This is a link to some excellent graphs depicting the relationship of CO ,
CO2 and Fuel/Air ratios for good exhaust emissions.
You should be able to extrapolate what you need for your new tester.
The principal is that with the "ideal" fuel air ratio of 14.7/1 , the CO
will have reached its lowest point.a (ideally . 5 %) however it will stay
flat as you continue to lean, so you would back up to slightly raise the
reading from its lowest point. This will leave the carbs slightly on the
rich side, preferred to an unknown degree of lean condition which could burn
the valves,etc
http://www.autoshop101.com/forms/h56.pdf
Dallas Congleton
1967 BJ8
1953 MGTD
----- Original Message -----
From: "M Fawcett" <m.fawcett@verizon.net>
To: <healeys@autox.team.net>
Sent: Thursday, January 05, 2006 4:59 PM
Subject: Gunson's Gastester
> Hi All,
> My wife bought me a Gunson's Gastester for Christmas so thought I'd give
it a try. When I read the booklet that comes with it, it states that the CO
level should be set according to the manufacturers requirements. Does anyone
know what the percent of CO should be for a 1960 Big Healey. The booklet
suggests that the range is from .5% to 4.5%. This seems a little wide and
I'd like to narrow it down. Any help is appreciated.
>
> Mark Fawcett
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