O2-sensor on carb (sorry) engine - Slant 6

[tom cloud]

>     I threw out a question last week on EFI for the slant 6.

        [ snip ]

>     Secondly - it's really too expensive to invest $1500 in an aftermarket 
>     system.

        [ snip ]

>     I understand that the fuel-air mixture for example at cruising speeds 
>     should be 14,7:1. I want to get my carb as close to this as possible. 
>     My idea is to install an O2-sensor and thus benefit from it's readings 
>     to optimize the carb.
>     
>     What is the actual electrical output from an O2-sensor (mV, mA, ohm)? 
>     I would like to connect it to a meter placed at the instrument panel; 
>     giving me the best possibility to adjust the carb.
>     
>     Any help or advice is greatly appreciated.
>     
>     
>     Mike Olsson, Stockholm, Sweden.

Mike,

  1 - doubtful you'll get a carb to be stoich very often or for very long.
They don't seem to lend themselves to that kind of adjustment or stability.

  2 - O2 sensor: app. 0 to 1 volt, with ~.5 v = stoich.  I attached a $15
(US) panel meter I got from Hosfelt Electronics to mine and currently
run it off a 9 volt battery (have to change it about every 6 months
as it runs continuously).  It is handy for tune up and interesting to
watch (sorta like watchin' grass grow :-)

  3 - I put the lo-end Holley 670 cfm ProJection on my 302 cid Bronco.
Am reasonably pleased, and it offers EGO feedback (haven't added that
yet).  Another point that makes it interesting to me is that it is
a building block I can work from as I 'perfect' my own efi system
(i.e. I can start another control unit, using the Holley TB, and always
fall back to the Holley controller while I'm experimenting).  It's not
perfect, but it was a distinct improvement over carbs!  The 670 cfm
may be a little much for you, but they offer lower cfm's.


Tom Cloud <cloud at peaches.ph.utexas.edu>