[DeTomaso] Optimal Air Fuel Ratio Question

[Daniel C Jones]

> Does anyone have a table or chart handy showing how many Holley jet sizes you should change per 1000ft of elevation change?
>
> Doug Braun

Do a search on Air Density Ratio Charts. At high altitudes (actually at any
altitude above 0' msl.), the diameter of the main jets varies proportionally
with the fourth root of the air density ratio at a particular altitude
in order to
maintain a constant mixture ratio at that altitude.  For instance, if Holley
used a .100" diameter main jet for a standard (sea level) setting, and your
local density ratio is .8, you should use a .946" diameter main jet in order
to maintain the correct mixture ratio.

Dan Jones