Quote:
Originally Posted by fiedlerh
Many years ago I had a job where I had access to all the latest tune up equipment and 4 gas emissions analyzers. On a stock car with a stock cam and an adjustable idle mixture, we set idle screws to the highest vacuum. This got us around 6 to 8% CO readings which was very rich with eye-burning exhaust.
Then we used the factory method as mentioned by Cliff, where you turn in until the rpm drops and then back out a little bit. This got us around 3% CO readings and the engine ran much better and no stinky exhaust. With a tight newly rebuilt engine it would even be happy at 1.5 to 2% CO. What you really want is maximum CO2 readings.
The "max vacuum at idle" method is likely valid with log-style intake manifolds used on old inline engines.
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Eye burning exhaust is lean to me..
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466 Mike Voycey shortblock, 310cfm SD KRE heads, SD "OF 2.0 cam", torker 2
373 gears 3200 Continental Convertor
best et 10.679/127.5/1.533 60ft
308 gears best et 10.76/125.64/1.5471
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