U
ser
'
s
G
Uide
— 27
To translate a fuel correction index to a new jet number, recall
your baseline was recorded with #78 jets, which according to
the Holley Jet Chart (see
Appendix B
),
have a flow of 645 cubic
centimeters per minute.
Recall your fuel correction index is
about 89%.
KeysTroKe
disPlay
6. Calculate a new flow requirement:
574.05*
* Using the chart in Appendix B, the closest flow number to 574 is the
566 cubic centimeters per minute flow which corresponds to a #75 jet,
which would be a change of three jet numbers down (in this example,
Density Altitude has gone up, so it stands to reason that a leaner jet
number may be required). A conservative change, however, would be
to go from the #78 to the #76, which has a flow of 587 cubic centime-
ters per minute.
Calculating Water Vapor Content
Using a different set of track and weather conditions at Top Gun
Raceway, let’s calculate water vapor content (water vapor pres-
sure, saturation water vapor pressure and dew point).
The track’s Elevation is about 3,963 feet above sea level. The
current local measured weather conditions are 73° F, absolute
Pressure of 25.88 inHg and 14% relative humidity at 10 a.m.
KeysTroKe
disPlay
0.
1. Enter current local measured weather conditions:
TeMP
73. °f
(Pressure)
P-abs
25.88
inHG
rH%
14.
%
(cont'd)
UG8703E-B-inside.indd 27
3/3/2010 3:03:58 PM
Summary of Contents for Hot Rod Calc
Page 1: ...Model 8703 ...
