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Topic Review (Newest First)

  • 03-07-2013, 06:49 PM
    MACHINEHEAD1
    If the idle mix screws dont do anything, the throttle blades are open to far. Start here.
  • 03-06-2013, 06:59 PM
    SoldHondaBoughtHondo
    Quote Originally Posted by bowtiebro View Post
    so if moho means motorhome then its not imposible for a 402 to be in a moho it was a factory option to get a "400" bbc in late sixties trucks i dont know why they called it a "400" cause its a punched out 396 so maybe you do have a motorhome engine in your ride not a bad thing just saying its not impossible
    , as for the carb problems maybe its a timing issue causing the poor tuning abilities if the carbs check out ok then i would throw a light on it and see where its sitting at idle dont know if your running locked out or not but you might have a retarted timing issue
    LOL The 402, it got 'drilled' to 427, my timing is locked @36*-40*.and with carb mods idles fine....Think the op was having an issue with the engine not running at all below 2k........As long as he has no vacum leaks and the carbs are clean i think he will need to add fuel to the idle circut. I did run a single 1050 on a dart for a while and it wasn't happy at idle either. Knowing what i learned with the 660's a change in the idle air bleeds would have helped a lot.
  • 03-06-2013, 04:13 PM
    ol guy
    Quote Originally Posted by bowtiebro View Post
    so if moho means motorhome then its not imposible for a 402 to be in a moho it was a factory option to get a "400" bbc in late sixties trucks i dont know why they called it a "400" cause its a punched out 396 so maybe you do have a motorhome engine in your ride not a bad thing just saying its not impossible




    , as for the carb problems maybe its a timing issue causing the poor tuning abilities if the carbs check out ok then i would throw a light on it and see where its sitting at idle dont know if your running locked out or not but you might have a retarted timing issue
    That enters another possible problem. If the O.P. is running an ignition that allows curve to get thrown in to early he will never get it to idle down. Desk top diagnostics on a high performance engine without seeing the set-up is like jacking off with a wire brush! As I stated if the secondary butterflies are closed properly it may a good idea to take the distributer to a ignition place and have the swing and curve checked!
  • 03-06-2013, 02:28 PM
    bowtiebro
    Quote Originally Posted by SoldHondaBoughtHondo View Post
    Hey, it's only a little pro gas cam, since when did they put 402's in a MOHO and i seem to have the driveability issue solved with some drillability. I got what i deserve.....and i like it.
    so if moho means motorhome then its not imposible for a 402 to be in a moho it was a factory option to get a "400" bbc in late sixties trucks i dont know why they called it a "400" cause its a punched out 396 so maybe you do have a motorhome engine in your ride not a bad thing just saying its not impossible




    , as for the carb problems maybe its a timing issue causing the poor tuning abilities if the carbs check out ok then i would throw a light on it and see where its sitting at idle dont know if your running locked out or not but you might have a retarted timing issue
  • 03-06-2013, 02:08 PM
    SoldHondaBoughtHondo
    Quote Originally Posted by gn7 View Post
    You guys that insist on sticking cams from a top fuel deal into a stock MOHO engine get the engine get the drivability you deserve.
    Hey, it's only a little pro gas cam, since when did they put 402's in a MOHO and i seem to have the driveability issue solved with some drillability. I got what i deserve.....and i like it.
  • 03-06-2013, 10:37 AM
    ol guy
    Did anybody check the secondary butterflies to make sure they aren't being held open a pinch?
  • 03-05-2013, 09:35 PM
    gn7
    Quote Originally Posted by SoldHondaBoughtHondo View Post
    I had already drilled the throttle plates and adjusted them where they were supposed to be, themy next move was the .016 copper wire in the air bleed and then the mikuni m/c jets.
    You guys that insist on sticking cams from a top fuel deal into a stock MOHO engine get the engine get the drivability you deserve.



