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Note the coatings on this piston top and skirt. The gold-colored coating on top is a thermal barrier, while the black coating on the sides is a poly-moly lubricant film to minimize friction. Swain Tech Coatings does all Nelson's work, and these aren't the pistons headed into the "Challenge" engine, but the coatings will be identical.
The Hunger

Note the coatings on this piston top and skirt. The gold-colored coating on top is a thermal barrier, while the black coating on the sides is a poly-moly lubricant film to minimize friction. Swain Tech Coatings does all Nelson's work, and these aren't the pistons headed into the "Challenge" engine, but the coatings will be identical.  View Related Article

 

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