Intake ports for a diesel engine

An apparatus that controls a swirl ratio in a diesel engine for a motor vehicle, the apparatus comprising:

• a first intake port that directs a first airflow into a combustion chamber, the first airflow being a tangential airflow in a first direction;
• and
• a second intake port that directs a second airflow into the combustion chamber, the second airflow being a tangential airflow in a second direction, the second direction being an opposing direction to the first direction,
• the first and second intake ports being arranged to direct the first airflow and the second airflow such that a desired swirl ratio is achieved in the combustion chamber.

A diesel engine for a motor vehicle, the diesel engine comprising:

• a first intake port that directs a first airflow into a combustion chamber, the first intake port including a first swirl valve that controls a flowrate of the first airflow from the first intake port into the combustion chamber, the first airflow being a tangential airflow in a first direction;
• and
• a second intake port that directs a second airflow into the combustion chamber, the second intake port including a second swirl valve that controls a flow rate of the second airflow from the second intake port into the combustion chamber, the second airflow being a tangential airflow in a second direction,
• the first and second intake ports being arranged to direct the first airflow and the second airflow such that a desired swirl ratio is achieved in the combustion chamber.