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help starting a y-block

Discussion in 'The Hokey Ass Message Board' started by glendale, Mar 23, 2008.

  1. we have the ignition horwired and the starter. we have spark at the plugs. when we turn it over it backfires through the carb and shoots balls of flames from the manifolds. the only thing i can think is that it's 180 degrees out of time.
     
  2. Mattilac
    Joined: Oct 27, 2007
    Posts: 1,149

    Mattilac
    Member

    Sounds like a timing issue to me. Might I ask what the engine came out of?
     
  3. 61 ford galaxie wagon.
     
  4. devilscustom
    Joined: Feb 22, 2007
    Posts: 286

    devilscustom
    Member
    from Sweden

    are u know that number 1 2 3 4 are on the passenger side and 5 6 7 8 on the drivers side
     

  5. Mattilac
    Joined: Oct 27, 2007
    Posts: 1,149

    Mattilac
    Member

    Yeah make sure the firing order is correct.

    The order is 1-5-4-8-6-3-7-2
     
  6. mtkawboy
    Joined: Feb 12, 2007
    Posts: 1,213

    mtkawboy
    Member

    If you changed the timing chain & lined up the dots on the gears youre screwed
     
  7. 56Sedan
    Joined: Feb 4, 2008
    Posts: 203

    56Sedan
    Member

    The dots should be at the 3 oclock position with 12 pins between the dots.

    Why Ford did this I don't know! The only other motor like this is the 215/223 6cyl Ford.
     
  8. y block
    Joined: Feb 8, 2007
    Posts: 42

    y block
    Member
    from kcmo

    backfires through the carbs and balls of fire from the manifolds?! sounds like its running right to me!! :)
     
  9. thunderbirdesq
    Joined: Feb 15, 2006
    Posts: 6,989

    thunderbirdesq
    Member

    Make sure the firing order is correct and ALSO in these engines the distributor rotates Counter-Clockwise. That'll screw some folks up too...:D
     
  10. Mattilac
    Joined: Oct 27, 2007
    Posts: 1,149

    Mattilac
    Member

    My engine used to run pretty good on 5 cylinders; that was actually before I realized that I was missing something... I actually drove it like that for nearly 6 months.

    That explained why 3 of the exhaust header pipes remained painted nicely while the others were all burned up. It also explained why I couldn't figure out how to time the thing!
     
  11. Dominick Hide
    Joined: Dec 13, 2007
    Posts: 219

    Dominick Hide
    Member

    As mentioned above, 12 pins between dots, with dots at 3 o clock. However at this position the #6 piston is on the compression stroke not the #1. If you timed the engine in this position then you are, as others have suggested, 180 degrees out.
     
  12. Skankin' Rat Fink
    Joined: Jun 18, 2006
    Posts: 1,584

    Skankin' Rat Fink
    Member
    from NYC

    Screwed me up the first time ... 'cause the only motor I had worked on before that was my 223, whose dizzy rotates clockwise.
     
  13. zipper-z
    Joined: Aug 14, 2007
    Posts: 92

    zipper-z
    Member
    from MA

    any luck? We just fired my y-block for the first time since rebuild and blew out the brand new muffler. My ears are still ringing. Timing these things are a bitch.
     
  14. Sam_Fear
    Joined: Mar 16, 2008
    Posts: 36

    Sam_Fear
    Member

    It's also a remote possibility the damper could have moved also. That would throw your timing marks off.
     
  15. J'st Wandering
    Joined: Jan 28, 2004
    Posts: 1,772

    J'st Wandering
    Member

    Good to see that I am not the only one that lined up the timing dots wrong. :) I sure do remember the correct way now.

    Neal
     
  16. zipper-z
    Joined: Aug 14, 2007
    Posts: 92

    zipper-z
    Member
    from MA

    I lined up the dots both facing 3 oclock with the motor facing up and then put 12 pins in between the dots. That is how I was told to do it and what I had also read in a couple of manuals. That would be about right?
     
  17. nexxussian
    Joined: Mar 14, 2007
    Posts: 3,240

    nexxussian
    Member

    Could be the distributor 180 out as you suggest, I have done that on other engines and that sounds alot like what they do.

    Good luck.
     
  18. mtkawboy
    Joined: Feb 12, 2007
    Posts: 1,213

    mtkawboy
    Member

    Must have towed one 20 miles with one kid sitting in the engine compartment turning the distributer until we finally looked in the book and put the dots right..........auto shop 1962. Carb looked like a BBQ grill when we got it running. Reading directions first is a sign of weakness
     
  19. zipper-z
    Joined: Aug 14, 2007
    Posts: 92

    zipper-z
    Member
    from MA

    results of messed up timing setup...
     

    Attached Files:

  20. R Pope
    Joined: Jan 23, 2006
    Posts: 3,309

    R Pope
    Member

    Ah, the old "12 pins" bit, shades of my own mis-spent youth trying to burn down my shop starting redone "Y"s! And yes, I do believe that you time the dist. to #6 when the marks are set right. Another one of Henry's light bulb ideas!
     
  21. Mattilac
    Joined: Oct 27, 2007
    Posts: 1,149

    Mattilac
    Member

    Start with 6 degrees BTDC. Then progressively step it up to 8 or even 10. I've found that most average Y-blocks run best right around 8-10 degrees...
     

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