J&P Cycles Technical Forums

Come participate in our American V-Twin and Metric motorcycle tech forums
Welcome to J&P Cycles Technical Forums Sign in | Join | Help
in Search
Latest post Sun, Jun 24 2018 12:29 PM by CLIFF17. 4 replies.
Page 1 of 1 (5 items)
Sort Posts: Previous Next
  • Sun, Jun 24 2018 9:37 AM

    • CLIFF17
    • Not Ranked
      Male
    • Joined on Sun, Jun 24 2018
    • Posts 4

    Custom engine builded using sporster cams

    Need  cams  specs. for these  cylinder & head specs.   I not going to use the 6.1 pistons . Thinking  of using custom builded   9.1  pistons?

    cylinder & head specs. Continental R670 radial,

    two spark plugs for one cylinder
    191" displaces
    3129cc,
    bore 5.125
    stroke 4.625
    Compression ratio: 6.1 80 Octane,

    pistons are flat top land is at 0

    no head gasket

    lobe hight is 3.22
    Valve lift  5.00 in.& ex.
    Valve both size 2.250 in.
     4-cam engines running the 86-90 XL style cams

     

     

  • Sun, Jun 24 2018 11:19 AM In reply to

    • FX
    • Top 10 Contributor
      Male
    • Joined on Sun, Mar 12 2006
    • Tonawanda NY
    • Posts 5,201
    • Moderator

    Re: Custom engine builded using sporster cams

    Cliff, nice to have ya here. Wow what an engine, looks kinda like a knuckle on steroids. This is an aricraft engine, right? I doubt you'll be able to use any kind of standard specs on that engine. Maybe Sfranta will have some ideas...

    FX

    Don't force it, get a bigger hammer.

  • Sun, Jun 24 2018 11:23 AM In reply to

    • CLIFF17
    • Not Ranked
      Male
    • Joined on Sun, Jun 24 2018
    • Posts 4

    Valves and timing for W670 Cylinders& Heads

  • Sun, Jun 24 2018 11:47 AM In reply to

    • CLIFF17
    • Not Ranked
      Male
    • Joined on Sun, Jun 24 2018
    • Posts 4

    Re: Valves and timing for W670 Cylinders& Heads

     

  • Sun, Jun 24 2018 12:29 PM In reply to

    • CLIFF17
    • Not Ranked
      Male
    • Joined on Sun, Jun 24 2018
    • Posts 4

    Using Andrews cam as a bace line ?

     Using  Andrews cam as a baceline it has a .500 push rod leight  the same the W670 valve train

     Sporster EV Cam Instructions - '86 and Laterheads

    Grind Timing Duration Valve Lift Spring Travel Springs Lift @ TDC
    V6 34/50 264 .500 .530 Stock .241 N6 56/28 264 .500 .530 - .212

Page 1 of 1 (5 items)