오일의 유동성과 흡기압력 변화에 따른 밸브 스템계의 누설에 관한 실험적 연구

Purpose for the this paper is the leakage characteristics study of the valve stem system in automotive engines. Three factor effecting oil leakage is the power cylinder, engine head system, and the positive crankcase ventilation system. Engine head system is the most difficult variables. Experimental study did in the difference of the cylinder temperature variation , the intake pressure and the revolution of the camshaft. Engine oil for experimental study used PCMO SAE 30 specification.