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  • 03-05-2013, 09:22 PM
    SoldHondaBoughtHondo
    Quote Originally Posted by gn7 View Post
    When you block off part of the intake air you are doing nothing more than creating a choke. A larger pressure drop is created in the carb and it actives the main circuit and addes more fuel.

    Blocking off part of the idle air bleed with a small wire would accomplish similar results.

    When you had the thing idling on the speed screw, you were probably for enough in to the blade angle to get the transition slot active and that added fuel.
    I had already drilled the throttle plates and adjusted them where they were supposed to be, themy next move was the .016 copper wire in the air bleed and then the mikuni m/c jets.
  • 03-05-2013, 02:57 PM
    gn7
    When you block off part of the intake air you are doing nothing more than creating a choke. A larger pressure drop is created in the carb and it actives the main circuit and addes more fuel.

    Blocking off part of the idle air bleed with a small wire would accomplish similar results.

    When you had the thing idling on the speed screw, you were probably for enough in to the blade angle to get the transition slot active and that added fuel.



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  • 03-05-2013, 09:08 AM
    SoldHondaBoughtHondo
    Quote Originally Posted by gn7 View Post
    I can't figure out if you're saying it will not run at all below 2000, or you can't get the idle down below 2000.
    Ran just like mine used to......idles at 2k no problem..back the speed screw out another half turn, rpm takes a dump and it dies..block 3/4 of the air horn off with duct tape and it idled fine...before i figured mine out i uses to tickle the acc pumps with the gas pedal....got me by when i had the .630 cam...700 cam..not even close.
  • 03-05-2013, 12:21 AM
    MACHINEHEAD1
    I ran 9776s on my Nailhead for over 10 years. Awsome carbs. Went up 2 jet sizes on the primary and put in a richer 2ndary plate.It was equal to 2-3 jet sizes and had a little bigger idle feed. I could go blubbery rich with 2 turns on all the screws. Ended up 1.25 turns. Could also kill it with leaness. Effective range was from 600rpm to over 1200rpm. And still no primary dribble. AFR was safe and rich 12.2:[email protected] Bottom line, these carbs would work on anything from a 289 to a 502 and idle fine. Something is way obvious/wrong here. ASSuming they are 9776, which they prob. are.
  • 03-03-2013, 07:11 PM
    gn7
    Quote Originally Posted by NOT A JET View Post
    Ok can't get this thing to idle right it is a little over 500 hp with a tunnel ram I called holley they said I could use 2 450s jetted up can't get it to idle under 2 grand no matter what I do I was told I have a vaccume leak
    Quote Originally Posted by NOT A JET View Post
    No shit I had to spell vacuum at my old job all the time when labeling pumps did a little messing around replaced t ram gaskets did not have time to start it so I don't no yet but from what I read on line thease carbs are know for this
    REALLY?

    Quote Originally Posted by MACHINEHEAD1 View Post
    What list # are the carbs?
    I'm guessing they are 9776
    Quote Originally Posted by River Rat 005 View Post
    WAAA WHOOOOOO!!!!!!! What did I win?????

    Tim
    This. Enjoy!!




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  • 03-03-2013, 06:01 PM
    River Rat 005
    Quote Originally Posted by BigSteve View Post
    And the winner is River Rat 005

    The only one to spell VACUUM correctly

    WAAA WHOOOOOO!!!!!!! What did I win?????

    Tim
  • 03-03-2013, 05:08 PM
    BigSteve
    Quote Originally Posted by NOT A JET View Post
    No shit I had to spell vacuum at my old job all the time when labeling pumps did a little messing around replaced t ram gaskets did not have time to start it so I don't no yet but from what I read on line thease carbs are know for this
    Its very important to make sure you don't have any vacuum leaks

    Some times the intake manifold will not fit correctly i.e. milled heads and a decked block. A gasket that shifted during assembly, not torquing the manifold in steps can cause a real problem at low speed and idle

    I have a propane tester that I use. for testing under the manifold leaks by injecting propane gas at the PCV opening in a valve cover. You may not have this feature on aftermarket valve covers with breathers
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