> From: Steve Nabors [mailto:topdown@eudoramail.com]
> Sent: May 29, 2001 10:05 PM
>
> Anyone out there use one of the following oxygen sensor
> and display setups on the following hotlink
>
> http://www.racerpartswholesale.com/afratio.htm
>
> or homebake one of their own with good result on an LBC?
There a some people using these devices, mostly to assist in tuning the
mixture in different situations (something not easy to do with the more
conventional mixture adjustment methods unless you have a dyno or at least a
rolling road). Note that on most modern cars, the O2 sensors form part of
the engine management system.
I think the difficult part for our cars is locating the O2 sensor in a good
place. It's not easy to weld cast iron. If you use a steel header it becomes
easier.
I am in the process of setting up a A/F ratio gauge in my TR6. I bought a 10
segment LED A/F gauge from Jegs ($30 US) which will fit nicely into the dash
-- it's the same size as the regular TR6 gauges. My solution for fitting an
O2 sensor is to have two O2 sensor ports added to a stock cast iron exhaust
manifold. That way I can monitor each carb's mixture individually as the
location of the ports is such that carbs' exhaust streams are still unmixed.
I have a switch to choose which O2 sensor the gauge displays (only one
sensor's display is supported at any time). I am waiting to get the manifold
back from the ceramic coating place I dropped it off with. After that I
should be able to put the whole thing together and see how it works.
There is lots of info on the web about making up your own A/F meter using a
cheap IC and some LEDs. Search for "air fuel ratio" and "oxygen sensor" and
you should get some hits.
Peter Zaborski CF58310UO
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