Subject: Holley Carb
From: rotaryeng
Date: 9/12/2013, 10:14 AM
To: AAA-rotaryeng


   There was discussion on a fuel cut off kit for the Holley carb. I was thinking EFI at the time for my installation so I didn't look at it very well. Now I am reconsidering. Can the fuel cut off be used for leaning? Who sells this kit? Thanks.

   Paul Shamlian


   Tom McNeilly <tomcn@earthlink.net <mailto:tomcn@earthlink.net> <mailto:tomcn@earthlink.net <mailto:tomcn@earthlink.net>>>


   It is more than a fuel cut off. You can lean the mixture.

   Here are some 3D's. The 500 CFM 2 barrel is about right for a P-port
   13B or RX8 engine.


   What kind of airplane are you building Paul?

   Paul Lamar

--------------------------------------------------------------------------------------------
   "The mixture control body is CNC machined from 6061-T6 aluminum which is
   alodine treated, the shaft is stainless steel and the screws are plated
   steel.

   The first picture is what comes in the kit. The mixture control plate is in
   the background with the accelerator pump extension arm., power valve block
   off plug, and installation bolts in the foreground.  I also include a set of
   three gaskets which are not shown.

     The second picture is a unit installed on a 4 barrel Holley carburetor.
   The installer is responsible for the push-pull cables and attachment
   hardware.  As you can see, the unit is installed in-between the jet plate
   and the float bowl.  This requires the use of longer float bowl bolts which
   are included in the kit.  The arm swings through 90 degrees of rotation from
   idle cut-off to full rich. The arm can be clocked anywhere on the shaft to
   make installation easier.  The arm in the photo is in the full rich position
   and idle cut-off would be in the 4 o'clock position. Two shafts are available
   to make full rich either in the clockwise rotation or counter-clockwise
   rotation.  This sometimes simplifies the push-pull cable installation.  I
   usually ship the counter-clockwise to full rich shaft, as this parallels the
   throttle rotation on the opposite side of the carburetor."

   Tom McNeilly <tomcn@earthlink.net <mailto:tomcn@earthlink.net> <mailto:tomcn@earthlink.net <mailto:tomcn@earthlink.net>>>
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   The plane is a Bearhawk Patrol. It will be used for off airport and high altitude mountain flying.

   Paul Shamlian


    It will be spectacular with an 80 inch prop, a 250 HP p-port engine and a 3.12:1 gear box.
   A 500 CFM Holley 2 Barrel carb will work fine. Plenty of room under the cowl.

   When we get the new Outboard/Vespa style ignition working it will run with out an electrical
   system and/or battery.  Just like a Cub. Gravity feed fuel tanks.

   Tell Bob I said hello next time you speak to him.  I usually see him at Sun n Fun and Oskosh
   when I was still going :)

   Paul Lamar


Can the engine be hand propped with the PSRU? Seems like the PSRU would not only triple the amount compression strokes in a swing of the propeller but it would also triple the amount of pressure to get through each compression stroke.

Paul Shamlian

My guess is the prop will not have enough inertia to drive the engine through the 3.12 step up gear box.

Maybe a rope starter could be made to work. Tie one rope from the right side engine to a stump and the other around a pulley on the e-shaft nose. Getting a running start off to the left of the engine.  Works with outboards.

I am only half joking :)

Paul Lamar

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