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Technical 8ba firing order

Discussion in 'The Hokey Ass Message Board' started by nobby, Apr 16, 2023.

  1. nobby
    Joined: Jan 8, 2006
    Posts: 1,358

    nobby
    Member

    [​IMG]
    is that correct?

    so number 1 piston is at the top
    is the intake valve closing = closed on number 1 ?

    spinning the engine over without the heads on, checking for oil flow
    what am i looking for?
    do i do it on the starter?


    watching marts video, with number one on the dizzy at 6 o'clock?
     
  2. Budget36
    Joined: Nov 29, 2014
    Posts: 15,272

    Budget36
    Member

    Pretty sure Mac VanPelt has the firing order on his site. For sure a reliable source.
     
  3. nobby
    Joined: Jan 8, 2006
    Posts: 1,358

    nobby
    Member

  4. nobby
    Joined: Jan 8, 2006
    Posts: 1,358

    nobby
    Member

    stoopind question
    va***n advanse says 2 inches
    -thats low?
    compared to say 16 of a sbc?
    that mean the springemythings are MUCH weaker in the 8ba dizzy that a chevrolet and you almost have to account for that somhow?
    i.e. if you want to fart **** about with electronic ignition with va***n advance?
    so what happens when you fit a 390 holley for the take off to the distributor.
     
  5. nobby
    Joined: Jan 8, 2006
    Posts: 1,358

    nobby
    Member

    compression ratio heads? i have the 7.2 to 1?
    that means i need to see 125 psi with the compression guage?
     
  6. nobby
    Joined: Jan 8, 2006
    Posts: 1,358

    nobby
    Member

    [​IMG]
    yes, thats why the dizzys are soooooooo long, to clear the belt
    shame you couldnt rotate the timing cover 15 degrees and fit a really short dizzy with a tiny cap from something like a rover v8
    [​IMG]
     
  7. nobby
    Joined: Jan 8, 2006
    Posts: 1,358

    nobby
    Member

    no one ever fitting a air cooled but alternator on them am have it sit into a milled scoop of the intake, tensioned by the half pulleys and shims
     
  8. Budget36
    Joined: Nov 29, 2014
    Posts: 15,272

    Budget36
    Member

    Jim Linder (bubba) I recall talked about FH fords and advance. Been awhile but I think he said something like 16-18 for full advance. This came up years back on the FordBarn and folks using a Chevy distributor.
     
  9. From post #4,,,,, I believe it is 2 degrees initial advance,,,,then about 16-18 total.
    Or wherever the engine runs the best without pinging .

    Tommy
     
  10. Jack E/NJ
    Joined: Mar 5, 2011
    Posts: 970

    Jack E/NJ
    Member
    from NJ

    >>>s that correct?>>>so number 1 piston is at the top>>>

    Technically, not exactly. Number 5 piston is at the top in Ford's numbering system. And everybody who is anybody knows Ford's cyl numbering system seriously lacks common sense.

    #1 cyl should be over the 1st crank throw at the top. Not the 2nd. And #5 cyl should be over the 5th throw, not the 1st. Who counts like that? Common sense says the firing order is 18736542, not 15486372.

    Furthermore, Ford mixed #4 & #7 cyls. Who does that? GM, Xler, Packard, Stude didn't. Except maybe for a few experiments to see what happens. Nothing much. For normal people, 18436572 is easier to remember than 18736542. And much easier than 15426378.

    So my 21-studder helmet caps, plug wires & homemade timing marks are all set to 18736542, not 15486372, not 18436572 and certainly not 15426378. This helps normal people to remember the firing order should be 18436572 except in the old Ford and even new ones where #4 & #7 are needlessly switched to 18736542.

    Hope this helps to clears up any confusion.



    .


    firingorder.jpg
     
  11. clem
    Joined: Dec 20, 2006
    Posts: 4,672

    clem
    Member

    nope………………...

    but then I can’t figure out why the original post says 8ba firing order and shows an earlier engine………

    I do like your avatar though !
    .
     
  12. flatjack
    Joined: Feb 13, 2007
    Posts: 981

    flatjack
    Member

    Actually on the 8BA water pumps, the pulleys are positioned further out form the engine to give belt clearance.
     
  13. Mr48chev
    Joined: Dec 28, 2007
    Posts: 35,926

    Mr48chev
    ALLIANCE MEMBER

    Back to the original question To do what you are asking.
    Crank the engine over by hand and watch the valves.

    Remember that the four strokes of a 4 cycle engine are intake, compression, power and exhaust.

    You turn it clockwise facing it from the front, Watch the valves and the piston on #1 cylinder. When the #1 intake valve is open the piston shold be going down on the intake stroke, The #1 exhaust valve should be closed, When you hit the bottom of the intake stroke the intake valve will close and you will be on the compression stroke, When you hit the top of the compression stroke you are on top compression and on TDC. Your timing marks should line up. IMG_8262 (2).JPG
     

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