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The Diesel Cycle

The Diesel Cycle. Robert Amirault Objective: To establish the function, pros and cons and uses of a diesel engine. Gasoline Engine. Burns unleaded refined gasoline Lower compression ratio (8:1 to 12:1) Subject to “knocking” at high compression Mixes the fuel before injection

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The Diesel Cycle

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  1. The Diesel Cycle Robert Amirault Objective: To establish the function, pros and cons and uses of a diesel engine.

  2. Gasoline Engine • Burns unleaded refined gasoline • Lower compression ratio (8:1 to 12:1) • Subject to “knocking” at high compression • Mixes the fuel before injection • Uses spark plugs

  3. Diesel Engine • Burns less refined diesel fuel • High compression ratio (14:1 to 25:1) • Low risk of “knocking” easy to turbo charge and supercharge • Relies only on pressure to ignite fuel • Uses glow plugs (larger engines do not) • Injects the fuel directly into the cylinder

  4. Benefits • More energy is contained in diesel fuel • One gallon of diesel contains 155 MJ • One gallon of gasoline contains 132 MJ • More efficient • Cheaper fuel

  5. Drawbacks • More expensive to manufacture • Noisier • More pollutant • Low acceleration due to high torque • Required to run at lower RPM

  6. The Diesel Cycle • Definition • The diesel cycle is the combustion process of a type of internal combustion engine in which the burning of the fuel is triggered not by a spark plug as in the Otto cycle, but rather by the heat generated in compressing the fuel-air mixture. • Four parts • Intake • Compression • Injection/combustion • Exhaust

  7. The Engine • The dissected engine was a gasoline engine • The spark plug shows that it is not diesel • Diesel engines are most often found in large trucks, boats, trains and anything requiring a lot of power without much speed.

  8. References • http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/diesel.html • http://www.google.ca/search?hl=en&lr=&safe=off&rls=GGGL,GGGL:2005-09,GGGL:en&oi=defmore&defl=en&q=define:Diesel+cycle • http://auto.howstuffworks.com/diesel1.htm

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