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Re: CIS Cheap Power

In a message dated 97-05-12 21:59:37 EDT, you write:

<< Now, wouldn't the mixture get _lean_ if you shove more air into the
 engine while keeping the fuel flow constant?
 Luis Marques
 '87 4kcsq
 __________ >>
No, not exactly.  Fuel flow is NOT a constant.  Atmospheric pressure is on
one side of the flap, vacuum on the other.  Po (Atmospheric pressure) is a
constant, the flap raises (richening mixture - increasing fuel flow) as
vacuum increases the flow of Po by the flap.  Fuel flow is a variable in the
CIS equation, not a constant.  Po, cone pitch and dia are the constants, not
fuel flow.  I suppose, once you reach the limit of fuel flow you could make
that argument, but that's a pretty high threshold, and the rest of the time,
rich is the ticket.