1956-01-01

Nitrogen Oxides, Combustion, and Engine Deposits 560068

REACTIONS of unsaturated fuel constituents with oxides of nitrogen, formed during combustion, play an important part in formation of engine deposits. Engine varnish, the organic binder in engine deposits, results in large part from reactions of nitrogen dioxide with gasoline constituents.
Simplified kinetic studies indicate that nitrogen fixation and amounts of nitric oxide present in exhaust gases could be predicted. Tests have demonstrated that only under conditions leading to appreciable nitrogen fixation does heavy engine varnishing occur.
Because commercial engine oils are fairly resistant to oxidation, it is likely that current deposit problems result from the nature of fuel and prevailing operating conditions. Under average driving, low-temperature operation, lean mixtures with consequent high nitrogen oxide content contribute much to varnish formation.

SAE MOBILUS

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

Access SAE MOBILUS »

Members save up to 18% 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

Misfiring Control in Current Cycle at Engine Start Employing Ion Sensing Technology

2009-01-2713

View Details

TECHNICAL PAPER

Characteristics of Intermediate Products Generated During Diesel Combustion by Means of Total Gas Sampling

2004-01-2923

View Details

TECHNICAL PAPER

Performance and Emissions Achievements with an Uncooled Heavy-Duty, Single-Cylinder Diesel Engine

890144

View Details

X