SINPAR Combination Octane Rating Unit provide the complete solutions for fuel octane tests, also referred to as the "engine knock test", measure gasoline characteristics related to engine knocking, by Research Method(ASTM D2699 RON) and Motor Method(ASTM D2700 MON). The unit is the same as Waukesha CFR engines, equipped with a heavy duty CFR type crankcase, variable compression cylinder, carburetor with adjustable fuel to air ratio, and knock measurement octane testing equipment.