Introduction to combustion chamber deposits (CCD)
Conference
·
OSTI ID:370712
- Exxon Research and Engineering Company, Annandale, NJ (United States)
CCDs have existed since the inception of internal combustion engines in automobiles. Their initial importance to gasoline performance arose from their influence on an engine`s Octane Requirement Increase (ORI). The nature of CCDs have changed considerably over the past 40 years. In the past, CCDs had significant quantities of metal oxides derived from components in the lubricant and from lead antiknock additives in the fuel. In more recent times with tighter engine hardware, most of the CCD is derived from components in the fuel. In addition to ORI, current concern about CCD stems from their potential contribution to exhaust emissions and their role in combustion chamber deposit interference (CCDI). The latter is believed to cause mechanical interference resulting in an audible rapping sound known as CCDI. As both engine and fuel technology continue to evolve it is especially important to quantify the sources of CCD and to understand the basics about their formation/removal mechanisms and their impacts on exhaust emissions.
- OSTI ID:
- 370712
- Report Number(s):
- CONF-960376--
- Country of Publication:
- United States
- Language:
- English
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