12
Paul: Do you think it is possible to put a leaning block of some sort to the holley sidedraft carb 45 DOCE 152 G
If i put this carb on my p port the intake runners will have the correct lenght and straight running and no complex bends.m
The intakes will be the same as the fuel injection with slide throttle low profile but straight with this sidedraft set up.
I want to put in an holley carb solid and no complexity or electronic failure waiting to happen .
Le Roux Breytenbach
It is possible. Here is what the leaning valve looks like on the Holley 500 CFM
2 barrel.
quote
INSTALLATION INSTRUCTIONS
These instructions demonstrate the correct installation of your new
Adjust-A-Jet into the Holleyâ carburetor. After installation, the result is instant,
external, main fuel metering, with no change in fuel emulsion characteristics or any
other tuning procedures nor does the Adjust-A-Jet replace the metering block. This
makes the Adjust-A-Jet a valuable tool for hard core racers as well as street
enthusiasts. CNC machined from 6061 T-6 aluminum, the Adjust-A-Jet comes with high
quality installation components.
Parts List Back to Top
1 – Adjust-A-Jet metering plate 2 – Reusable Buna-N gaskets
4 – Hex/washer head float bowl bolts 4 – Nylon float bowl bolt gaskets
1 – Accelerator pump arm 1 – Metering needle
1 – Stainless hold down nut 1 – Viton o-ring
1 – Foam insert (slosh preventative)
After removing the float bowl from the carburetor, the first procedure is to
install the extended accelerator pump arm. Using a 1/8 inch round punch; drive the
roll pin out just enough to allow removal of the existing arm. Install the new arm
in its place, and drive the roll pin back into its previous position.
After you have removed the original jets from the metering block, remove all
gasket material that may still be on the bowl and metering block. Place one of the
supplied gaskets on the metering block. Next make sure you place the foam insert
between the Adjust-A-Jet and the metering block. Hold the next gasket in place while
installing the bowl. Make sure the accelerator pump linkage is intact. Gradually
tighten the float bowl bolts. At this time the accelerator pump arm adjustment must
be corrected.
Finally, place the o-ring in the bore around the metering needle hole.
Carefully turn the needle to a fully closed position using your fingertips. This is
done so that the tip of the needle does not get damaged due to over tightening.
Install the hold down nut to a slight pressure on the o-ring.
Now you are ready for your initial setting. On the reverse side of this page
you will find a chart comparing Holleyâ jet sizes to fractional turns of the
Adjust-A-Jet metering needle. These are turns open from a fully closed position.
Unfortunately, we have to use an average vacuum at the venturi to develop this
chart. You may find this chart slightly inaccurate in some applications. The
Adjust-A-Jet ranges from the equivalent of 60 jets at one turn open position, to
approximately two .140 orifices at a wide-open position (do not close the metering
needle completely as it will shut off the fuel). Eventually, you will adapt to
making an adjustment for lean/richness, instead of a change in jet size. On the
secondary side of some carburetors, minor hand filing on the top of a large vacuum
port may be required to make clearance for the Adjust-A-Jet.
Frequently Asked Questions: Back to Top
How do you know where to start?
The Adjust-A-Jet is supplied with a chart that compares jet sizes to particular
number of turns open, this of course is only to get the engine running, after that
you no longer need the chart because you are making a rich/lean adjustment, instead
of a jet change.
Does the Adjust-A-Jet replace the metering block?
NO! The Adjust-A-Jet bolts in between the metering block and fuel bowl. It
does not effect any emulsion or idle characteristics and will bolt on with little or
no modifications.
Do you have to change needle valves for different “Jet” ranges?
The needle valve supplied with the Adjust-A-Jet ranges from the equivalent of a
size 63 “Jet” to 2.140 size orifices (Street/Strip gas 55001 and Dominator 55002).
The alcohol blocks (Street/Strip and Dominator 55003) of course have larger orifices
to accommodate the extra alcohol. If you require a smaller range in “Jet” sizes,
call Percy’s and we will send one at no charge!
Will the Adjust-A-Jet work with a 50cc Accelerator Pump?
Yes! Pump size will not effect the installation of the Adjust-A-Jet.
Can the Adjust-A-Jet be used on a “modified” Holley?
Yes! The Adjust-A-Jet does not affect the original emulsion characteristics and
therefore may be used on any HOLLEY or modified HOLLEY carburetor. This includes
Holley’s pro-series carbs, as well as the new CLAW from Barry Grant.
What is the difference between the Street/Strip Adjust-A-Jet and the Circle
Track Adjust-A-Jet?
Because fuel is constantly being pulled towards one side of the fuel bowl by
centrifugal force, the Circle Track Adjust-A-Jet’s (Gas 55004 primary and 55005
secondary) have only 1 pick up hole on the outward side of the carburetor. This
eliminates fuel starvation and air pockets during a corner. (Alcohol applications
are also available 55006 primary and 55007 secondary.)
What if I have staggered jets on my Circle Track car?
Because the Circle Track Adjust-A-Jet has only 1 pick up hole, it eliminates the
need for jet staggering. The Adjust-A-Jet feeds 2 ventures with one orifice. This
enables the ventures to pull what they demand and “balance out”.
What do you do with the power valve?
The Adjust-A-Jet does not replace the metering block, therefore the power valve
is still used.
Do you run a specific Holley Jet with the Adjust-A-Jet?
NO! The jets are completely removed from the metering block. The Adjust-A-Jet
has outlet holes that mate to the jet bosses, this is what gives the Adjust-A-Jet its
wide range of adjustment.
What is the best way to tune with the Adjust-A-Jet?
The great thing about the Adjust-A-Jet is that all of your tuning procedures
remain the same. However Percy’s does recommend the use of their Digital Exhaust
Temp. Indicator (part # 55100). This tool is like having an on-board dyno; with it
you’ll be capable of putting a perfect tune on your engine in a matter of seconds
instead of minutes or hours. It’s also a great safety device!!
end quote
Paul Lamar
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