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You may never need to change a jet or needle
position again. |
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 MULTI-RANGE
VARI FLOW, a new twist on carburetion. Life with carburetors just got easier.
The twist of a dial, even while driving, tunes multiple carbs from 1/8 to wide open
throttle.The MULTI-RANGE VARI FLOW model
provides the fuel flow curves shown below, simply by changing air jet tube fittings. The
MULTI-RANGE
VARI FLOW will keep you tuned for up to a 9000 foot (2750 meter) elevation change.
With the "stacked" compensation curves shown in the right graph, you get
9000 foot compensation in nine steps. Installation in about an hour. |
| Part # |
Description |
| #58-100 |
Multi-Range Vari
Flow |
| #58-100-8 |
Multi-Range Vari
Flow Installers Kit (8 units with all fittings) |
| #58-100-PZ |
Multi-Range Vari
Flow for Phazer |
| #58-222 |
One way valve
& T fitting for Multi-Range Vari Flow Vent Lines |
| #58-223 |
Filter for Air
Inlet on Vari Flow |
| #58-225 |
Update Air Jet
Kit for Vari Flow |
#58-226
|
Multi-Range Vari
Flow (Body Only)
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TUNING
WITH THE MULTI-RANGE VARI FLOW |
| The top chart below gives required percentage
jetting reduction vs. altitude and temperature with base conditions of -40 and sea level.
The chart is also fairly accurate if used for changes in altitude or
temperature. For instance, if the carbs are jetted for 6000 feet, then the required
reduction at 12000 feet would be read at the 6000 foot row. The bottom chart gives
approximate percentage jetting reduction with the MULTI-RANGE VARI FLOW at knob
positions "RICH" and "4" with different air jet combinations
(alum&brass means use both Aluminum and Brass outlet jets in series with about 1"
spacing between). As shown, the Copper outlet jet and Aluminum inlet jet are simply
tubing connectors and are essentially the same as having tubing with no jet. The
inlet jets (1/2" i.d. tubing) and outlet jets (1/4" i.d. tubing) may be
installed anywhere in their tubing. Remember your A, B, C's (Aluminum,
Brass, Copper), A being the least aggressive, B the middle, C
the most aggressive. Use the least aggressive range possible for the best accuracy in
jetting. |
REQUIRED JETTING REDUCTION vs. ALT. AND TEMP.
ALTITUDE |
TEMPERATURE |
FEET |
METERS |
-40F(-40C) |
-20F(-29C) |
0F(-18C) |
20F(-7C) |
40F(4C) |
0 |
0 |
0% |
2% |
4% |
6% |
8% |
1000 |
300 |
2% |
4% |
6% |
8% |
10% |
2000 |
600 |
4% |
6% |
8% |
10% |
12% |
3000 |
900 |
5% |
8% |
10% |
11% |
13% |
4000 |
1200 |
7% |
9% |
11% |
13% |
15% |
5000 |
1500 |
9% |
11% |
13% |
15% |
16% |
6000 |
1800 |
11% |
13% |
14% |
16% |
18% |
7000 |
2100 |
12% |
14% |
16% |
18% |
20% |
8000 |
2400 |
14% |
16% |
18% |
19% |
21% |
9000 |
2700 |
15% |
17% |
19% |
21% |
23% |
10000 |
3000 |
17% |
19% |
21% |
22% |
24% |
11000 |
3400 |
19% |
21% |
22% |
24% |
25% |
12000 |
3700 |
20% |
22% |
24% |
25% |
27% |
AIR JET SELECTION GUIDE
OUTLET JET |
INLET JET |
REDUCTION @ RICH POS. |
REDUCTION @ POSITION 4 |
ALUM&BRASS |
NONE |
<1% |
8% |
ALUM |
NONE |
<1% |
11% |
BRASS |
NONE |
<1% |
16% |
COPPER |
NONE |
<1% |
20% |
NONE |
NONE |
<1% |
20% |
ALUM&BRASS |
ALUM |
<1% |
8% |
ALUM |
ALUM |
<1% |
11% |
BRASS |
ALUM |
<1% |
16% |
COPPER |
ALUM |
<1% |
20% |
NONE |
ALUM |
<1% |
20% |
BRASS |
BRASS |
10% |
20% |
COPPER |
BRASS |
10% |
27% |
NONE |
BRASS |
10% |
27% |
| The altitude and temperature chart above with
the fuel flow charts below help determine the proper air jet selection and knob setting
for your atmospheric conditions. The graphs show approximate reduction as the knob is
rotated in either direction from "rich". |
| If you are jetted for -40F and 0 feet (0%) but
are at 0F and 5000 feet (13%) the MULTI-RANGE VARI FLOW jetting reduction
requirement is 13% (13%-0%). Or if you are jetted for -20F and 3000 feet (8%) but riding
at +20F and 9000 feet (21%), the MULTI-RANGE VARI FLOW reduction requirement is 13%
(21%-8%). The left flow chart (no inlet jet) says for either condition we could use the Brass
outlet jet with the knob at position 3 for a reduction of 13% or the Copper outlet
jet with the knob at position 2 (normally set on the rich side) for a reduction of 10%.
Another option is to use the Brass inlet and outlet jets, and using the curve on
the right, the knob should be at position 1 for a reduction of 12%. These curves can
vary for your application; verify with piston, plug, and/or EGT readings. |
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