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Cost, Effectiveness, and Deployment of Fuel Economy Technologies for Light-Duty Vehicles (2015) / Chapter Skim
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Appendix G: Friction Reduction in Downsized Engines
Pages 383-383

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From page 383...
... Consequently, a The effect of 50 percent downsizing can be calculated by 25 percent reduction in friction will provide a 5.6 percent comparing the baseline conditions shown previously for both reduction in fuel consumption, as discussed in the SI Ef- the naturally aspirated and downsized, high BMEP engines ficiency Fundamentals section of Chapter 2. as follows: For a 50 percent downsized, high BMEP engine, a BMEP Naturally Aspirated Engine: BSFC = 1.289 ISFC level twice that of the naturally aspirated engine would be Downsized Engine: BSFC = 1.145 ISFC required for the same operating condition of the vehicle.
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Key Terms

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  • aspirated engine
  • cycle operating
  • downsized engine
  • percent downsized

  • following improvement
  • typical ftp
  • ftp cycle
  • friction power
  • baseline friction

  • operating condition
  • specific fuel
  • typical baseline
  • shown previously
  • reduction follows

  • percent downsizing
  • engine displacement
  • bmep engine
  • friction reduction
  • friction relative

  • effective pressure
  • ficiency fundamentals
  • level twice
  • baseline conditions
  • bmep engines

  • typical federal
  • nearly twice
  • using equation
  • engines ficiency
  • constant indicated


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