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Thread: 4agte piston and conrod question

  1. #11
    Veteran lolwat's Avatar
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    ok mr bigport i got a 7 rib block, would that be a small port bottom end or did the bigports come out with 7 rib too???

    (sorry not trying to hijack its all on topic so why not ask here )

  • #12
    Senior Member mrbigport's Avatar
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    7 rib is smallport, gze, or 20v
    all ran the bigger crank
    slight variations in pistons between weights, design, and materials used but all have the same hole sizes (as far as i know).
    pistons changed between the different variations obviously...otherwise we wouldnt be having this discussion lol
    4agte KE70 263.6whp

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  • #13
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    thank you very much

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    Senior Member sld sho's Avatar
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    what is the beneifit of haveing a 7 rib block apart from beeing able to put gze parts in there, what difference is there if you just get forged pistions and conrods for the other block 40m crank?

  • #15
    Senior Member mrbigport's Avatar
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    its a stronger block - short answer...more ribs give it greater reinforcement against both the internal preasures (especially under boost) and the twisting forces aka torque twist



    this is a photo of a 3-rib 4age.
    http://www.rschita.gr.jp/4ag/image/4ag-002.jpg

    this is a photo of a 7-rib 4age block.
    http://www.aeu86.org/download/4age-7...k/id/12102.jpg

    ultimately its the stronger bot of gear, and its quite obvious once you see the difference in them
    4agte KE70 263.6whp

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    200kws on a stock (so i think) bottom gze end, loves it
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    Quote Originally Posted by mrbigport View Post
    7 rib is smallport, gze, or 20v
    all ran the bigger crank
    Just a little correction:

    you can get 7 rib with big port. They were in early AE92 and very late AE82 and look like:


    That one's been converted to RWD. The difference between them is that bigports are normally black and blue writing on the inlet cam cover but 7 rib bigpot is black and red with smallport being all red writing with spark plug cover further down the valley and not at the top like bigports.
    Last edited by Skylar; 12th May 2011 at 11:12 PM.

  • #18
    Senior Member mrbigport's Avatar
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    fair call, but as a general guide for someone hunting a 7 rib block...
    4agte KE70 263.6whp

    QR Sprint Circuit 1:02.9
    QR Sprint Circuit 60.7 (turbo)
    QR Clubman Circuit 1:06.41 (first outing NA)
    QR Clubman Circuit 1:02.77 (turbo)

    http://www.ae86drivingclub.com.au/fo...ustom-Stickers
    full colour windscreen banners from $45!

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