Computech Systems RaceAir Pro - Injection

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Use the following chart as an aid in determining nozzle diameter for various nozzle types.
Important: If the fuel system has a fuel pump loop with
a bypass jet or a second fixed main bypass jet circuit,
that orifice size must be included in the total nozzle
area calculations in order to produce an accurate main
bypass jet prediction.
When the setup is completed, the computer will
remember the total nozzle area for future calculations.
Record the calculated total nozzle area with other fuel
system information for future reference. When using
the Select Jet program, always check that the Area=
number matches the recorded number.
This program and the Fuel Injection, High Speed
Bypass Adjust program use the same total nozzle
area number from computer memory.
Press the SAMPLE key and allow the weather analyzer
to stabilize on the = Sampled Wthr = screen. Press
TUNE-UP then Jetting Menu then select Injection to
start this program.
Setup Display Example:
== Calc Area == (Nozzle area setup routine)
# Orifices? 8 (Enter number of nozzles of this size)
Diameter? 0.052 (Enter nozzle diameter in inches)
More? Yes (Press ENTER to input more nozzles, NO to stop)
# Orifices? 2 (Enter number of nozzles of this size)
Diameter? 0.020 (Enter nozzle diameter in inches)
More? No (Press NO to stop)
== Total Area == (Total nozzle area screen)
Area= 0.017618 (Total nozzle area in square inches, RECORD this)
Orifices= 10 (Number of nozzles)
Equiv Dia= 0.150 (Single orifice diameter equivalent in inches)
(Setup complete, press ENTER to continue)
Injection Display Example:
Approx
Crower/
Diameter
Kinsler
Hilborn
Enderle
0.016
E-165
4
16
0.017
F-200
5
17
0.020
G-240
6
20
0.022
H-280
7
21
0.023
J-320
8
22
0.024
K-360
9
24
0.025
L-390
*
25
0.026
M-410
10
26
0.028
N-470
*
28
0.029
P-510
12
29
0.030
P-550
14
31
0.032
R-620
16
32
0.034
S-710
18
33
0.035
T-740
*
35
0.036
T-792
20
*
0.036
U-800
*
36
0.037
V-840
22
37
0.038
W-880
24
38
0.039
X-930
27
39