Register and gain access to Discussions, Reviews, Tech Tips, How to Articles, and much more - on the largest Large Scale RC community for RC enthusiasts that covers all aspects of the Large Scale RC!

Register Today It's free! This box will disappear once registered!

To shim or not to shim that is the question

Discussion in 'HPI Baja' started by FastEddy, Mar 4, 2007.

  1. FastEddy

    FastEddy Well-Known Member
    LSF vendor

    Joined:
    Feb 15, 2007
    Messages:
    432
    Likes Received:
    0
    Location:
    Sonoma County CA
    I just took apart my clutch to check it out. When putting everything back together, I noticed there is an amount of play on the end of the bell that I believe id a bit to much.Im sure the play isn't going to hurt anything but Im a bit anal.

    Are there any reasons I should leave the end play there and not shim it out?
     
  2. Timmahh

    Timmahh Bajastafarian Madnes
    PLUS member

    Joined:
    Feb 15, 2007
    Messages:
    3,374
    Likes Received:
    1
    Location:
    Michigan
    only thing i can think of is additional heat from friction if its a bit to snug.
     
  3. FastEddy

    FastEddy Well-Known Member
    LSF vendor

    Joined:
    Feb 15, 2007
    Messages:
    432
    Likes Received:
    0
    Location:
    Sonoma County CA
    Its at about .68mm including the rust on my feeler gauges.
    I may do .5mm just to keep it aligned with the spur.
     
  4. Timmahh

    Timmahh Bajastafarian Madnes
    PLUS member

    Joined:
    Feb 15, 2007
    Messages:
    3,374
    Likes Received:
    1
    Location:
    Michigan
    i would think that would be plenty of clearance. if it does get hot. the pinion heatsinks should be available any day now.
     
  5. Yamadude

    Yamadude Well-Known Member

    Joined:
    Feb 18, 2007
    Messages:
    216
    Likes Received:
    0
    Location:
    S.E Michigan
    Thats what I did .5mm is what I used and no problems so far with heat or wear.
     
  6. TurtleRacing

    TurtleRacing Well-Known Member

    Joined:
    Feb 15, 2007
    Messages:
    137
    Likes Received:
    0
    Location:
    S.E. Michigan
    When I started making bells I almost took that clearance out but got nervous about it. Could never figure out why HPI left that much clearance & the only thing I could think of was manufacturing tolerance on their part, so I left it just in-case. I figured that way people could shim if they wanted to.
     
  7. microDan

    microDan Member

    Joined:
    Feb 21, 2007
    Messages:
    14
    Likes Received:
    0
    Location:
    NJ
    Clearances in HOT parts are to allow for thermal expansion. So just keep that in mind. Everything also around and connected to the clutch will grow. So the clearances are compounded by other parts, man you want to talk about anal (Me)........
     
  8. phatdad

    phatdad Active Member

    Joined:
    Feb 19, 2007
    Messages:
    41
    Likes Received:
    0
    Location:
    San Diego.CA.Ramono.
    shim it.after a hard run and the bell was hot the end play was still there.
     
  9. beerman525

    beerman525 Well-Known Member

    Joined:
    Feb 19, 2007
    Messages:
    61
    Likes Received:
    1
    Location:
    waterford michigan
    shim it if you want or leave it alone thats whats good about this hobby your own touches . like burger king have it your own way lol.