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floating wrist pins.

Discussion in 'Engine Building' started by Arachnid, Sep 17, 2004.

  1. Arachnid

    Arachnid Senior Member

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    ok, i need concrete info. on what is supposed to be what. i'm putting dohc zc pistons into my y8 block and i have people telling me that the wrist pins float in the piston and pressed into the rod. and then i have people telling me vise versa...wth. anyone know what's true and please share why to back it up instead of a simple yes or no answer. thanks!
     
  2. pissedoffsol

    pissedoffsol RETIRED

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    dont know if they float, but they are definitly pressed in
     
  3. UDT

    UDT Senior Member

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    I know that you suposeddly gain a hp or 2 by having floating wrist pins.
     
  4. 97CTR

    97CTR Senior Member

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    I always thought that floating meant that they were held in place by spiralocks or the like. And that being pressed in they are not floating. But I may be wrong.
     
  5. Arachnid

    Arachnid Senior Member

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    ok, no pics. the zc pistons that i have have holes in them. in the middle of where the wrist pin sits on both sides. are they oil passages or pin lock thingys. heres a notion, if i wipe off the grease from the wrist pins they in won't go into the piston anymore.

    about the horse thing. thanks man that's the answer i'm looking for. "floating wrist pins give me hp............and a scored up cylinder wall too!!!

    i was just trying to get some good concrete answers from people who's done this before so when i open up my block i'll know what's supposed to be what. but it seems people are......
     
  6. 97CTR

    97CTR Senior Member

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    holes that go to the wrist pins are oil passages, stock honda pistons are pressed on they are not floating.
     
  7. Arachnid

    Arachnid Senior Member

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    if they need to be pressed on then why do you still need the oil passage. it doesn't make any sense. everybody is telling me mixed things. raaaah.
     
  8. MikeBergy

    MikeBergy Blah blah blah....

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    Here you go. The stock wrist pins are pressed into the rod, but the pistons float freely on the pin. If it wasn't floating on either the piston or the rod, the piston would not be able to go up and down the cylinder without getting seriously messed up. Fully floating wrist pins are not pressed in, and therefore are called fully floating pins.
    Now for the oil passage question. How the hell else do you think oil gets pumped up into the oil ring? If you didn't have a way of getting oil into the oil ring, the rings would get so hot they would melt to the side of the cylinder wall. Not to mention the wristpin/piston bearing surfaces need to be lubricated, or else you would have some major rubbing going on. Hope this helps. When in doubt tear the block apart and study it for a while. It's actually real genius how they get oil up in places. At least I was amazed. I don't see how fully floating wrist pins will add hp, unless they weigh a hell of a lot less, and are just decreasing the reciprocating mass.
     
  9. Arachnid

    Arachnid Senior Member

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    i meant if the wrist pin was to be pressed on to the piston then the oil passage would be useless....now, it makes alot more sense now that it's all figured out. rod = no float, pistons = float with oil. all you guys that has built engines before should've known this stuff. jeez lol.
     
  10. MikeBergy

    MikeBergy Blah blah blah....

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    pwned :p

    But hey, just went out and looked at my b16 block this morning to make sure I didn't say anything false. The oil squirters on the b16 seem to be the only oil getting up into the cylinder walls, so I retract the whole pumping idea. It seems that the only way oil gets up into the cylinder walls is by those squirters and by the crank windage. The only hole that I saw was the bored out "hole" going straight through the wrist pin. There is no way that can be an oil passage, because there is no source of oil pressure going to it. Seems to be just an area honda saw fit to reduce reciprocating mass.
     
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