US PATENT SUBCLASS 123 / 406.72
.~.~ Increasing vacuum retards spark timing

Current as of: June, 1999
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123 /   HD   INTERNAL-COMBUSTION ENGINES

406.11  DF  SPARK IGNITION TIMING CONTROL {5}
406.67  DF  .~ Vacuum timing control {5}
406.72.~.~ Increasing vacuum retards spark timing

DEFINITION

Classification: 123/406.72

Increasing vacuum retards spark timing:

(under subclass 406.67) Subject matter wherein an increase in the force provided by the gas at less than atmospheric pressure (i.e., a decrease in the pressure of the gas) causes a delay in occurrence of the short pulse or flow of electric current which arcs across the pair of electrodes in the combustion chamber during a combustion cycle.