Abstract: This invention relates to a mechanism and method for enhancing the performance of both two stroke and four stroke cycle reciprocating piston internal combustion engines, reciprocating piston pumps and compressors by generating an Epitrochoidal path of travel for the lower end of the connecting rod. The piston, attached to the upper end of the connecting rod, will be made to dwell at the lower part of its travel, enhancing the output of the engine, pump or compressor through better utilization of the available cylinder pressure.