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  •  » Ignition advance settings

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    7/18/2014 11:52 AM  #1

    Rudi
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    From: Stuck in the 50's Welland Ca
    Registered: 4/01/2013
    Posts: 3,992

    Ignition advance settings

    I have tossed this out at a few sites but as yet I have no solution, perhaps there are some answers here.
    OK, here are the specs;
     331 stroker 9.1 to 1 cr with 150# cylinder pressure
     cam is 220 in and out @.050 with 110 lobe separation 
    Holley 670 Edel performer heads and RPM manifold. 
    Crane HI-6 box,LS-91 coil and Street and race distributer Dizzy has 3 vacuum and 9 mechanical advance selections
     TDC is verified

      I have tried in vain to get this set up to run on  mid grade and 87 octane.  No combination of initial , vacuum and mechanical setting will work, it either will idle nicely and ping on acceleration  or will idle rough and not ping.

     Crane tech has not offered any solutions  so I guess I'm stuck with hi test. 

     Using 91-93 with 10% eth. and the distributer vacuum advance set at 0, initial at about 12-15 degrees it idles a bit rough  but needs to be there to prevent preignition.  The car is not raced, it's a driver. So, the question is what kind of advance curve setting should I use for optimum gas mileage when the cruise RPM is 2000 at 70 MPH.

    Good work ain't cheap, Cheap work ain't good!   Simple Man
     

    7/18/2014 12:35 PM  #2

    at
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    From: Tampa FL
    Registered: 4/02/2013
    Posts: 275

    Re: Ignition advance settings

    Have you plotted the ignition curves? What's your total timing at 2000? Sounds like you might benefit from a slower curve. Maybe try starting with 8-10 degrees initial and 20 degrees total at 2000 rpm(with the vacuum advance still at 0). It's also possible you could be a little lean or have a vacuum leak. All the ignition mods in the world won't cure that.

    Last edited by at (7/18/2014 12:36 PM)

    You can lead a horse to water, but you can't get him drunk
     

    7/18/2014 2:55 PM  #3

    Nasty65
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    Registered: 4/21/2013
    Posts: 118

    Re: Ignition advance settings

    may be a carburetor issue.  9:1 compression with aluminum heads ought to run easily and well on 87 octane fuel.

    Last edited by Nasty65 (7/18/2014 2:56 PM)

     

    7/18/2014 5:24 PM  #4

    BobE
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    From: White Plains, NY
    Registered: 4/04/2013
    Posts: 2,720

    Re: Ignition advance settings

    What is your idle RPM?  I'm guessing you should be able to idle around the 700-900 range.
    How any turns open are the idle mixtures screws?
    You may need to play with the idle mixture and the idle speed adjustments to get to the "right" place.
    I'd play with these first, with initial timing in the 10-15 range.  Then I would attack the off idle timing curve.

    65 Fastback, 351W, 5-speed, 4 wheel discs, 9" rear,  R&C Front End.
     

    7/19/2014 4:47 PM  #5

    6sally6
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    From: Surfside Beach,SC
    Registered: 4/02/2013
    Posts: 6,895

    Re: Ignition advance settings

    Try about 20* initial(maybe even more) and a total of 36* @2000RPM. That is -oh no I used a word I shouldn't have--uming the starter will spin it over when hot.
    That LSA and duration likes a lot of initial to clean up the idle.
    Have the vacuum advance hooked up to manifold vacuum NOT ported vacuum.
    With a pile of initial re-adjust the carb and you should be able to lower the idle screw to get the curb idle down where you need it.
    A lot of fellows even go with a fully locked out distrib. butt you are not that radical on the camshaft IMHO.
    6sal6

    Get busy Liv'in or get busy Die'n....Host of the 2020 Bash at the Beach/The only Bash that got cancelled  )8
     

    7/19/2014 6:55 PM  #6

    Rudi
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    From: Stuck in the 50's Welland Ca
    Registered: 4/01/2013
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    Re: Ignition advance settings

    I am having better results with initial 15 advance and the vacuum disabled and a total of 38 degrees.
    I am going to substitute the Crane distributer with the original and see what that combo does.

    Good work ain't cheap, Cheap work ain't good!   Simple Man
       •Thread Starter
     

    7/19/2014 9:40 PM  #7

    6sally6
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    From: Surfside Beach,SC
    Registered: 4/02/2013
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    Re: Ignition advance settings

    Rudi.........was the cam degreed when installed?
    6s6

    Get busy Liv'in or get busy Die'n....Host of the 2020 Bash at the Beach/The only Bash that got cancelled  )8
     

    7/20/2014 12:57 AM  #8

    Jon Richard
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    Registered: 8/23/2013
    Posts: 199

    Re: Ignition advance settings

    6sally6 wrote:

    Try about 20* initial(maybe even more) and a total of 36* @2000RPM. That is -oh no I used a word I shouldn't have--uming the starter will spin it over when hot.

    Have the vacuum advance hooked up to manifold vacuum NOT ported vacuum.6sal6

    ^
    The whole reason I'm installing a PMGR starter is that setting mine to 18* initial running ported vacuum the engine wouldn't turn over cold.

    Does that HI-6 CD box have a start/ retard function?
     

     

    7/20/2014 7:53 AM  #9

    Nasty65
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    Registered: 4/21/2013
    Posts: 118

    Re: Ignition advance settings

    Is the carb new or in "out of the box" condition?  Has it had anything changed or done to it, i.e. jetting etc...?  how far out are the idle mixture screws?

     

    7/20/2014 1:31 PM  #10

    6sally6
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    From: Surfside Beach,SC
    Registered: 4/02/2013
    Posts: 6,895

    Re: Ignition advance settings

    6sally6 wrote:

    Try about 20* initial(maybe even more) and a total of 36* @2000RPM. That is -oh no I used a word I shouldn't have--uming the starter will spin it over when hot.
    That LSA and duration likes a lot of initial to clean up the idle.
    Have the vacuum advance hooked up to manifold vacuum NOT ported vacuum.
    With a pile of initial re-adjust the carb and you should be able to lower the idle screw to get the curb idle down where you need it.
    A lot of fellows even go with a fully locked out distrib. butt you are not that radical on the camshaft IMHO.
    6sal6

    WHAT!!!!!! ASSUMING is a naughty word?! Gimme a brake(automotive talk for break!)
     

    Get busy Liv'in or get busy Die'n....Host of the 2020 Bash at the Beach/The only Bash that got cancelled  )8
     

    7/20/2014 7:24 PM  #11

    Rudi
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    From: Stuck in the 50's Welland Ca
    Registered: 4/01/2013
    Posts: 3,992

    Re: Ignition advance settings

    The cam was degree'd.
    The carb has been tuned and the air bleed screws are set to max vacuum.
     The idle rpm is 7-800 in drive.
    There are 9 advance settings to choose from I have the preignition under control, all in at 2000.
     I'm working on the idle now.

    Good work ain't cheap, Cheap work ain't good!   Simple Man
       •Thread Starter
     

     

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