10 Disadvantages of Biofuels


Technical Challenges

Biofuels can be tricky, because they operate differently in cars than regular petroleum-based fuels do.
Biofuels can be tricky, because they operate differently in cars than regular petroleum-based fuels do.
Ryan McVay/Lifesize/Thinkstock

Perhaps the most straightforward of biofuel's drawbacks is the most obvious: It isn't petroleum-based fuel, so it will operate differently in engines designed for petroleum-based fuel.

Corn-based ethanol, for example, has a higher density than gasoline; fuel injectors have to be larger in an ethanol-only engine to match the fuel flow of a comparable gasoline engine. And alcohol fuels (including ethanol) can corrode or damage some of the metal and rubber fittings used in gasoline-powered engines. The conversion from one fuel to the other, in some cases, requires a range of new injectors, gaskets and fuel lines. And once the engine's running, the differences in combustion properties between gasoline and ethanol means that the ethanol-converted engine needs to have its ignition timing adjusted to operate properly [source: Tsuneishi].

Biodiesel doesn't fare much better. Because of the higher-than-petroleum gel point of many biodiesel-producing oils, a biodiesel engine can be difficult -- if not impossible -- to start in cold weather. The problem is even worse for pure vegetable oil, used as fuel in so-called "greasecars." Drivers of vehicles using these fuels often have heating units installed to keep the fuel tank and lines free from gelled fuel, or install dual-fuel systems that flush the engine with petroleum diesel on start-up and shut-down. A number of manufacturers sell components for biodiesel and greasecar conversions, and intrepid tinkerers often find ways to overcome the gelling problem. But the conversions add time and money to the biofuel equation, something that can be off-putting for potential biofuel users.

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Related Articles


  • Alexander, C. et al. "Biofuels and their Impact on Food Prices." Purdue Extension. September 2007. (Jan. 14, 2011)http://www.extension.purdue.edu/extmedia/ID/ID-346-W.pdf
  • Altieri, Miguel A. "Modern Agriculture: Ecological impacts and the possibilities for truly sustainable farming." University of California, Berkeley. July 30, 2000. (Dec. 13, 2010)http://www.cnr.berkeley.edu/~agroeco3/modern_agriculture.html
  • Burpee. "Growing Zone Information." 2010. (Dec. 11, 2010)http://www.burpee.com/gardening/content/gygg/growing-zone-information/growingzoneinfo.html
  • Carey, John et al. "Food vs. Fuel." Bloomberg Businessweek. Feb. 5, 2007. (Nov. 15, 2010)http://www.businessweek.com/magazine/content/07_06/b4020093.htm
  • Golden Fuel Systems. 2007. (Dec. 13, 2010)http://www.goldenfuelsystems.com/index.php
  • Journey to Forever. "Oil Yields and Characteristics." (Nov. 19, 2010)http://journeytoforever.org/biodiesel_yield.html
  • Lau, Michael H. et al. "The Economics of Ethanol from Sweet Sorghum Using the MixAlco Process." Agricultural and Food Policy Center, Texas A&M University. Aug. 11, 2006. (Jan. 14, 2011)http://www.afpc.tamu.edu/pubs/2/446/RR%2006-2.pdf
  • McKenna, Phil. "Measuring Corn Ethanol's Thirst for Water." MIT Technology Review. April 14, 2009. (Nov. 15, 2010)http://www.technologyreview.com/energy/22428/page1/
  • Mellon, Margaret and Jane Rissler. "Environmental Effects of Genetically Modified Food Crops -- Recent Experiences." Union of Concerned Scientists. June 12-13, 2003. (Dec. 13, 2010)http://www.ucsusa.org/food_and_agriculture/science_and_impacts/impacts_genetic_engineering/environmental-effects-of.html
  • Naylor, Rosamond L. et al. "The Ripple Effect: Biofuels, Food Security and the Environment." Environment. November 2007. (Jan. 14, 2011)http://www.environmentmagazine.org/Archives/Back%20Issues/November%202007/Naylor-Nov07-full.html
  • Pimentel, David and Tad W. Patzek. "Ethanol Production Using Corn, Switchgrass, and Wood; Biodiesel Production Using Soybean and Sunflower." Natural Resources Research. March 2005. (Jan. 14, 2011)http://www.springerlink.com/content/r1552355771656v0/
  • Rosen, C.J. and B.P. Horgan. "Preventing Pollution Problems from Lawn and Garden Fertilizers." University of Minnesota. 2009. (Dec. 11, 2010)http://www.extension.umn.edu/distribution/horticulture/dg2923.html
  • Rosenthal, Elisabeth. "Once a Dream Fuel, Palm Oil May Be an Eco-Nightmare." The New York Times. Jan. 31, 2007. (Nov. 16, 2010)http://www.nytimes.com/2007/01/31/business/worldbusiness/31biofuel.html?adxnnl=1&adxnnlx=1290625375-G4EOxMpw99oBdvPcW6DvCw
  • Tsuneishi, Scott. "E85 Vs Conventional Gasoline - Tech Knowledge." Import Tuner. April 2009. (Dec. 13, 2010)http://www.importtuner.com/tech/impp_0904_e85_vs_conventional_gasoline/index.html
  • United States Department of Agriculture. "Adoption of Genetically Engineered Crops in the U.S." July 1, 2010. (Dec. 13, 2010)http://www.ers.usda.gov/Data/BiotechCrops/


Sweet Sorghum: The Sweetest Fuel You'll Ever Taste!

Sweet Sorghum: The Sweetest Fuel You'll Ever Taste!

How much do you know about sweet sorghum? Keep reading to learn about Sweet Sorghum: The Sweetest Fuel You'll Ever Taste!