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Engine efficiency indicator

  • US 3,942,364 A
  • Filed: 12/09/1974
  • Issued: 03/09/1976
  • Est. Priority Date: 12/09/1974
  • Status: Expired due to Term
First Claim
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1. In combination with a speed rate indicator means for a vehicle having a throttle and intake manifold and incorporating a first visual indicator for said means, an engine efficiency indicator means for revealing within limits the operating efficiency of the vehicle internal combustion engine, said engine efficiency indicator means being pivotally mounted with respect to said speed rate indicator means, said engine efficiency indicator means including a second visual indicator normally pivoted a select degree by movement of said first visual indicator regardless of the vehicle speed when the operating engine is within a predetermined efficiently functioning range, pressure sensing means responsive to the intake manifold vacuum of the engine for sensing changes in the magnitude of its vacuum normally brought about by various settings of the throttle, shifter means operatively associated with said speed rate indicator means and normally maintaining said second visual indicator pivoted to the select degree with respect to said first visual indicator, said shifter means being responsive to the said pressure sensing means and capable of displacing said second visual indicator from its normally fixed position with respect to said first visual indicator for displaying when the operating engine departs from the limits of its predetermined efficiently operating range.

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