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lost motion assemblies

Discussion in 'Engine Building' started by civiclxb16, Jan 20, 2005.

  1. civiclxb16

    civiclxb16 Senior Member

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    hey i was talking to one of my boys and he told me that i should look at changing my lost motion assemblies, but he had to go so he didn't explain it to me but i was wondering what exactly is that and what does it do?
     
  2. reckedracing

    reckedracing TTIWWOP VIP

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    Yes, a bad lost motion assembly will cause a valvetrain tapping, and causes the valve clearences to go out of spec much more frequently. As for the oil, the added pressure causes a pin to lock and engage the big lobe.

    Check the operation of the lost motion assembly by pushing on the mid rocker arm. The lost motion assembly should compress fully and operate smoothly through its full stroke. Replace the assembly if it does not work smoothly.

    google search... as to what exactly it does, no idea
     
  3. phunky.buddha

    phunky.buddha Admin with a big stick Admin VIP

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    :readfaq:

    I wrote something up about it in there.
     
  4. phunky.buddha

    phunky.buddha Admin with a big stick Admin VIP

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  5. formby

    formby learning in progress

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    yeah Noob























    just kidding....
     
  6. reckedracing

    reckedracing TTIWWOP VIP

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    ahhhh so sweet

    i feel myself getting smarter
    lol

    nice write up too by the way
    thanks again calesta
     
  7. phunky.buddha

    phunky.buddha Admin with a big stick Admin VIP

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  8. civiclxb16

    civiclxb16 Senior Member

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    http://www.hondaswap.com/forums/index.php?...50295&hl=formby
    :lol: :lol: take that :lol: :lol:

    ok i read the article but what exactly do you know when it is time to replace them? because i have a small tapping sound in my engine but i thought it was the valves tapping
     
  9. phunky.buddha

    phunky.buddha Admin with a big stick Admin VIP

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    You really can't tell if you need to change the lost motion assemblies without opening up the head first. Flip up the rocker arms and press on the LMA with your finger. Press it until it bottoms out. It should feel smooth and bounce back up when you release it. If they don't pop right back up or feel "sticky" then you need to replace them.

    Some people just soak their LMAs in motor oil for a day or two to loosen them up and throw them right back in, but I've never had that work for me- even after soaking them for over a month.
     
  10. civiclxb16

    civiclxb16 Senior Member

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    lol dam a month, ok next weekend i am putting in my cams so i will check it then but i was wondering if my sohc vtec LMA will fit in, since honda wants an arm and a leg for one
     
  11. DelSlo

    DelSlo Senior Member

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    hmm i geuss kinda like doin lifters? i wonder if you can clean them out and then soak em, dont know if varsol would be adequate.... personally im not the person to take the valvetrain apart and soak em and hope it all works, but when im not doin them and someone asks me whos cheap, ill say to do that! haha thanks calesta! :D
     
  12. civicious

    civicious FüK-VTEC VIP

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    I'm thinking :no:
     
  13. civiclxb16

    civiclxb16 Senior Member

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    thinking or know for sure??? :bash: :slap: :hide:
     
  14. civicious

    civicious FüK-VTEC VIP

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    Go ahead and use SOHC D-series LMA's. Have fun. Be sure and let me know how it turns out.


    :tardcart:
     
  15. civiclxb16

    civiclxb16 Senior Member

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    ok ok just asking man :fosho3: :thankyou2: :giveup:
     
  16. phunky.buddha

    phunky.buddha Admin with a big stick Admin VIP

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    I actually think that they're interchangeable... at least in terms of actually fitting into your head. If they can be swapped, I still don't know what the clearance difference is between the B series and D series LMAs.
     
  17. D See 2

    D See 2 Senior Member

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    [​IMG]

    [​IMG]

    I doubt that the d-series will work... especially since there are only 4 per head.
     
  18. phunky.buddha

    phunky.buddha Admin with a big stick Admin VIP

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    I dunno. If it fits, it just has to match the B series' LMAs for height and clearance and they'll work. It doesn't matter if there are only 4- you can always buy more.
     
  19. D See 2

    D See 2 Senior Member

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    Correct, but they do not look the same to me at all.
     
  20. phunky.buddha

    phunky.buddha Admin with a big stick Admin VIP

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    :shrug:

    I'd have to look at them up close. I haven't seen a SOHC VTEC head taken apart before- just B and D non-VTEC. :lol:
     
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