Feasibility of Using an Ethanol/87 Gasoline Mixture in Place of High Octane Fuel in Automotive Internal Combustion Engines Class Project for: F SC 431.

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Presentation transcript:

Feasibility of Using an Ethanol/87 Gasoline Mixture in Place of High Octane Fuel in Automotive Internal Combustion Engines Class Project for: F SC 431 Dr. Randy Vander Wal March 6 th 2015 By Dylan Humenik

Internal Combustion Engines Gasoline Engine Air and fuel mixture compressed Spark plug ignites mixture Combustion of fuel pushes piston back down Diesel Engine No spark plug Heat of compression alone ignites fuel Compression Engine Knock can Occur in Gasoline Engine Heat of compression ignites fuel before spark plug fires Quickly leads to engine damage Diagram of cylinder in gasoline engine 1

Octane Rating Definition Fuel’s ability to resist engine knocking Compared to volumetric mixture of iso- octane and n-heptane Example 87 gasoline from pump should have the same octane rating as 87% iso- octane and 13% heptane. Measurement Done experimentally Rating Scales Research Octane Number (RON) Motor Octane Number (MON) Anti-Knock Index (AKI) or (R+M)/2 Pure iso-octane = 100; Pure n-heptane = 0 Iso-octane (2,2,4-Trimethylpentane) C 8 H 18 Heptane (n-Heptane) C 7 H 16 2

Ethanol Properties RON of 108.6; MON of 89.7; AKI of Produced by sugar fermentation; sources: Polysaccharidic: corn, sugarcane Cellulosic: switchgrass, wood Used in alcoholic beverages Used as fuel in transportation industry As a Fuel… Advantages Renewable Clean burning Disadvantages Uses food/land supply Less energy content Ethanol C 2 H 5 OH 3

Is Ethanol a Viable Octane Enhancer? Analysis Using E85… 93 octane = x*87 + y*95 Octane Rating (AKI)87 Gasoline (gallons)E85 (gallons) *abbreviated version of slide. See YouTube presentation or PowerPoint Format for full version.YouTube presentation

Conclusion Yes, technically ethanol can be used with standard gasoline to increase octane rating. However, other issues exist that must be considered, including: Advantages Costs less than higher grade octane gasoline Disadvantages Less power output Rubber seals in engine break down with ethanol exposure over time Increased engine wear, reduced engine lifespan Ethanol absorbs water from the air over time – bad for engine What will happen? First few times, probably nothing. After that, engine lifespan will start to drop. Is it worth it? No. 5