Effects of Combustion-Chamber Deposits on Octane Requirement and Engine Power Output

1951 ◽  
Author(s):  
J.B. Duckworth
Keyword(s):  
Combustion Chamber ◽  
Power Output ◽  
Combustion Chamber Deposits ◽  
Engine Power

Design and Development of a New Landfill/Biogas Engine Oil for Modern, High BMEP Natural Gas Engines

2011 ◽  
Author(s):  
John D. Palazzotto ◽  
Joseph Timar ◽  
Alan T. Beckman
Keyword(s):  
Combustion Chamber ◽  
New Product Development ◽  
Power Output ◽  
Landfill Gas ◽  
Combustion Process ◽  
Development Project ◽  
Engine Oil ◽  
Combustion Dynamics ◽  
Brake Mean Effective Pressure ◽  
Combustion Chamber Deposits

The use of higher brake mean effective pressure (BMEP) engines in landfill or alternative gas applications has increased dramatically in the past few years. Operators are using these engines due to their ability to provide lower emissions coupled with improved economics for the end user due to the higher density or power output capability compared to an engine of similar size and displacement. Landfill gas (LFG) quality can vary greatly as well as the contaminant level due to the composition of the landfill. This environment poses unique challenges to both the engine and the engine oil, including shorter oil drain intervals, corrosive attack of engine components, with increased piston and combustion chamber deposits, to name but a few. Maintaining longer oil drain intervals minimizes unscheduled oil drains which can decrease the overall cost of the landfill operation. High BMEP engines provide higher power output but at the cost of increased maintenance in severe fuel applications. Excessive piston crown and combustion chamber deposits from landfill gas impurities can have a deleterious effect on engine emissions, which may lead to the inability to meet local emissions regulations. Engine lubricants must provide adequate oil life as well as minimizing deposit related issues that may negatively impact regular scheduled maintenance cycles, thus reducing engine downtime and increasing revenues. Traditionally, the approach has been that oils formulated for landfill applications used excess base reserve to sufficiently neutralize the acids being formed during the combustion process. Unfortunately, this approach increases the sulfated ash content of the lubricant which lends itself to increased ash deposits and negatively impacts the combustion dynamics of these high BMEP engines, which are sensitive to ash deposition. Based on requests for a longer life lubricant without compromising deposit control characteristics in serve landfill applications, a new product development project was specifically targeted for late model, high BMEP engines, which are prone to detonation and sensitive to ash related deposits. This paper presents the development bench testing, and proof of performance field evaluations of a new generation, low ash landfill gas engine oil.

Design and Development of a New Landfill/Biogas Engine Oil for Modern, High BMEP Natural Gas Engines

2012 ◽  
Vol 134 (8) ◽  
Author(s):  
John D. Palazzotto ◽  
Joseph Timar ◽  
Alan T. Beckman
Keyword(s):  
Combustion Chamber ◽  
New Product Development ◽  
Power Output ◽  
Landfill Gas ◽  
Combustion Process ◽  
Development Project ◽  
Engine Oil ◽  
Combustion Dynamics ◽  
Brake Mean Effective Pressure ◽  
Combustion Chamber Deposits

The use of higher brake mean effective pressure (BMEP) engines in landfill or alternative gas applications has dramatically increased in the past few years. Operators are using these engines due to their ability to provide lower emissions, coupled with improved economics for the end user due to the higher density or power output capability compared to an engine of similar size and displacement. Landfill gas (LFG) quality can vary greatly, along with the contaminant level due to the composition of the landfill. This environment poses unique challenges to both the engine and the engine oil, including shorter oil drain intervals, corrosive attack of engine components, with increased piston and combustion chamber deposits, to name but a few. Maintaining longer oil drain intervals minimizes unscheduled oil drains, which can decrease the overall cost of the landfill operation. High BMEP engines provide higher power output, however,at the cost of increased maintenance in severe fuel applications. Excessive piston crown and combustion chamber deposits from landfill gas impurities can have a deleterious effect on engine emissions, which may lead to the inability to meet local emissions regulations. Engine lubricants must provide adequate oil life along with minimizing deposit related issues that may negatively impact regular scheduled maintenance cycles, thus reducing engine downtime and increasing revenues. Traditionally, the approach has been that oils formulated for landfill applications used excess base reserve to sufficiently neutralize the acids being formed during the combustion process. Unfortunately, this approach increases the sulfated ash content of the lubricant, which lends itself to increased ash deposits and negatively impacts the combustion dynamics of these high BMEP engines, which are sensitive to ash deposition. Based upon requests for a longer life lubricant without compromising deposit control characteristics to serve landfill applications, a new product development project was specifically targeted for late model, high BMEP engines, which are prone to detonation and sensitive to ash related deposits. This paper presents the development bench testing, and proof of performance field evaluations of a new generation, low ash landfill gas engine oil.

Abnormal Combustion Induced by Combustion Chamber Deposits Derived from Engine Oil Additives in a Spark-Ignited Engine

2014 ◽  
Vol 8 (1) ◽  
pp. 200-205 ◽  
Author(s):  
Kazushi Tamura ◽  
Toshimasa Utaka ◽  
Hideki Kamano ◽  
Norikuni Hayakawa ◽  
Tomomi Miyasaka ◽  
...  
Keyword(s):  
Combustion Chamber ◽  
Engine Oil ◽  
Oil Additives ◽  
Combustion Chamber Deposits

Performance Characteristics of a Diesel Engine Fueled With Avio-Kerosene

2003 ◽  
Author(s):  
Giancarlo Chiatti ◽  
Ornella Chiavola
Keyword(s):  
Diesel Engine ◽  
Combustion Chamber ◽  
Gas Turbine ◽  
Power Output ◽  
Pressure Rise ◽  
Experimental Tests ◽  
Diesel Oil ◽  
Exhaust Gas ◽  
Gas Temperature ◽  
Exhaust Gas Temperature

A comparative series of experimental tests has been performed on a 4-stroke multi cylinder indirect injection diesel engine fueled with diesel oil, pure gas-turbine fuel and gas-turbine fuel with additives. The engine has been equipped aimed at monitoring both the overall performances and the variation with time of the pressure in the pre-combustion chamber. Some key parameters have been investigated at different engine speeds and loads (ignition delay, pressure rise in the pre-combustion chamber, power output, specific fuel consumption, exhaust gas temperature) and discussed results are presented.

Combustion Chamber Deposits and PAH Formation in SI Engines Fueled by Producer Gas from Biomass Gasification

2003 ◽  
Author(s):  
Jesper Ahrenfeldt ◽  
Ulrik Henriksen ◽  
Jesper Schramm ◽  
Torben K. Jensen ◽  
Helge Egsgaard
Keyword(s):  
Combustion Chamber ◽  
Biomass Gasification ◽  
Producer Gas ◽  
Si Engines ◽  
Combustion Chamber Deposits
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