CHOP CULT HOME
Email Password
Search
  1. #1
    Senior Member

    Content on this page requires a newer version of Adobe Flash Player.

    Get Adobe Flash player


    Join Date
    Sep 2013
    Posts
    198

    Default Cylinder bore time estimate

    Short story, I need my cylinders bored out to 20 over. Local shop is giving me an estimate of 2 hours shop time to complete said task. Never had this done before. Am I getting worked over here or is this about average? They were 10 over before taking them in but I broke the lands off my front piston and they need to bored out.

    Thanks in advance.

  2. #2
    Senior Member

    Content on this page requires a newer version of Adobe Flash Player.

    Get Adobe Flash player


    Join Date
    Sep 2010
    Posts
    306

    Default

    whats 2 hrs of shop time? i would think anywhere between 150-200 would be fair for a GOOD machinist to do it right

  3. #3
    Senior Member

    Content on this page requires a newer version of Adobe Flash Player.

    Get Adobe Flash player


    Join Date
    Sep 2013
    Posts
    198

    Default

    $80/hr. So $160. I'm fine paying it if that's what it takes, I just want it to be done well and for the bike to ride solid for the next several thousand miles. Thanks for the reply.

  4. #4
    Senior Member

    Content on this page requires a newer version of Adobe Flash Player.

    Get Adobe Flash player


    Join Date
    Apr 2010
    Posts
    2,426

    Default

    That's a honest solid estimate, takes time to set up.

  5. #5
    Senior Member

    Content on this page requires a newer version of Adobe Flash Player.

    Get Adobe Flash player


    Join Date
    Sep 2013
    Posts
    198

    Default

    Thanks for the feedback!

  6. #6
    Senior Member

    Content on this page requires a newer version of Adobe Flash Player.

    Get Adobe Flash player


    Join Date
    Apr 2013
    Posts
    9,566

    Default

    Who determined that .020"/current plus .010" will clean it up, you or the shop?

    .010" steps don't always remove all the taper so be sure before buying pistons.

  7. #7
    Senior Member

    Content on this page requires a newer version of Adobe Flash Player.

    Get Adobe Flash player


    Join Date
    Sep 2013
    Posts
    198

    Default

    I haven't purchased any pistons yet. I'm waiting to see what the shop comes back with after they bore. 20 over was an estimate. Thanks for the feedback.

  8. #8
    Senior Member

    Content on this page requires a newer version of Adobe Flash Player.

    Get Adobe Flash player


    Join Date
    Apr 2013
    Posts
    9,566

    Default

    Pistons are normally fitted by honing the cylinder to size after boring, so best quality work is done with pistons and rings in-hand.

    Desired piston clearance to cylinder determines bore
    , and once bored, piston ring end gaps must be checked and gap set if not within limits.

    Just be sure you and the machine shop are on the same page.

  9. #9
    Senior Member

    Content on this page requires a newer version of Adobe Flash Player.

    Get Adobe Flash player


    Join Date
    Mar 2010
    Posts
    156

    Default

    0.020" over or .080 over is still the same amount of time... 2 hours is actually pretty quick... takes time to set up the machine, inspect the cylinder walls before and after punching them out, then it takes time to hone them... all in all it usually takes closer to 3 hours to do it right (for a single cylinder)...

  10. #10
    Senior Member

    Content on this page requires a newer version of Adobe Flash Player.

    Get Adobe Flash player


    Join Date
    Sep 2013
    Posts
    198

    Default

    Thanks for the feedback everyone, I appreciate it! I wasn't intending to get in to the engine with this build(my first) so I'm finding myself in new territory. Great learning experience though! Thanks again.

Share This



Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Log in

Log in