HP / Holley Jet Environmental Correction By Bowling
The following computation determines jet size changes for Holley carburetors
based on environmental conditions. The idea is to convert
currently-used Holley jet numbers to a "standard" environment, so that
one can perform future calculations to other environments. For instance,
if I use a 65 Holley jet number at 60 degrees F on a mountaintop, I first determine a new
jet corrected to SAE standard conditions and save this number. Now one can
correct this jet value to any measured environment, like 95 degrees F at
the beach. Great for the track to help maintain consistent metering
throughout the day.
The inputs to this program are barometric pressure (converted to sea-level,
usually the form provided by Weather Services), elevation, humidity,
temperature, and Holley jet number, between 40 and 100.
Remember, Holley jet numbers do not represent twist drill values.