Holley idle mixture advise
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Holley idle mixture advise

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    Strap on the JATO konajet74's Avatar
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    Default Holley idle mixture advise

    Hi guys, I need a little advise as to which way to go about
    this; I have a 454 9.5/1comp, holley 800dp marine 9022 carb,
    Edelbrock Victor Jr (rect), Crane ZHR-288 cam(226/234 @.050),
    a little over 15in of Vacuum at Idle(900rpm). I'm having trouble
    getting the idle mixture correct. The primary's are 1 1/2 open from
    seated & the secondary's are 1/2 from seated. If I turn one side of
    the idle mixture screw all the way in, nothing happens. If I leave it
    and go to the other side I can finally get the motor to start to die
    w/ 1/2-1 turn in (set at 1 1/2 out). I'm trying to keep from drilling holes
    in the primary plates. Should I maybe open the secondary plate a little
    and close the primary respectfully to lessen the exposure of the transfer
    slot? I'm just learning these holley's from having Edelbrocks.......
    Thanks for any input in advance!!

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    Boat Nut sleekcrafter's Avatar
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    Quote Originally Posted by konajet74 View Post
    Hi guys, I need a little advise as to which way to go about
    this; I have a 454 9.5/1comp, holley 800dp marine 9022 carb,
    Edelbrock Victor Jr (rect), Crane ZHR-288 cam(226/234 @.050),
    a little over 15in of Vacuum at Idle(900rpm). I'm having trouble
    getting the idle mixture correct. The primary's are 1 1/2 open from
    seated & the secondary's are 1/2 from seated. If I turn one side of
    the idle mixture screw all the way in, nothing happens. If I leave it
    and go to the other side I can finally get the motor to start to die
    w/ 1/2-1 turn in (set at 1 1/2 out). I'm trying to keep from drilling holes
    in the primary plates. Should I maybe open the secondary plate a little
    and close the primary respectfully to lessen the exposure of the transfer
    slot? I'm just learning these holley's from having Edelbrocks.......
    Thanks for any input in advance!!

    There is a screw for the secondary plate stop, accessed from the bottom of the carb, thru the base plate. I like to remove that screw, and run in an Allen set screw from the top side of the base plate, this allows adjustment while still bolted on the engine. All the four corners should be set the same, if you have one that is not functioning, you have some blockage some where in the circuit. hope this helps

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    Strap on the JATO konajet74's Avatar
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    the holley rebuild instructions say to open the primaries to 1 1/2
    from seated and the secondaries to 1/2 from seated? Is it easier to
    tune with them the same open adjusted(1 turn open both primary & secondary)?

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    Senior Member GT Jets's Avatar
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    At what RPM are you trying to get it to idle? With that combo, I would think it would want to be at around 1100 R's, which may require a small hole in each primary butterfly, you can open up the secondary butterflies to compensate but may result in an off idle hesitation, a numerically larger power valve may help this out, the easiest way to see if you have a carb problem in this case is to give the engine a little manifold vacuum leak and try and make your adjustments, if you have a circuit that won't adjust, it may be time to take a closer look at that metering block for some debris.

    The vacuum leak needs to be closed off when done and the adjustments changed again, but it will make "slop" count the same as "skill".

    Once adjusted all four corners may be slightly different as far as "turns out" but should end up quite close..

    Good luck.

    GT
    GT


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    Strap on the JATO konajet74's Avatar
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    With this much vacuum I shouldn't be having this problem.
    The metering plates are clean, all the ports are good.

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    Senior Member Widetrack's Avatar
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    This is the same problem I had with an 850! Did get some good advice but this is what I learned! Check timing where are you set, all four corners should be close to the same! Timing if to high will cause preingition and give you hell and will cause the mixture screws to be mix settings! Set all four corners 3/4 of a turn out and play with the plates at lowest possible RPM! You might have to pull the carb off to check the transfer slots to make sure you haven't opened them up too much! When all is set to smoothest recheck the mixture screws again! Good luck! WT


