, 89 or 91 octane gas (use 93).
2. 245/45-20 tires (As a minimum, install 275s).
3. Don't straight pipe the exhaust (excessive drone).
4. Don't unlock the PCM for tuning while under warranty.
5. Don't install an aftermarket air intake for additional power.
6. Use proper 0W-40 viscosity oil and check the level on a regular basis.

 

The PCM will retard the ignition to prevent pre-detonation (pinging).

 

There are many 6.4 engines that are running superchargers. Assuming a properly tuned system, proper oil change and engine maintenance and similar driving, supercharging generally, will not shorten the life of an engine, just as is the case with OEM turbocharging (with proper cooldown for turbochargers.

Four excellent brands are Procharger, Hennessey, Magnuson and Whipple. Expect to pay up to $7K for a complete kit. A cheaper, less cosmetically pleasing one, is an Edelbrock. Check out these websites.

Installing a ProCharger Supercharger on a Late-Model 6.4L Hemi (motortrend.com)


Hennessey Launches Supercharger Kit For Dodge 6.4-liter HEMI V8 Engine | Top Speed

http://www.modernmusclextreme.com/p-1617-2011-2021-64l-hemi-300c-supercharger-kit-by-whipple.aspx


You should be aware, however, that when Dodge developed the 707 hp. 6.2 supercharged engine, one of its concerns was reliability. To avoid unnecessary warranty claims, several things were done to the engine to enhance its strength. Here are some of them:

·Forged aluminum pistons are unique to deliver the 9.5:1 compression ratio.

·A new structure and alloy was used for the connecting rods and pistons.

· Pistons have DLC (Diamond-Like Coating) to reduce friction losses and increase the load-carrying capacity.

·Shorter piston stroke- advantageous considering the block-deck height and connecting rod length used is from the 6.4 HEMI engine. One of those is the increase in compression height of the pistons.

·More piston material between the piston crown and wrist pin (creates more space for beefier ring land and allows the top ring to push farther down the bore. This prevents the components from extreme cylinder pressure and heat).

·The first compression ring features a PVD coating.

·Piston skirts are graphite coated, and the piston pin is DLC coated.

·Increased crank overlap between the main journals and rod journals that overlap each other.

·Cylinder head is cast with upgraded 356-T6 alloy.

·Enhanced 6.4 forged crankshaft to improve wear resistance as well as performance. The crank journals are induction-hardened– a localized treating process for the entire crankshaft compatible with higher-load capacity bearings.

·The crank fillets have increased fatigue strength; the microgeometry and bearing clearances are optimized on the Hellcat Hemi crank. The carbon-coated pistons swing on floating pins for enhanced load resistance.

·Better cooling efficiency with a new and distinct water jacket geometry to allow for better water flow around the top of the cylinder to regulate the temperature on the bore walls and head gaskets to prevent premature deterioration).

·The pulley bolt size was increased by 2mm, and a diamond-coated washer between the crank and pulley offered a high friction coefficient.

·Has special hollow-stem, sodium-filled exhaust valves capable of withstanding high temperatures up to 1475 Fahrenheit.


https://www.enginelabs.com/news/hellcat-hemi-chief-engineer-provides-engine-details/

 

RacerX claims that aftermarket intakes do not produce any additional horsepower. Watch his video at the 5:14 minute mark.