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Forged Steel crank vs. Cast crank

Discussion in 'The Garage' started by mountainexplorer, Jul 21, 2004.

  1. mountainexplorer

    mountainexplorer 1/2 ton status

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    How can you tell if it's a forged steel or not?
     
  2. ben427

    ben427 1/2 ton status

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    Look at the parting line on the flywheel hub,(the place where the two halves of the mold would meet) A cast crank will have a very sharp and fine parting line, but a forged crank will have a wide parting line. /forums/images/graemlins/thumb.gif
     
  3. mountainexplorer

    mountainexplorer 1/2 ton status

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    Thanks. /forums/images/graemlins/thumb.gif I thought I had heard something like that before, but wasn't sure.

    I just looked at the crank that is in question and another one. One has two definite lines, completely opposite of each other. The other one has more like little mounds on either side... no definite line or ridge.
     
  4. SUBFAN

    SUBFAN 1/2 ton status

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    What he said....Go with curtain #2 /forums/images/graemlins/waytogo.gif
     
  5. ben427

    ben427 1/2 ton status

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    Ahh ya bastid! ya got a forged crank, sheit. Im gonna end up buyng a scat 4340 crank i think. /forums/images/graemlins/peace.gif
     
  6. mountainexplorer

    mountainexplorer 1/2 ton status

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    I just pulled a couple rods and pistons out... bearings to copper, some scarring on the crank journals, and the bearings have .040 on them. /forums/images/graemlins/eek.gif

    I thought .030 under was usually max. Looks like I got a steel crank, but it's useless. /forums/images/graemlins/frown.gif
     
  7. ben427

    ben427 1/2 ton status

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    Ahh damn, that blows.
     
  8. mountainexplorer

    mountainexplorer 1/2 ton status

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    Yep, finished the tear down. Mains are .020 under, rods are .040.
     
  9. POWERMAD

    POWERMAD 1/2 ton status

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    You should be able to use it as a core though, that's why I stressed that it was a forged crank and not cast.
    You don't want to turn in a forged crank and get a cast in return. /forums/images/graemlins/wink.gif
     
  10. wasted wages

    wasted wages 3/4 ton status

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    why not have it welded and reground?????
     
  11. CaveBlazin

    CaveBlazin 1/2 ton status Premium Member

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    Forged RULES!!! Its what is going to turn my 383!!
     
  12. leadfoot067

    leadfoot067 1/2 ton status

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    what motor is it alan? if its a small block, then just have it ground down and use a small journal rod.....
     

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