With plasma transferred wire arc, electricity in a plasma cloud vaporizes metal wire, which is then sprayed onto the cylinder walls of an engine block with an air jet. Only the sections of the cylinder walls that the piston rings travel over are treated. Ford is saving more than 6 pounds per engine with the process.
Despite cheap gasoline prices in the U.S., the march to remove weight from light vehicles continues.
General Motors' Cadillac CT6 luxury sedan, for example, will feature 13 different materials customized for each area of the car to simultaneously advance driving dynamics, fuel economy and cabin quietness.
Automotive News article here