Browse Publications Technical Papers 941962
1994-10-01

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.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Preview Document Add to Cart
Members save up to 16% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
TECHNICAL PAPER

The Influence of Mixture Preparation on the HC Concentration Histories from a S.I. Engine Running Under Steady-State Conditions

972981

View Details

TECHNICAL PAPER

How Cylinder Cooling and Liner Temperature Profiles Affect NO Emissions: A Device for R&D

2016-01-0983

View Details

TECHNICAL PAPER

Discussion of the Role of Fuel-Oil Diffusion in the Hydrocarbon Emissions from a Small Engine

2008-32-0014

View Details

X