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Posted by gmharris [71.105.178.157] on Wednesday, August 31, 2011 at 15:41:27 :
In Reply to: Re: Efficiency in vehicles NOT at full throttle. posted by mannyc [68.165.89.2] on Wednesday, August 31, 2011 at 13:58:36 :
Lean fuel/air mixtures (idle and light loads) require more time to burn than rich mixtures.
The vacuum canister advances ignition timing by reacting to the higher vacuum associated with idle and light load situations.
Engines just run better if the fuel air mixture is given the proper amount of time to burn before (and sometimes after) the piston reaches Top Dead Center.
Here is a good article on another forum about vacuum advance and timing. It is about the 5th entry down.
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