Piston Slap

Discussion in 'Old's Cool' started by alyef, Dec 1, 2004.

  1. alyef

    alyef Bikeless

    Joined:
    Dec 25, 2002
    Oddometer:
    308
    Location:
    35.8N 78.8W
    Gents,

    What is piston slap and what causes it?
    #1
  2. markjenn

    markjenn Long timer

    Joined:
    Nov 9, 2003
    Oddometer:
    10,506
    Location:
    Swellvue, WA
    There is a natural tendency for the piston to cock to one side near the bottom of the stroke. If there is too much clearance between the piston skirt and the cylinder, the piston will slap back and forth in the bore making a noise. All engines do it to some degree, but when it gets to the point where it is quite audible, you usually have a problem. Two-strokes are more susceptible.

    - Mark
    #2
  3. Gruebane

    Gruebane Pawn Star

    Joined:
    Jul 1, 2004
    Oddometer:
    996
    Location:
    Johannesburg,South Africa
    As he said , just to add that its more common when engine is cold , when warm the slap should reduce.

    cheers
    #3
  4. alyef

    alyef Bikeless

    Joined:
    Dec 25, 2002
    Oddometer:
    308
    Location:
    35.8N 78.8W
    Thanks gents!
    #4