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    Cantard 71hallett's Avatar
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    Quote Originally Posted by Widetrack View Post
    This is the same problem I had with an 850! Did get some good advice but this is what I learned! Check timing where are you set, all four corners should be close to the same! Timing if to high will cause preingition and give you hell and will cause the mixture screws to be mix settings! Set all four corners 3/4 of a turn out and play with the plates at lowest possible RPM! You might have to pull the carb off to check the transfer slots to make sure you haven't opened them up too much! When all is set to smoothest recheck the mixture screws again! Good luck! WT
    Awesome advice!! x2
    Quote Originally Posted by gn7 View Post
    It would be a balmy 85* in Steel's shop if he would move a little faster

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    Strap on the JATO konajet74's Avatar
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    Quote Originally Posted by Widetrack View Post
    This is the same problem I had with an 850! Did get some good advice but this is what I learned! Check timing where are you set, all four corners should be close to the same! Timing if to high will cause preingition and give you hell and will cause the mixture screws to be mix settings! Set all four corners 3/4 of a turn out and play with the plates at lowest possible RPM! You might have to pull the carb off to check the transfer slots to make sure you haven't opened them up too much! When all is set to smoothest recheck the mixture screws again! Good luck! WT
    Widetrack, This is EXACTLY what I was looking for! Thanks alot!! I only have mixture screws on the primaries. The initial timing is at 18deg w/ a total of 34. Maybe too much initial?

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    Cantard 71hallett's Avatar
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    Quote Originally Posted by konajet74 View Post
    Widetrack, This is EXACTLY what I was looking for! Thanks alot!! I only have mixture screws on the primaries. The initial timing is at 18deg w/ a total of 34. Maybe too much initial?
    Not enough. I would try bumping it up to atleast 28.
    Quote Originally Posted by gn7 View Post
    It would be a balmy 85* in Steel's shop if he would move a little faster

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    Strap on the JATO konajet74's Avatar
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    Quote Originally Posted by 71hallett View Post
    Not enough. I would try bumping it up to atleast 28.
    28???? O.K, i'm confussed.....Wouldn't that make it harder to start & cause pre-ignition?

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    Cantard 71hallett's Avatar
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    Quote Originally Posted by konajet74 View Post
    28???? O.K, i'm confussed.....Wouldn't that make it harder to start & cause pre-ignition?
    Will still start fine at 28. 99% of the stuff I do is all locked down with no problems starting. I bet if you locked yours in at 34 you would have no problems. What do you have for ignition? Going to be hard to only advance 6 deg.
    Last edited by 71hallett; 10-22-2008 at 04:51 PM.
    Quote Originally Posted by gn7 View Post
    It would be a balmy 85* in Steel's shop if he would move a little faster

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    Boat Nut sleekcrafter's Avatar
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    Quote Originally Posted by 71hallett View Post
    Will still start fine at 28. 99% of the stuff I do is all locked down with no problems starting. I bet if you locked yours in at 34 you would have no problems. What do you have for ignition? Going to be hard to only advance 6 deg.
    Your kidding right, I cleaned the teeth off my ring gear in two spots, and sheared the bendix off the starter. This was a mishap, the advance return springs rusted away, and broke. Distributor was stuck in full advance....KAPOW!! I agree, run as much as you can for initial advance, and let the mechanical bring in the rest. I had a good battery, and a good starter, but the motor got the best of it.

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    Senior Member The Violater's Avatar
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    Quote Originally Posted by sleekcrafter View Post
    Your kidding right, I cleaned the teeth off my ring gear in two spots, and sheared the bendix off the starter. This was a mishap, the advance return springs rusted away, and broke. Distributor was stuck in full advance....KAPOW!! I agree, run as much as you can for initial advance, and let the mechanical bring in the rest. I had a good battery, and a good starter, but the motor got the best of it.
    12 degree's Idle 29 total, starts great in gear idles all day. MSD dist. that is adjustable.............. works for me.
    / The Few The Proud TheBlown

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    Quote Originally Posted by The Violater View Post
    12 degree's Idle 29 total, starts great in gear idles all day. MSD dist. that is adjustable.............. works for me.
    Also, I've had problems with restricted metering blocks, took them off blew them out and got them to adjust, make sure your base gaskets are not leaking air also, and if the carbs are old sometimes they suck air through the throttle shaft..................never over look the basic easy stuff !
    / The Few The Proud TheBlown

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