This is why a wideband air fuel ratio gauge is such a must-have for carburetor tuners. Unlike a narrowband air fuel ratio gauge, the wideband air/fuel ratio
Tuning by ear or with a vacuum port are effective ways to determine running condition, but don't actually read the air-fuel ratio. AFR gauges use an O2 sensor, just like modern cars, to provide an
Drag Racing. For bracket racers, air density changes indicate an amount to adjust the engine in order to reproduce a target ET. For class racing, compensating for air density changes can affect the maximum power. Without maintaining an optimal air/fuel ratio, engine performance can be unpredictable.
12391 posts · Joined 2006. #4 · Nov 7, 2008. depending on how technical you want to get, you need a mass ratio of at most 14.7 to one. I know that is the figure for a gas motor, but it is also a decent target for a diesel if you want it to be CLEAN. if you want it to be a little hazy you could go to about 12 to 1.
Power output is a function of air-fuel ratio and ignition advance. Air- fuel ratio and ignition advance will also influence EGT and knock count. For an engine to be thoroughly calibrated or “tuned”, its efficiency should be optimized at all engine speeds. The A/F and ignition timing settings that deliver the maximum torque at a specific RPM
Batch fire engines typically idle best in the mid 13’s, so if you’re leaner than that, put in some more fuel and see if that stabilizes the idle. You’ll need to make sure the air/fuel ratio is maintained during cold start. If your idle hunts when the engine is cold, but stabilizes when it warms up, try more warm up enrichment.
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how to tune air fuel ratio
