Browse Publications Technical Papers 2003-01-0546
2003-03-03

Characterization of Combustion Chamber Deposits from a Gasoline Direct Injection SI Engine 2003-01-0546

Combustion chamber deposits (CCDs) from a gasoline direct injection stratified charge SI engine were analysed. The engine was run with two fuels: a typical European base fuel, containing 9.8% MTBE, and a low volatility worst case fuel. The worst case fuel is a standardized European fuel, CEC RF 86-A-96, prone to form deposits. It contains high amounts of aromatics and olefins but no MTBE. The deposits were analyzed in several ways; thermal desorption followed by gravimetric analysis, fast neutron activation analysis and solid-state 13C nuclear magnetic resonance spectroscopy.
Up to 50% of the deposits, formed inside the GDI engine, consist of volatiles. The composition of the deposits is strongly related to the composition of the engine oil.
The fraction of volatiles in the deposits decreased in the order: cylinder head, piston squish surface and piston bowl. The deposits from the piston squish surface contained the highest fraction of oxygen, about 30 %.
The non-volatile part of the deposits was highly oxidized. The organic oxygen in the non-volatile part was found in different types of carbon compounds: oxygenated aliphatics, carboxyls and carbonyls.
The fuels used in this study apparently did not significantly affect the content of oxygen and the volatile organic found in the deposits.

SAE MOBILUS

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

Access SAE MOBILUS »

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

Effect of Engine Operating Parameters on Engine Combustion Chamber Deposits

902108

View Details

TECHNICAL PAPER

Thermochemical Behaviour of Producer Gas from Gasification of Lignocellulosic Biomass in SI Engines

2001-01-3586

View Details

JOURNAL ARTICLE

A Transport Equation Residual Model Incorporating Refined G-Equation and Detailed Chemical Kinetics Combustion Models

2008-01-2391

View Details

X