Slant 6 timing

Electrical & Ignition

  1. fwi

    fwi Well-Known Member

    Messages:
    3,172
    Likes Received:
    4198
    Joined:
    Oct 25, 2010
    Location:
    BHC Arizona
    Local Time:
    7:57 AM
    Searched all over, including slant6 forum, too many discrepancies and opinions...I just want to know what would be a correct timing setting for a stock 225 slant 6.....It is also running rather rich as evidenced by very black (almost new) NGK plugs which were installed a couple of months ago by the guy I bought the car from.
     
  2. Darter6

    Darter6 FBBO Gold Member FBBO Gold Member

    Messages:
    5,147
    Likes Received:
    5715
    Joined:
    Dec 29, 2009
    Location:
    Nevada
    Local Time:
    9:57 AM
    With today's gas set it at 8* advanced no more than 10* and you will be good. It's not a Hot Rod (yet)Stone Stock. As far as the carb goes, check the carb base for looseness.The screws that hold the base to carb center may be loose.And check the carb to manifold bolts. Very common on Slants. Then play with a fresh air filter and adjust the air mixture screw for most vacuum and adjust idle screw how you like. You may not ever get away from the black plugs with everyday driving.
     
  3. khryslerkid

    khryslerkid FBBO Gold Member FBBO Gold Member

    Messages:
    24,361
    Likes Received:
    38187
    Joined:
    Mar 10, 2010
    Location:
    Hanover, Pennslyvania
    Local Time:
    10:57 AM
    I'm thinking this is for your 1964. The FSM is showing 2 1/2 degrees Before Top Dead center. Plug the vacuum advance. .017 to .023 on the point setting.

    Sounds like your carb is running rich. They were known for bad accelerator pumps.
     
    • Agree Agree x 1
    • 69a100

      69a100 Well-Known Member

      Messages:
      9,667
      Likes Received:
      13685
      Joined:
      Aug 22, 2012
      Location:
      The Real World
      Local Time:
      7:57 AM
      Is the motor stock? My van has a stock motor that I upgraded with a super6 and weber 32/36 carb. I'm guessing that mine is around 8 or 9*, anything much more then that and I have pinging with 87 and a stock curve on the dist. during accel.
      The consciences seems to be that around 10*, the /6 is the happiest. Hope this helps?
       
      • Thanks! Thanks! x 1
      • Agree Agree x 1
      • 727

        727 Well-Known Member

        Messages:
        538
        Likes Received:
        416
        Joined:
        May 18, 2015
        Location:
        Mississippi
        Local Time:
        9:57 AM
        I bought a truck with a barely running /6. There wasn't a way to get the timing just right. I got it run better by opening up the distributor bolt hole hold down notch. Finally changed the timing chain and it set everything back to normal. The engine runs great now.
         
      • fwi

        fwi Well-Known Member

        Messages:
        3,172
        Likes Received:
        4198
        Joined:
        Oct 25, 2010
        Location:
        BHC Arizona
        Local Time:
        7:57 AM
        After checking all the plugs (NGK R-4), gapping them at .037, removing the plug washers, put everything back together and.......
        Now I got bigger problems!
        Turn the key to start......nothing happens, no starter, no click.
        IMG_1366.JPG Checked all pertinent wires, all seem good (battery is brand new and I have power to everything else).
        So i jumped the solenoid and started it, am thinking the culprit could be the starter relay, any advice is always appreciated. Thanks.
         
      • Darter6

        Darter6 FBBO Gold Member FBBO Gold Member

        Messages:
        5,147
        Likes Received:
        5715
        Joined:
        Dec 29, 2009
        Location:
        Nevada
        Local Time:
        9:57 AM
        Yep,my 68 was hit or miss, finally changed the relay.There are 2 different ones.One for stick and one for automatic. You have been thinking about putting a automatic in it so you may want to buy one for the automatic. It has a extra spade terminal for the neutral safety wire that will hook to the switch on the tranny.
         
        • Thanks! Thanks! x 1
        • khryslerkid

          khryslerkid FBBO Gold Member FBBO Gold Member

          Messages:
          24,361
          Likes Received:
          38187
          Joined:
          Mar 10, 2010
          Location:
          Hanover, Pennslyvania
          Local Time:
          10:57 AM
          37 seems a bit wide? Why did you remove the plug washers?
          What year engine do you have? Electronic ignition or points?
           
