Besides the obvious shine, ASF (Accelerated Surface Finishing) deburrs and smoothes the surface which reduces
carbon build up, possibility of stress risers and also aids in shedding oil from the piston underside. There are different
approaches that can be taken, either the entire piston can be treated, or just the dome and underside depending on
when the process takes place.
Ceramic Crown Coating
This coating reflects heat into the combustion chamber and away from the piston crown, while lowering piston
temperatures for increased part life. The engine can experience improved combustion and performance as a result of
heat being reflected back into the fuel charge.
Anodizing the piston reduces wear and material transfer. Anodizing can be done to the entire piston or a selective
area depending on its usage. Anodizing the entire piston has been shown to be very durable in drag racing
Skirt Coat / Moly Dry Film Coating
The application of molybdenum to the piston skirt, used to reduce friction between the piston and the cylinder during
engine operation. It also helps during cold start ups and high temperature operation where a substandard oil barrier
on the cylinder wall could exist.
Top Ring Groove
Some pistons require only the ring groove(s) anodized in order to lessen the chance of micro- welding the ring to the aluminum groove.
WPC is a treatment that enhances the surface to reduce friction by firing ultra fine particles towards the surface of a
piston or wristpin at very high speeds. The thermal discharge permanently changes the surface, strengthening the
structure and creating a harder more durable final product. Its unique micro-dimple formation pattern greatly reduces
friction and helps retain oil.