Holley 2300 questions

Discussion in 'General IH Tech' started by RinTX, Aug 18, 2019.


  1. TorqueMonster1

    TorqueMonster1 Farmall Cub

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    In regards to the Holley 2300, which Mike Urich book do you recommend? I looked on eBay & Amazon. There are a number of different carburetor books by him. Starting at $8 and going up, way up on some. He has a book specifically for the 2300, used its $50ish and goes well beyond $100. If that’s “The” book then I’d be worth it. If there are others that are cheaper and still cover the same material that would be great. Can anyone comment about this? And a picture of the cover or complete name would be great. Thanks! Mark
     
  2. Greg R

    Greg R Dreams of Cub Cadets

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    The titles of the ones I have are "Holley Carburetors, Manifolds, & Fuel Injection" Mike Urich and Bill Fisher author/publisher with HP Books. Their dates can run from 1976 to 1992 depending which edition includes feedback carbs. They all cover the 2BBL 2300 very well and the 4BBL models. I don't always understand used book prices in the high end. I'll get soft cover or paperbacks in the $10 to $30 depending on the conditions and sources. Used library ones are always good deals as the vendors are usually non-profit. When I see used classics go from $10 for some with dog ears to $20 for clean ones yeah not bad, but who the heck thinks it's $120? Even new, HP Books rarely went over $20. Best case is look around, compare cost/condition, then the vendor rating. Abe's is a good dealer and most prices are reasonable.

    This is one of the ones I have: https://racetoolsdirect.com/product...MIr77w36iV5AIVFB-tBh3Z1AW2EAkYDSABEgL2u_D_BwE
     
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  3. TorqueMonster1

    TorqueMonster1 Farmall Cub

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    Thank You Greg. I'll do some reading up on some of the others and maybe buy another this weekend when I get the one you referred to in the link. Thank You! Mark
     
  4. RinTX

    RinTX High Wheeler

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    Carb is back on the engine and working well. About to take a test drive.
    I read somewhere that this hole...
    17E8C266-312D-41D3-9B47-F9865298A112.jpeg
    Was potentially a vacuum leak. It does appear to have suction there according to a simple finger test.
    I put a piece of tape over it for now. I’m wondering what it could have been for and should I plug it permanently?
    If yes, Use an appropriate size split shot?
     
  5. jeff campbell

    jeff campbell Lives in an IH Dealership

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    That hole is there for a reason. Not a carb wiz ! ?
     
  6. RinTX

    RinTX High Wheeler

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    I’m hoping one of our carb whiz folks will let me know.
     
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  7. RinTX

    RinTX High Wheeler

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    Something else I noticed - this carb is lacking an air vent tube. I’m not certain what the extension with an angle cut actually does but it is missing. I may try to fashion one myself.
    C1445C32-72F4-4081-97D5-508889EF055C.jpeg
     
  8. Greg R

    Greg R Dreams of Cub Cadets

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    Get the tape outta there. Fumes and oil will gum the tape, maybe loosen it and get sucked down the horn! Post a picture of the underside of the air horn, the rear part. That hole may connect to a passage but we gotta see the back side. Not all carbs have the extension tube, yours looks perzactly normal.
     
  9. RinTX

    RinTX High Wheeler

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    Couple of photos
    D19349D9-B12C-49E5-B28A-F7186C837BC5.jpeg 243EB946-F638-4CA9-9DED-D3CED024CB65.jpeg
    I just checked with mityvac. I was wrong earlier. There is no suction there
     
  10. RinTX

    RinTX High Wheeler

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    If I have the choke about here she doesn’t seem to surge or bog down.
    2FFEDAA8-8612-4EF8-A889-0A8FA736F3D6.jpeg
    Things are better. Before this rebuild it wanted the choke closed to not surge or bog down
     
  11. Greg R

    Greg R Dreams of Cub Cadets

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    You need vacuum readings. It's all guess and by golly without one.
     
  12. RinTX

    RinTX High Wheeler

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    About 16.5 at idle from the vacuum advance line.
    91B63A7C-DC0A-4DE9-B4BE-2E4FBAC6C772.jpeg
    I’m going to change the plugs and then try to adjust the idle mixture for maximum vacuum. I started with the screws out 1 1/2 turns iaw the directions. I’m actually not certain whether to turn them out or in. I believe the correct answer is turn them out until I get peak vacuum.
    Timing is at 8 degrees BTDC. Idle speed is currently at 670 rpm.
    It idles great. I’m just getting a little bog down or surge (I’m not sure how else to describe it) that occurs when driving with light pedal pressure. (As if trying to maintain steady speed 30-50 mph) The symptom goes away if I really push on the go pedal. It also goes away if I choke it just a bit as shown in my previous picture.
     
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  13. scoutboy74

    scoutboy74 Lives in an IH Dealership

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    Is that vac advance line sourced from an intake manifold fitting, or from a carb fitting above the throttle body? Usually it is the latter, in which case that's generally not the location to tap for a vacuum reading. It should be connected to a manifold source. Turning the idle/air mix screws CCW will enrich the mix at idle. That idle vac reading is a bit low for your elevation, but questionable sourcing for the gauge hookup could be an influencing factor there.
     
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  14. Greg R

    Greg R Dreams of Cub Cadets

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    Yes, turn them out until you get peak vacuum. Also you have to maintain spec'd idle RPM, I would try for 750-800 RPM If the idle mix adjustment raises RPM, reset the idle, and continue until you get maximum vacuum at rated RPM. The Service Manual section for 2300C carburetors says to start with 3 turns out on the idle mix screws. Your condition is definitely lean right now.
     
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  15. RinTX

    RinTX High Wheeler

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    700 rpm. 19” vacuum. Drivability much improved. Don’t have to choke it down. Might still be a bit of surge at road speed. Considering upping the jet size.
     
  16. scoutboy74

    scoutboy74 Lives in an IH Dealership

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    That's much better. Sure won't hurt to give those a try. You can always go back to the 51's if you don't like the change.
     
  17. RinTX

    RinTX High Wheeler

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    Side note here are the plugs that have been used for the last year. Don’t look too bad. Probably a bit rich since I’ve been having to choke it down.
    24E9C674-9674-45F6-88AE-6FD9F7529672.jpeg 9DB33200-9926-4A87-A9C5-CB546D32DB4E.jpeg
     
  18. Greg R

    Greg R Dreams of Cub Cadets

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    Check the fuel level in the fuel bowl first. Lean surge at cruise may be from low fuel bowl levels. Easy stuff first!! Did you ever get the information on which power valve you installed?
     
  19. RinTX

    RinTX High Wheeler

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    Greg. Thanks. I will get the truck level and check the fuel bowl level.
    I installed the single stage power valve marked 10.5 that came in the new rebuild kit ( from IHPA).
     
  20. RinTX

    RinTX High Wheeler

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    OBTW - I was sure I posted this pic earlier when I mentioned 19” at 700 rpm. Without a pic it never happened...
    F7C22A26-A7C5-40EE-9306-C70C6804064B.jpeg
     

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