        • fwi

          fwi Well-Known Member

          Messages:
          3,172
          Likes Received:
          4198
          Joined:
          Oct 25, 2010
          Location:
          BHC Arizona
          Local Time:
          7:57 AM
          Lots of mentions of it being a necessity on the Slant 6 forum.
          Believe the engine is a stock 64 with points.....can't really read the little pad behind the coil, only the block# 2463430-3. Distributor with points.
          They also recommended the .037 gap, why, should I go smaller?
          I will have to time it, as it is hard to start and runs very rough at first.
           
        • khryslerkid

          khryslerkid FBBO Gold Member FBBO Gold Member

          Messages:
          24,361
          Likes Received:
          38187
          Joined:
          Mar 10, 2010
          Location:
          Hanover, Pennslyvania
          Local Time:
          10:57 AM
          I've never heard of removing the compression washers. That's there to seal the plug to the head.

          .035 is the recommended gap on the N-16Y Champion plug that's in the FSM. Don't think you'll find that plug but here's a cross reference. It's a 14mm plug with a 3/4" reach. I can't find the plug you mentioned.
          https://www.sparkplug-crossreference.com/convert/CHAMP_PN/N16Y

          We use to set the timing mark on the front to TDC then pull the distributor. Set the points on the work bench in a vice. Every one ran like a sewing machine when tuned. Miss working on those Tower of Powers!

          @Slantsixdan is your /6 guru on here!
           
          • Thanks! Thanks! x 1
          • fwi

            fwi Well-Known Member

            Messages:
            3,172
            Likes Received:
            4198
            Joined:
            Oct 25, 2010
            Location:
            BHC Arizona
            Local Time:
            7:57 AM
            Slant 6 Dan's post:
            Posted: Thu May 26, 2011 12:20 pm
            Board Sponsor & Contributor

            Joined: Thu Oct 31, 2002 5:39 pm
            Posts: 23098
            Location: North America
            Car Model*:
            14mm is the thread size, not the hex size. The plugs you're taking out are 13/16" hex. The ones you should put in (NGK ZFR5N, stock number 3459) are 5/8" hex. Use a spark plug socket (w/rubber insert), not just a regular deep-well, or you're liable to break off a spark plug and cause yourself much more hassle than it would be to get and use the correct socket in the first place. Tune-up parts and technique suggestions in this thread.

            Whether you follow or ignore the plug recommendation, remember to remove the metal ring washers from the plugs before installing.

            Champion is junk from America. Autolite is junk from China. And if you've fouled NGK #4s, there's something the matter -- #4 is hotter than called for.

            _________________
            一期一会
             
          • Darter6

            Darter6 FBBO Gold Member FBBO Gold Member

            Messages:
            5,147
            Likes Received:
            5715
            Joined:
            Dec 29, 2009
            Location:
            Nevada
            Local Time:
            9:57 AM
            I too don't remove the washer. BUT I do understand the reason is, the spark plug tube that is aluminum makes the seal.Also some believe that (though minimal) it allows the plug deeper in the combustion chamber taking up more space increasing compression. But again this is just what I have read over the years. Take it for what it's worth.To me it's not much.
            And not to take anything away from Dan but everybody has their own way of doing things.
             
          • danf_fl

            danf_fl Well-Known Member

            Messages:
            112
            Likes Received:
            80
            Joined:
            Aug 7, 2018
            Location:
            NW Florida
            Local Time:
            9:57 AM
            Reseat the connectors that slide off and on.
             
          • fwi

            fwi Well-Known Member

            Messages:
            3,172
            Likes Received:
            4198
            Joined:
            Oct 25, 2010
            Location:
            BHC Arizona
            Local Time:
            7:57 AM
            UPDATE...... installed new starter relay, cranks over fine, but now it won't start!
            Plenty of fuel getting to the carb, sounds like there is no spark, its not even trying to fire!. Yes, I checked all the plug wires, coil wire.....what have I missed?
             
          1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
            By continuing to use this site, you are consenting to our use of cookies.