Different 4.6 crank gears??

Discussion in 'General Tech' started by miss.mod.50, Jan 7, 2014.

  1. miss.mod.50

    miss.mod.50 Well-Known Member

    Messages:
    385
    Likes Received:
    2
    Joined:
    May 16, 2013
    Location:
    Central IL
    Until last night I didnt know there are different styles of crank gears. Can someone explain when/why one is used vs the other? The one that came in my Ford Racing kit pushed the chain out over the guides, but i had this other style laying around.

    [​IMG]


    Using top gear:
    [​IMG]

    using bottom gear:
    [​IMG]
     
  2. MustangChris

    MustangChris Well-Known Member SN95 Supporter Retired Staff

    Messages:
    27,361
    Likes Received:
    810
    Joined:
    Aug 20, 2008
    Location:
    Aurora, CO
    woooow. interesting.



    subbed.
     
  3. 96blak54

    96blak54 Well-Known Member

    Messages:
    6,109
    Likes Received:
    10
    Joined:
    Feb 21, 2011
    Location:
    Ky
    The crankshaft timing sprocket changed to a stamped steel design from a powdered metal design. This changed how the crank is machined. The lower looks machined to be adaptable for multiple cranks
     
  4. miss.mod.50

    miss.mod.50 Well-Known Member

    Messages:
    385
    Likes Received:
    2
    Joined:
    May 16, 2013
    Location:
    Central IL
    I have about 6 crank gears sitting here, and all but one are the style of the top gear that came with the FRPP kit, even the older 2 piece crank gears out of a mark 8 have the same spacing as the top gear. I have NOOO idea what the bottom gear came out of, but feel lucky as hell that I had it in my box of random timing parts or i'd have no idea there was even a difference. Normally I can find part differences in a couple google searchs, but coming up empty on this one.
     
  5. duff daddy

    duff daddy Well-Known Member

    Messages:
    8,228
    Likes Received:
    14
    Joined:
    Jun 29, 2008
    Location:
    Boston
    Depending on the crank gears, cylinder heads, blocks and timing pieces will all give you a slight variation, we ran in to something similar with my teksid 2v build
     
  6. MustangChris

    MustangChris Well-Known Member SN95 Supporter Retired Staff

    Messages:
    27,361
    Likes Received:
    810
    Joined:
    Aug 20, 2008
    Location:
    Aurora, CO
    what would be considered safe tolerances on those tensioners?
     
  7. miss.mod.50

    miss.mod.50 Well-Known Member

    Messages:
    385
    Likes Received:
    2
    Joined:
    May 16, 2013
    Location:
    Central IL
    Do you by chance know what the lower gear came out of or where to get one?? What did you run into on your 2v teksid? Thats reason why I'm trying to find what that bottom (grooved) gear is out of.....in case I need one for my 2v teksid/trick flow as well.
     
  8. duff daddy

    duff daddy Well-Known Member

    Messages:
    8,228
    Likes Received:
    14
    Joined:
    Jun 29, 2008
    Location:
    Boston
    I used the 2pc out of a 03/4 cobra, used the orig 96 timing pieces, used the FLAT PRESSED crank trigger wheel, and oe crank gears..
     
  9. miss.mod.50

    miss.mod.50 Well-Known Member

    Messages:
    385
    Likes Received:
    2
    Joined:
    May 16, 2013
    Location:
    Central IL
    Found the answer.....the stepped gear is an "MMR" gear that has to be used on their stroker crank........figures.....sigh
     
  10. MustangChris

    MustangChris Well-Known Member SN95 Supporter Retired Staff

    Messages:
    27,361
    Likes Received:
    810
    Joined:
    Aug 20, 2008
    Location:
    Aurora, CO
    oh. ... learn something new every day.
     
  11. copmagnet

    copmagnet Well-Known Member

    Messages:
    472
    Likes Received:
    12
    Joined:
    Dec 17, 2011
    Location:
    moyock nc/greenbrier VA
    sell dat *****. $$$