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Thread: 100kw crank and 83 kw crank

  1. #1
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    Default 100kw crank and 83 kw crank

    hey guys does any one know or has done a 83 kw crank on a 100kw block?
    just budget issues...

  2. #2
    Veteran timbo's Avatar
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    im sure it would work, hopefully one of the ae86dc toyota super nerds* can confirm!

    *no disrespect just pure jealousy!

  3. #3
    Moderator Sam-Q's Avatar
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    no it wont work, different big end sizing, you need to change the rods and pistons too
    My website: SQ Engineering - 4AGE and 3SGE upgrade/replacement parts

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  4. #4
    Veteran timbo's Avatar
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    so sam are you saying that in order to use a bigport head on a smallport bottom you have to use all the smallport internals? is there anything that is interchangeable?

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    The mains are all the same size on all 4age cranks. The big ends change between a bigport and smallport. In order to put a bigport crank into a smallport block, you also need the bigport rods and pistons. The other main problem is if the 7rib block has oil squirters, the bigport pistons will probably hit them (may need them removed/blocked).

    Btw its 86kw not 83kw
    1983 AE86 ADM rust spec goodness track car build - end of the road
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  6. #6
    Moderator Sam-Q's Avatar
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    yes thats right, but as above you need to put a file onto the pistons to make room for the squirters. Not hard to do but you will need some drug scales to match the weights after the mods. Everything else should be a match, in the bottom end anyway.
    My website: SQ Engineering - 4AGE and 3SGE upgrade/replacement parts

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  7. #7
    Veteran blair's Avatar
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    you would use the smallport internals anyway for the higher compression

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    yer what blair said

    if you are going to the hassle of putting different intanls in it will prolly cost you more than a complete smallport/20v bottom end.

    if you factor in machining for the parts you are trying to assemble (linish, new bearings...whatever else....)

    just try and find a complete "100kw" bottom end and dont open it up.
    In faith there is enough light for those who want to believe and enough shadows to blind those who don't.
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  9. #9
    Moderator Sam-Q's Avatar
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    exactly right, unless you have a real good reason like it having aftermarket parts already
    My website: SQ Engineering - 4AGE and 3SGE upgrade/replacement parts

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  10. #10
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    i thought the heads would be interchangeable without changing any internals???

    or are the valve flycuts totally different?

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