Most people just want a car from point A to point B, others want a car for driving experience provided by a beautifully crafted engine. While all machines have the same basic parts, the parts on the performance engine are not basic. The performance engine is designed to create as much energy as possible and that is the science that is still developing today.

Dodge has several types of engine performance including engines on Dodge Charger, Challenger and Viper models. This is a 6.4 liter HEMI V8 engine, and what every part of the engine does and how it makes the engine a performance engine.

6.4 Liter HEMI V8 Is Powered By SRT

First, let’s introduce the 6.4L SRT engine. 6.4L SRT engine is available in Dodge Charger and Dodge Challenger range. This engine produces 485 horsepower and 475 lb-ft of torque and helps Dodge Charger accelerate from 0-60 mph in a low four-second range and reaches a top speed of 182 mph.

Image result for Dodge Engine HEMI 6.4L SRT Specs Performance


HEMI is a reference to the type of head of the combustion chamber in each cylinder and is actually a very important aspect for engine performance and power. HEMI is a hemispheric combustion chamber and its unique shape provides several benefits. One of the main benefits for the HEMI combustion chamber is the reduction in heat loss, so that the fuel in the combustion chamber burns more efficiently. The second benefit is that there is more room for valves, other details that are very important in power and performance.

Supported by SRT ; Dodge Engineering Team

“Powered by SRT” means that the engine was specifically designed by Dodge Street and Racing Technology (SRT) team. This team is dedicated to producing and refining the line of Dodge performance models. They are responsible for the 6.4L SRT engine, the 6.2L SRT Hellcat engine and the 8.4L V10 engine on the Dodge Viper.

6.4L ; Engine Displacement

6.4 liters is the size of the engine displacement. Most people think of the displacement of the engine as the size of a car engine, but actually it is the cylinder volume of the vehicle and / or the volume of air displaced by the action of the piston. More cylinder volume means that there is more room for air, and more air makes combustion greater, and greater combustion creates more power.

The 6.4-liter engine is equivalent to 392 cubic inches because the two measurements are different units to express the displacement of the engine. Today in the U.S., liters are the most commonly used unit when discussing engine displacement, but cubic inches are usually used before the 1980s. 392 cubic inches is the reason Charger model and Challenger model trimmed with a 6.4L engine named Charger SRT 392 and Challenger SRT 392.

To determine the displacement of the engine, the number of cylinders and the size of the bore and stroke of the cylinder must be known. These numbers are then plugged into the formula. While bore and stroke are not pieces of information given on behalf of the machine, the number of cylinders.

V8 ; Number Of Cylinders

This engine has eight cylinders and they are located on the engine block and are placed in the form of “V,” then the term, V8. Cylinders consist of many parts and cylindrical combustion chambers or cylinder heads where fuel is burned and converted into power.

Because the cylinder is where energy is produced, a cylinder and all its parts are very important for engine performance. Overtime engineers have changed and repaired various cylindrical parts to help the engine maximize performance and handle all the heat and pressure created.

Performance Section

Now for some special engine parts that help make this engine a performance engine.

Oversquare Engine; Bore And Stroke

Bore and stroke refers to the size of the engine cylinder. The 6.4L SRT engine is an oversquare engine, which means that the engine cylinder has a bore (cylinder diameter) that is greater than its step (the length or distance traveled by the piston from 0-180 degrees), making the bore / stroke ratio greater than 1: 1 Oversquare machines allow higher rpm (and hence more power), without excessive piston speed.

The bore and stroke of 6.4 liter Dodge Charger engine is 4.09 inches (bore) and 3.72 inches (stroke). This makes the engine bore and stroke almost 1.1: 1. Type SRT Hellcat engine (other SRT performance engines) has a slightly smaller engine displacement (6.2 liters), but the engine is stronger (707 horsepower and 650 lb-ft of torque ) and has a greater bore: stroke ratio (1.15: 1).


The engine valve is what controls the air and fuel intake into the cylinder and combustion chamber, a very important process. There are two types of valves, inlet and exhaust valves.

6.4L SRT engine has 16 valves with a sodium filled exhaust and 16 hollow stem intake valves. Because exhaust valves are valves that are responsible for bringing hot air out of the combustion chamber, they are filled with a mixture of sodium because the mixture cools the air in the exhaust and allows the valve to handle more heat.

The intake valve is a valve that allows air to enter the combustion chamber and it is easier for the valve to open and the more air it enters, the bigger the explosion. So the lighter the admission valve, the less demanding and quicker it is to open. Therefore, valves with holes are lighter, and they improve performance. You can check out a wide range of dispensing valves on this page.

Engine Block

The materials used in the machine are very important for engine performance. Engine performance works very hard and the temperature becomes very, very hot, so the engine needs to be made of materials that can withstand a lot of pressure and heat.

6.4L SRT engine is made of an iron skirt-in an inner skirt with a crossed main bearing cap, an aluminum alloy header. While the iron block in the skirt and head of the aluminum alloy are the materials used on the Pentastar V6 3.6L engine, the crossed main bearing cap is a special performance modification. The crossed main bearing covers are actually thrown into the final block and they strengthen the block so that everything remains intact and does not break when maximizing engine power.

Compression Ratio

Compression ratio is another factor that affects engine performance and power. The only thing that creates engine power is the size of the explosion of fuel and air in the combustion chamber and more compression creates a bigger explosion. After the compression ratio starts to get bigger, ordinary fuel can start to ignite before the spark plug lights up and this can cause problems. So to prevent that from happening, manufacturers recommend or require higher octane fuel (can withstand greater compression before being turned on) on machines that have a higher compression ratio.

6.4L SRT engine has a compression ratio of 10.9: 1, which is significantly higher than the 3.6L engine compression ratio of 10.2: 1 or the HEMI 5.7L engine compression ratio of 10.5: 1. Premium gas (highest octane) recommended for the 6.4L SRT engine, while midgrade gas is recommended for 5.7L HEMI and regular gas is recommended for the 3.6L engine. For more information related dodge engines Performance visit