12 a


   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

   For the Weber:  Remote control of the fuel pressure regulator will do it.

   Soldering model plane engines needle and spray bar to the air correction jets can do it but needs remote control of the of the needles .

   Connecting the bowl vent to a tube on the dash and controlling air available to the bowl with a fish tank valve will do it. Used by many on the dyno in olden times.

   Lynn E. Hanover

I was thinking it might be possible to control the float level remotely.

Paul Lamar

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