There are three different basic types of coatings used on various engine, transmission and brake parts to enhance the components performance and extend its useful life. The three types of coatings are explained below.
Thermal Barrier is an excellent heat barrier and is recommended for the bottom of intake manifolds & exhaust crossovers to reduce heat transfer. It may also be applied to windage trays, crank scrapers and crankshafts for oil shedding. In certain instances Thermal Barrier may be desirable on the inside of oil pans where good heat retention is desired, such as at drag races, where oil in the pan may become cold while waiting in staging lanes.
Thermal dispersants create a chemical and corrosion resistant film that increases the ability of a coated part to radiate heat. TDC provides for more even distribution of heat over the coated surface and moves it rapidly away. TDC is blended with lubricating agents which aid in keeping a coated part clean. Dirt and debris cannot get a good grip and become easier to clean off. The appearance of coated parts depends on the surface texture, the coating will show a semi gloss appearance on machined surfaces and a satin appearance on rough textures. Both finishes are very eye appealing.
Dry-Film Coating is a moly-based lubricant capable of providing lubrication at levels as high as 350,000 psi. The lubrication aids in preventing scuffing and galling, increasing part life. It also reduces friction, freeing more useable power. This lubricant provides extra protection by preventing damage from oil film failure. Dry-Film Coating is actually impregnated into the metal surface so no dimensional changes are realized. In addition to lubrication, Dry Film Lubricants also help distribute heat so less metal fatigue is caused reducing the chance of part failure.
Engine Coatings provide the following benefits:
- Increases HP and Torque
- Reduces part temperature
- Reduces friction
- Increases combustion chamber efficiency
- Sheds carbon
- Keeps heat in the combustion chamber and exhaust system
- Disperses heat from intake manifolds, cylinder heads, oil pans, brake components and carburetors
- Reduces thermal transfer into intake manifold, heads, brakes
- Reduces corrosion and chemical damage to parts
- Reduces fuel separation and drop out
- Increases port and exhaust velocity
- Extends part life
The graph below shows the horsepower increase with just the pistons being coated. Notice the much broader horsepower gains achieved at the last 500 rpms. This is where frictional drag is most evident during engine operations. Combustion chamber efficiency has dropped and frictional drag is pulling the engine down. The HP is significantly higher in the coated engine due to the action of the friction reducing coating.
It has been proven that almost any V-8 engine will show approximately a 10 HP gain with only the top and the skirts of the pistons being coated. A totally coated engine has shown a 68 HP increase in independent, back to back dyno test. Partially coated engines have shown 20 to 25 HP increases.