1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Piston to Cylinder head clearance

Discussion in 'Engine Building' started by Utrax42, May 27, 2009.

  1. Utrax42

    Utrax42 New Member

    Messages:
    91
    Likes Received:
    2
    Joined:
    Sep 25, 2008
    My D16Z6 block is bored +.020 over. The block was redecked about .003". I'm running PG6 pistons which sit Zero Decked (and are now about +.003" because of the redecking).
    I'm worried about piston top to cylinder head clearance issues, because the only thing stopping the piston from making contact with the head is the head gasket thickness minus the .003". I can only find head gaskets for my over bore that are .030" thick.
    Is that going to be enough?
    I've read while searching that you want at least .040". Has anyone here ran tighter than this? Thanks!
     
  2. 89' Project Civic

    89' Project Civic d16a6/d16y8 "mini-me"

    Messages:
    736
    Likes Received:
    6
    Joined:
    Mar 3, 2007
    Location:
    St. Catharines, Ontario, Canada
    My suggestion is to buy an adjustable cam gear, that way you can adjust the valves to be right. Also clay your motor, which is from what I hear pretty simple.
     
  3. 89' Project Civic

    89' Project Civic d16a6/d16y8 "mini-me"

    Messages:
    736
    Likes Received:
    6
    Joined:
    Mar 3, 2007
    Location:
    St. Catharines, Ontario, Canada
    Also, don't use a 88-00' Civic Adjustable Cam Gear, us the 92-95' Civic adjustable cam gear is you do get one.
     
  4. Utrax42

    Utrax42 New Member

    Messages:
    91
    Likes Received:
    2
    Joined:
    Sep 25, 2008
    I do have an adjustable cam gear. I'm not worried really about the valves hitting pitons, and I plan on claying just in case.
    I'm worried about the pistons making contact with the actual cylinder head right around the edge where the squish area is. Theoretically speaking it should be fine, but We are talking less than half a millimeter of clearance with a piston traveling at 2000 feet per second. The rods are used and should be stretched already. I guess we will see if nobody has any experience with this. Thanks for the replies though.
     
  5. Utrax42

    Utrax42 New Member

    Messages:
    91
    Likes Received:
    2
    Joined:
    Sep 25, 2008
Verification:
Draft saved Draft deleted

Share This Page