<VV> Leaning Out the Midrange...Continued

[BBRT]

Does it say really bad things?  LOL!

Chuck S
BBRT
----- Original Message ----- 
From: <Mikeamauro at aol.com>
To: <virtualvairs at corvair.org>; <fastvair at yahoogroups.com>
Sent: Tuesday, January 17, 2006 11:31 PM
Subject: <VV> Leaning Out the Midrange...Continued


> Greetings and salutations:
> I've been on a mission to improve the efficiency of my 67,110 coupe 
> (history
> detailed below in previous post). The vehicle gets  consistently poor fuel
> mileage: around 16 mpg, combined Hwy/City.Since the  last post, at cursing 
> speed
> (55mph & steady) A/F ratio of the  dual exhaust vehicle has been tested 
> with
> an Innovate brand broad band device.  The results show the following A/F
> results: Left Bank = 12.8, Right Bank = 12.1.  Both readings are a few 
> clicks rich
> from the ideal stoichiometric fuel mixture  of 14.7. As the main jets are
> already .049s, and the main jet size has little  (if any) effect on 
> midrange A/F
> ratio, my next step is to open up the air bleeds  on top of the venturi
> clusters. The bleeds will be adjusted  upwards using numbered drill bits, 
> and will be
> opened up just one or two  numbers at a time (between retesting A/F 
> ratio).
>
> Observations or suggestions?
>
> Mike Mauro
>
> FROM  PREVIOUS POST: I've installed Ray Sedman's F/A O2 sensor readout 
> system
> on  my 67 110 coupe. Readings obtained indicate the F/A mixture is
> consistently rich (11-to-12-to-1) in the cruising range. I've gone as lean 
> as  I dare
> with the main jets (.049s), but jetting does not appear to  significantly
> affect midrange mixture. The purpose of my work is to improve  fuel 
> economy (and
> yes, all is well--mechanically--with the engine). My next  step is to 
> purchase a
> broadband F/A diagnostics device (likely with additional  RPM input) and
> begin experimenting with the internal working of the carbs in  an effort 
> to lean
> out the midrange. QUESTION: has anyone out there already  ventured down 
> this
> path? What area in the stock carbs is the most likely place  to start in 
> working
> on the midrange F/A mixture?
> Thanks in advance for any information provided.
>
> Mike Mauro
> 67 110 PG Coupe, with Factory Air
>
>
>
>


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