Page 1 of 3 123 LastLast
Results 1 to 10 of 27

Thread: Dropped a valve

  1. #1
    Senior Member MASTER BUILDER
    Join Date
    Nov 2005
    Location
    Mobile,Al.
    Posts
    127

    Dropped a valve

    Dropped a valve on my fresh built 540.The exh. valve on #2 cyl. broke about 3/4 of a inch down the stem.?Wtf.Ferrea 6000 series valves,4.5 bore with 4.250 stroke,rhs heads,lun cam 740 exh 758 int lift.Put a new radiator in the car and was in the shop checking the car fired it up and ran it for 8-10 minutes only got to 150,so got out of the car and started checking for leaks,bliped the gas by hand a couple of times to help put a little more heat in it,sounded funny so jumped back in the car to check oil psi it was 55,hit the gas one more time(dumb ass)to clear it up when it came back to idle,it locked up.!!

    Never seen one break at the stem like that,zero passes on the motor,only shop time may be an hour and half of run time.one pass down the local road in front of the house,it saw 6000 rpm on that pass,but lots of run time after that.Roller cam and howards roller rockers crower roller lifters all brand new.pulled the heads and the others 7 cylinders are happy,No contacts marks on any other valves or the pistons.WTF??
    Go Fast_Have fun

    Greg Farmer

  2. #2
    Senior Member RACING JUNKIE
    Join Date
    Sep 2007
    Posts
    4,143
    I know this isn't helpful and you are looking for a cause, but I will still say it anyway.

    Dude...that f*&*ng sucks. Your luck is about as good as mine. Did it just break or did it break because it dropped and got smashed? How much damage to the block and head?

  3. #3
    Senior Member MASTER BUILDER
    Join Date
    Nov 2005
    Location
    Mobile,Al.
    Posts
    127

    valve

    If it wasn't for bad luck,wouldn't have any luck.!!!!!,Don't think i can save the head(brand new) piston has several holes in it,(brand new) and yes it looks like the stem broke and then the valve dropped.never seen one break at the stem like that before.As i said before the other seven cylinders are happy,and look great.Beats me?The valve spring came off with the stem still in place with the keepers ,and retainer all in one piece.!!! go figure. ops:
    Go Fast_Have fun

    Greg Farmer

  4. #4
    Senior Member RACING JUNKIE
    Join Date
    Sep 2007
    Posts
    4,143
    I never lost one that new but I broke a lifter after 21 or 22 passes and lost the block and all..so I know how it feels.

  5. #5
    Senior Member RACING JUNKIE
    Join Date
    Mar 2003
    Location
    Fountain,MICHIGAN
    Posts
    856

    Valve?

    1st Thing I would check?
    Coil Bind on the Rest of the Valves?They DONT jsu Break,for NO Reason?
    Who set the Heads Up?
    I would'nt see why the Head cant be Saved?
    I have had them come apart at 9000 in the Lights and,a little Dye Grinder Action,Some Alu.Tig work,a few New Seats and Valves.And back at it!
    If it broke at a Idle,IT CANT BE TO BADDD!
    Later
    G 8)

  6. #6
    Senior Member DYNO OPERATOR
    Join Date
    Aug 2007
    Location
    Lost Creek, WV
    Posts
    533

    Re: Dropped a valve

    Quote Originally Posted by contagious
    Dropped a valve on my fresh built 540.The exh. valve on #2 cyl. broke about 3/4 of a inch down the stem.?Wtf.Ferrea 6000 series valves,4.5 bore with 4.250 stroke,rhs heads,lun cam 740 exh 758 int lift.Put a new radiator in the car and was in the shop checking the car fired it up and ran it for 8-10 minutes only got to 150,so got out of the car and started checking for leaks,bliped the gas by hand a couple of times to help put a little more heat in it,sounded funny so jumped back in the car to check oil psi it was 55,hit the gas one more time(dumb ass)to clear it up when it came back to idle,it locked up.!!

    Never seen one break at the stem like that,zero passes on the motor,only shop time may be an hour and half of run time.one pass down the local road in front of the house,it saw 6000 rpm on that pass,but lots of run time after that.Roller cam and howards roller rockers crower roller lifters all brand new.pulled the heads and the others 7 cylinders are happy,No contacts marks on any other valves or the pistons.WTF??
    Did it break just below the lock groove?

    TS1955

  7. #7
    Senior Member MASTER BUILDER
    Join Date
    Nov 2005
    Location
    Mobile,Al.
    Posts
    127

    valve

    Did it break just below the lock groove?

    Yes ,the peice of stem left in the keeper and retainer was about 3/4 inch long.
    Go Fast_Have fun

    Greg Farmer

  8. #8
    Senior Member EXPERT BUILDER gearhead1011's Avatar
    Join Date
    Jan 2004
    Location
    Shepherdsville, KY
    Posts
    313
    It's possible the rocker geometry is off. If the roller was rolling too close too or off the edge of the valve the side load could have broke the stem in the area you're describing.

  9. #9
    Senior Member MASTER BUILDER
    Join Date
    Nov 2005
    Location
    Mobile,Al.
    Posts
    127

    valve

    It's possible the rocker geometry is off. If the roller was rolling too close too or off the edge of the valve the side load could have broke the stem in the area you're describing.


    I will check this very close when i put it back together.
    Go Fast_Have fun

    Greg Farmer

  10. #10
    Senior Member DYNO OPERATOR
    Join Date
    Aug 2007
    Location
    Lost Creek, WV
    Posts
    533
    Quote Originally Posted by gearhead1011
    It's possible the rocker geometry is off. If the roller was rolling too close too or off the edge of the valve the side load could have broke the stem in the area you're describing.
    I agree!

    TS1955


Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Email us - Support@RacingJunk.com
Call us - 866.326.9227
Copyright © 2005-2016 RacingJunk.com All Rights Reserved.

Designated trademarks and brands are the property of their respective owners. Use of this Web site constitutes acceptance of the RacingJunk.com
Terms of Use, Classifieds Disclaimer, Privacy Policy, and Cookie Policy