Variation of Both Symmetric and Asymmetric Valve Events on a 4-Valve SI Engine and the Effects on Emissions and Fuel Economy 2000-01-1222
Mechanisms exist to vary valve lift, duration and phasing either simultaneously or individually but it remains a challenge to find the optimum settings. An experimental investigation involving a statistical approach has been applied to a 4-litre, 90° vee-8, 4-valve engine in which intake valve lift, duration and phasing were chosen as variables along with exhaust valve phasing. The intake valves were operated symmetrically for the first phase of testing, but subsequently asymmetric operation was also investigated. The results indicated possible strategies that could be applied to reduce emissions.
Citation: Ghauri, A., Richardson, S., and Nightingale, C., "Variation of Both Symmetric and Asymmetric Valve Events on a 4-Valve SI Engine and the Effects on Emissions and Fuel Economy," SAE Technical Paper 2000-01-1222, 2000, https://doi.org/10.4271/2000-01-1222. Download Citation
Ahmar Ghauri, Stephen H. Richardson, Chris J. E. Nightingale
Jaguar Cars Ltd., University College London
SAE 2000 World Congress
Variable Valve Actuation 2000-SP-1523, Variable Valvetrain System Technology-PT-122