During valve lead
During valve open
During valve lag
During valve overlap
Leaded petrol
Unleaded petrol
High speed diesel
Low speed diesel
NOX N2 + CO2 Co
HC H2O + CO2 O2
CO H2O + CO O2
C CO2 O2
Exhaust gas recirculation
Crank case ventilation
Positive crank case ventilation
Catalytic convention
Engine vacuum controlled valve
Vacuum regulated valve
Linear electronic controlled valve
Solenoid controlled valve