A piston (20) has a skirt (22) with a surface (24), which is at least partially polished and thereafter coated with a coating (26) having a hardness of greater than 8 GPa and having a coefficient of friction of less than 0.20. [0002] The piston has an incr...

The engine has a combustion chamber (2) with intake channel, outlet channel (3), and fuel supply . The outlet channel contains an adsorption and/or absorption element for intermediate storage of or uncombusted or partially combusted fuel. The element is fo...