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busted brand new valve

Discussion in 'The Hokey Ass Message Board' started by bgaro, Aug 25, 2013.

  1. Dave50
    Joined: Mar 7, 2010
    Posts: 1,751

    Dave50
    Member

    I`d like to see the whole stem of the valve bgaro if you could.
     
  2. bgaro
    Joined: Sep 3, 2010
    Posts: 1,189

    bgaro
    Member

    here ya go dave, got a better shot of the fracture too.
     

    Attached Files:

  3. spiderdeville
    Joined: Jun 30, 2007
    Posts: 1,134

    spiderdeville
    Member
    from BOGOTA,NJ

  4. spiderdeville
    Joined: Jun 30, 2007
    Posts: 1,134

    spiderdeville
    Member
    from BOGOTA,NJ

    why didn't you just pull the head ?
     
  5. Dave50
    Joined: Mar 7, 2010
    Posts: 1,751

    Dave50
    Member

    Thanks its really hard to see in the pics. I am wondering if valve stuck in guide hit piston and then fractured? If you take another valve and try to slide iit up and down the guide does it do so smoothly no friction. Check the valve stem for signs of gauling. Call me if youd like # is below in sig.



    Also under fingers in pic above is a part # or name on valve.
     
  6. bgaro
    Joined: Sep 3, 2010
    Posts: 1,189

    bgaro
    Member

    i did pull the head, after seeing the impact to the piston, my concern is what else is wrong. i wouldn't be able to sleep at night if i just replaced the valve (OCD maybe?)

    part# 00400 10611 if this means anything
     
    Last edited: Aug 27, 2013
  7. I would pay a visit to your engine builder. HRP

    [​IMG]
     
  8. finn
    Joined: Jan 25, 2006
    Posts: 764

    finn
    Member

    Look at the valve head seating area (machined face)in your third picture.

    That valve was flying when it hit the seat to deform that much.

    Case closed.

    See your builder
     
  9. bgaro
    Joined: Sep 3, 2010
    Posts: 1,189

    bgaro
    Member

    sealed power
     
  10. thanks, mine are from Elgin...but they are all probably made in the same offshore factory
     
  11. 61 chevy
    Joined: Apr 11, 2007
    Posts: 891

    61 chevy
    Member

    if they are new, call sealed power, for warranty,
     
  12. Engine man
    Joined: Jan 30, 2011
    Posts: 3,476

    Engine man
    Member
    from Wisconsin

    I was looking at that too but can't be certain it isn't the picture. The valve would have to be pretty soft to deform so quickly.

    I'm interested in this valve closing velocity problem. Does it take out all 16 valves?

    I've always tried to get valves to close as fast as possible and have used some very strong double and triple springs to do it and stop them from bouncing off the seat at 8,000 rpm and higher with solid lifter cams. If the valve is closing too fast at 3,300, it should have been more of a problem at more than twice that speed in a GM 302 with the infamous Duntov camshaft with .030 lash. As I said above, I've had almost everything else in the valve train break but never a valve at the top of the stem. Guess I've just been lucky.
     
  13. Dave50
    Joined: Mar 7, 2010
    Posts: 1,751

    Dave50
    Member

    That valve stem seems to have a alot of wear for a new valve. I will havce to go back and read your Original post
     
  14. finn
    Joined: Jan 25, 2006
    Posts: 764

    finn
    Member

    Should be ok as long as the valve is seating on the ramp and not on the flank of the cam profile. The engines I was referring had cams and valvetrains designed for 4200 rpm no follow speeds and hydraulic roller lifters. The cams had some pretty high accelleration rates but ramps designed for reasonable seating velocities.
     
  15. bgaro
    Joined: Sep 3, 2010
    Posts: 1,189

    bgaro
    Member

    just heard back from the machine shop, he found another valve that was fractured. he seems to think there is some clearance issues going on. plan is to redo the heads, the piston looked worse than it is and can be saved. i figure while hes at it open up the intake side.......why not, then i can feel like i've made progress.
     

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