From Mahle.
POWERPAK feature includes:
Forged piston for performance applications
Fully-machined crown
GRAFAL anti-Friction coating on skirts*
Phosphate-coated to reduce micro-welding and pin galling**
Pin bores finished on CNC boring equipment
Hand deburred
High-strength steel pins
Race-proven round wire locks
Low-drag ring pack
Light weight slipper skirt forgings
* MAHLE’s GRAFAL skirt coating reduces drag, scuffing, friction and cylinder bore wear and piston noise.
** Phosphate coating provides the grey appearance to the MAHLE piston. This dry lubricant coating (not to be confused with a thermal film coating) provides a lubricant film in the pin bores and ring grooves until the oiling system of the engine reaches operating pressure; particularly useful during the initial start-up or break-in of engines to protect against galling and microwelding. The piston crown is still machineable.
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