Most liked posts in thread: Engine failure

Page 2 of 2
  1. Williamc

    Williamc New Member

    Nov 23, 2019
    17
    17
    3
    Male
    Ratings:
    +17 / 0 / -0
    #6 Williamc, Nov 30, 2019
    Hi yes I’m in the uk will just do this one again then would have been interesting finding out a bit more about that though
     
  2. MCS02

    MCS02 Moderator
    Staff Member Articles Moderator Supporting Member

    Jul 31, 2009
    11,305
    6,277
    113
    Male
    Ratings:
    +8,070 / 10 / -3
    #8 MCS02, Nov 30, 2019
    What @Minidave said. It will make your mini produce more power, and well you can never go to fast. RMW does make one but once you go down the rabbit hole of modding your mini you will be addicted.:D

    http://store-revolutionmini-com.3dcartstores.com/R56-CNC-Big-Valve-head_p_65.html

    I know I am not helping.......sorry.
     
  3. Williamc

    Williamc New Member

    Nov 23, 2019
    17
    17
    3
    Male
    Ratings:
    +17 / 0 / -0
    #9 Williamc, Nov 30, 2019
    Hi thanks for the reply I replaced all the bolts and torqued them according to auto data seems to have bent all the exhaust valves for some reason
     
  4. Williamc

    Williamc New Member

    Nov 23, 2019
    17
    17
    3
    Male
    Ratings:
    +17 / 0 / -0
    #12 Williamc, Dec 1, 2019
    Hi that would be great if you had those torque settings I don’t think the crank bolt came loose because I put a red paint dot on the bolt and one adjacent on the pulley just as a visual and none of them have moved also the chain is so tight it must have been the cam pulleys that’s moved slightly but can’t understand how it’s just the exhaust valves that bent
     
  5. MCS02

    MCS02 Moderator
    Staff Member Articles Moderator Supporting Member

    Jul 31, 2009
    11,305
    6,277
    113
    Male
    Ratings:
    +8,070 / 10 / -3
    #15 MCS02, Dec 1, 2019
    When I did mine I want 180 deg. I wish I had know about the CravenSpeed part.
     
  6. Minidave

    Minidave Well-Known Member
    Lifetime Supporter

    Dec 22, 2009
    5,640
    4,594
    113
    Male
    Overland Park, Ks
    Ratings:
    +5,186 / 1 / -0
    #21 Minidave, Dec 16, 2019
    Jeff knows his stuff, doesn't he?
     
  7. Jeff10049

    Jeff10049 Member

    Nov 24, 2019
    42
    62
    18
    Male
    Ratings:
    +81 / 0 / -0
    #23 Jeff10049, Dec 18, 2019
    Last edited: Dec 18, 2019
    Well it's good you found the cause but damn I feel for you all that work has to be redone over a misprinted torque spec just sucks. At least you know it'll be good next round.

    Only bent the exhaust because of the way slipping effected valve timing the direction it slipped (Retarded) actually gives the intake more clearance they won't start opening until the piston is down the bore further. But the exhaust will still be open (closing late/retarded) when the piston gets to them.
     
    • Informative Informative x 3
    • List
  8. Williamc

    Williamc New Member

    Nov 23, 2019
    17
    17
    3
    Male
    Ratings:
    +17 / 0 / -0
    #24 Williamc, Dec 19, 2019
    Hi Jeff thanks for the info and the torque settings would you happen to have the torque settings for the cyl head stretch bolts?
     
  9. MCS02

    MCS02 Moderator
    Staff Member Articles Moderator Supporting Member

    Jul 31, 2009
    11,305
    6,277
    113
    Male
    Ratings:
    +8,070 / 10 / -3
    #27 MCS02, Dec 20, 2019
    Great link! Thanks.
     
  10. Williamc

    Williamc New Member

    Nov 23, 2019
    17
    17
    3
    Male
    Ratings:
    +17 / 0 / -0
    #28 Williamc, Dec 20, 2019
    Hi Jeff all has went well so far just the cams to fit and timing to set up on Sunday one thing I did find when I had the head on it’s side was a small spring which I think fell out the hole on the vac pump which mates with the exhaust cam should there be anything else like a ball bearing or just the spring it was oily and a perfect fit for that hole regards willie
     
  11. Jeff10049

    Jeff10049 Member

    Nov 24, 2019
    42
    62
    18
    Male
    Ratings:
    +81 / 0 / -0
    #29 Jeff10049, Dec 21, 2019
    No springs in that area that I have ever seen do you have a picture. Might want to take apart the pump and inspect it. If that thing locks up you'll be doing this again.
     
  12. Jeff10049

    Jeff10049 Member

    Nov 24, 2019
    42
    62
    18
    Male
    Ratings:
    +81 / 0 / -0
    #32 Jeff10049, Jan 27, 2020
    Up and running yet?
     
Page 2 of 2