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Cost, Effectiveness, and Deployment of Fuel Economy Technologies for Light-Duty Vehicles (2015) / Chapter Skim
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Appendix O: Variable Compression Ratio Engines
Pages 402-403

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From page 402...
... ratio piston consisted of a moveable top that used en- Rotating the eccentric wheels changes the clearance gine oil pressure to extend the piston top for the highest volume at top dead center. FEV has developed a similar compression ratio.
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From page 403...
... tane rating than gasoline, higher compression ratios would At light loads, compression ratios as high as 15:1 are used, be used during operation on E85. As shown, at moderate whereas at maximum loads, the compression ratio is reduced loads, compression ratios about 2 ratios higher are used.
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Key Terms

  • variable compression
  • ratio engine
  • compression ratios
  • dead center
  • cylinder head

  • top dead
  • ratio engines
  • green car
  • car congress
  • eccentric wheels

  • cylinder pressure
  • maximum loads
  • rocker arm
  • clearance volume
  • peak cylinder

  • tank engines
  • cylinder block
  • rocker variable
  • crankshaft bearings
  • ffv engine

  • gear rack
  • piston consisted
  • engine shown
  • ccentric crankshaft
  • limiting peak

  • eccentric piston
  • relief valve
  • extra linkage
  • thereby altering
  • pressure relief


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