Abstract: An internal combustion engine in the form of a frictionless turbine includes a piston and a combustion chamber with a combustion chamber wall, which is frictionless because it has no piston rings so that the pistons do not touch the combustion chamber wall. There is clearance between the piston and the chamber wall, so that no piston lubrication is provided or needed, and the absence of friction between the piston and chamber wall permits the turbine to reach very high speeds. Computer control preferably is provided to meter fuel into the combustion chamber as turbine revolutions per minute increase from starting speed to full speed to maximize engine smoothness of operation and efficiency.