Mr. Gasket 8703 Hot Rod Calculator User Manual
Page 28
26 —
H
ot
r
od
C
alC
™
KeysTroKe
disPlay
0.
3. Enter current weather conditions:
TeMP 60. °f
(Pressure)
P-abs 24.72
inHG
rH% 39.
%
4. Calculate ADI and Density Altitude:
eleV 0.
adi 81.94
%
d-alT 6662.18
f
**
Record the calculated ADI of 81.94% and Density Altitude of 6,662 feet
in your log.
5. Calculate a fuel correction index, which is simply the current
ADI of 81.94, divided by the baseline ADI of 92.038, then
multiply by 100:
81.94
0.8902844
89.028445*
* The fuel correction index is about 89%, indicating air density is about
89% of the air density from which you baselined your jet numbers. In
other words, the new air density has gone down about 11% from your
baseline air density calculation. Some experts say that as a general
rule, a change of +/- 4% or more in air density is enough to consider a
jetting change.
** Also, notice that the Density Altitude at the new track location, about
6,662 feet, is much higher than the previous track’s Density Altitude of
about 2,813. Typically, as Density Altitude goes up, you may require
less fuel whereas if Density Altitude goes down, you may require more
fuel.
(cont'd)
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