The piston for an internal combustion engine has at least in areas a coating of ductile material with a thickness of 200 microns or less. The coating consists of a technically high-grade aluminum, and the coating may be applied galvanically. The piston has...

An ignition plug for internal combustion engines fitted with a piezo-ceramic acoustic duct is described. As a result of this, the instantaneous power produced at the moment of ignition of the fuel mixture is increased.