Engine Theory, Build, Etc Discussion.

Discussion in 'Engine & Transmission Mods' started by BlkCurrantKord, Oct 15, 2007.

  1. BlkCurrantKord

    BlkCurrantKord Super Moderator

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    LoL - Well umm...not really sure what to tell ya cuz I'm not sure what it is your asking. The stroke is how far the rod journal is extended from the main body of the crank. In our case its 97mm, in the case of H22's its 90mm.

    Knife edging doesnt increase or decrease stroke. It narrows or "knife edges" the journals on the crank so that it cuts through the oil in the pan more efficiently w/ less drag.
     
  2. BlkCurrantKord

    BlkCurrantKord Super Moderator

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    If I can get Drew or someone to come over I'll take some pics of this stuff to better explain it. Cuz I've bascially got an entire bottom end of an engine to work with.
     
  3. DarkSideAccord

    DarkSideAccord nadeshiko fobz ftw..

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    wat's a rod journal? :thinking:
     
  4. BlkCurrantKord

    BlkCurrantKord Super Moderator

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    The connecting rods are connected to the crankshaft via the rod journals.
     
  5. xci.ed6

    xci.ed6 Well-Known Member

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    knife edging reduced the weight and drag on the counter weights, and has nothing to do with the stroke.
     
  6. xci.ed6

    xci.ed6 Well-Known Member

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    The crankshaft should never touch the oil in the pan. There is a heavy oil mist in the crank case from oil coming past the main and rod bearings though.

    It is done to the counter weights, not the journals.
     
  7. HandoEX

    HandoEX Well-Known Member

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    What do you guys consider the weakest point of the f23's bottom end?
     
  8. xci.ed6

    xci.ed6 Well-Known Member

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    I've got a D16A6 disassembled on my bench...If I get time I may take some pictures, I have a load of stuff to sell on ebay anyway.
     
  9. turboputz

    turboputz Well-Known Member

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    Well for basics, the rods are connected to the crank and as it spins it moves them up and down. The crank determines the stroke. The stroke is how far the distance is from when the piston is at its lowest position to its highest. To my knowledge the major modifications made to the crank are: knife- edging, micropolishing, and balancing. The goals of these I believe are to reduce rotational mass, reduce bearing wear, and ensure the crank is balanced so that it doesn't get a wobble at high rpms.

    I do not know about mods to the crank that would increase stroke. That is most often done through the use of an aftermarket stroker crank. B16's are stroked to 1.8L 4G63's can be stroked to 2.3L, etc.
     
    Last edited: Oct 15, 2007
  10. BlkCurrantKord

    BlkCurrantKord Super Moderator

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    I know this, just trying to answer one too many questions at once.
     

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