The purpose of this study is to verify the effects of a port throttling and 1/4 diagonal port masking of an intake port of an SI engine. The fuel consumption rate increased with port throttling and masking under all operating conditions. However, the rapid combustion effect was increased in all operating conditions. It is consider that this is more influential on the suction resistance than the combustion efficiency increase through intake control. In addition, the increase in the burning velocity indicates that the flame propagation speed is increased by increasing the swirl moment during combustion.

ABSTRACT
 1. 서론
 2. 실험장치 및 방법
 3. 결과 및 고찰
  3.1 희박연소한계 변화
  3.2 연료소비율
  3.3 점화시기 및 배기가스 온도
  3.4 질소산화물 배출량
 4. 결론
 References

• 김선규(Department of Mechanical Engineering, Seoul National University of Science and Technology) | Sun-Gue Kim Corresponding Author
• 신현초(Department of Automobile Engineering, Jeju Campus of Korea Polytechnic) | Hyun-Cho Shin