![]() ![]() This requires installing a thermocouple on the air cleaner or inlet ducting. In a perfect world, the actual temperature we want to use to correct fuel-system calibration would be the actual carb (or air meter) inlet temperature, which can differ significantly from ambient temperature if a cold-air induction system is not present. To convert ambient temperature (degrees F) to Rankine temperature (degrees R), use: degrees R = degrees F + 459.7. Absolute temperature is commonly referred to as "degrees Rankine" (degrees R). However, for purposes of figuring out absolute air density, we need to express temperature in terms of the absolute air temperature, which uses absolute zero as the base, roughly -459.7 degrees F. system, temperature is measured in degrees Fahrenheit (degrees F). Air density is also inversely related to temperature: Higher temperatures translate to decreased air density, so a reduction in air temperature requires richening the fuel mixture. The ambient temperature is inversely proportional to altitude in other words, as elevation increases, temperature tends to drop. Air temperature is the second most important factor. ![]()
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