I have a carbureted engine with no O2 sensor. I do have an exhaust gas analyzer. The only specs I can find for setting your lambda for 1 expresses CO in %. My analyzer measures in ppm. Does anyone know what ppm of CO I should get at 14.7:1 AFR?
These are the specs I can find but want to know how it translates in ppm:
Tuning with a 5-Gas Analyzer and Wideband Lambda Meter
The use of a portable 5-gas exhaust gas analyzer and/or a wideband sensor based A/F meter can allow a tuner to observe the A/F mixture the engine is getting from its fuel system at any engine operating condition.
A starting point for A/F mixtures for most mild performance engines is:
• Idle: 1.0% to 3.0 % CO or a 14.1-13.4:1;
• Cruise rpm: 1.0% CO or a 14.1:1 with a mild performance engine; or 1.0% - 3.0% CO or a 14.1 – 13.4:1 with high performance cam; and
• Power mixture and acceleration: 6.0% CO or a 12.5:1 for a “normal” engine or high performance engine with improved combustion chamber design such as a Pro Stock or a NASCAR engine; in some cases you may be able to use a slightly leaner power mixture of 4% CO or a 13.0:1.
These are the specs I can find but want to know how it translates in ppm:
Tuning with a 5-Gas Analyzer and Wideband Lambda Meter
The use of a portable 5-gas exhaust gas analyzer and/or a wideband sensor based A/F meter can allow a tuner to observe the A/F mixture the engine is getting from its fuel system at any engine operating condition.
A starting point for A/F mixtures for most mild performance engines is:
• Idle: 1.0% to 3.0 % CO or a 14.1-13.4:1;
• Cruise rpm: 1.0% CO or a 14.1:1 with a mild performance engine; or 1.0% - 3.0% CO or a 14.1 – 13.4:1 with high performance cam; and
• Power mixture and acceleration: 6.0% CO or a 12.5:1 for a “normal” engine or high performance engine with improved combustion chamber design such as a Pro Stock or a NASCAR engine; in some cases you may be able to use a slightly leaner power mixture of 4% CO or a 13.0:1.
