The Influence of Coolant Temperature on Unburned Hydrocarbon Emissions from Spark Ignition Engine 941962
A study has been initiated to understand the influence of coolant temperature on HC emissions employing a dual system cooling the cylinder head independently from the engine block. Especially, we have studied its influence on post-oxidation, fuel absorption-desorption, crevice volumes and fuel-air mixture preparation.
The results show that the cylinder head temperature has more influence on HC emissions than the block temperature. It was also found that mixture preparation, absorption/desorption and crevice volumes with commercial gasoline is greatly improved by the cooling temperature. The post-oxidation process is also reduced for a decrease of the coolant temperature from 90°C to 35°C.
Citation: Guillemot, P., Gatellier, B., and Rouveirolles, P., "The Influence of Coolant Temperature on Unburned Hydrocarbon Emissions from Spark Ignition Engine," SAE Technical Paper 941962, 1994, https://doi.org/10.4271/941962. Download Citation
P. Guillemot, B. Gatellier, P. Rouveirolles
Institut Français du Pétrole
International Fuels & Lubricants Meeting & Exposition
SAE 1994 Transactions: Journal of Fuels and Lubricants-V103-4