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Sbc w/lake style headers popping sound on passenger side?

Discussion in 'The Hokey Ass Message Board' started by LowMOJO, Oct 24, 2012.

  1. LowMOJO
    Joined: Mar 6, 2007
    Posts: 522

    LowMOJO
    Member

    Only on acelaration on slow speeds. Makes a popping sound thru right side header? No loss of power. No oil leaks. Checked for exhaust leak and found none? Bad wire/plug? Ideas lemme know thanx!

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  2. Dane
    Joined: May 6, 2010
    Posts: 1,352

    Dane
    Member
    from Soquel, CA

    Check for intake leak with starting fluid around the intake manifold.

    Compression check on that side.
     
  3. Mad Mouse
    Joined: Apr 1, 2007
    Posts: 93

    Mad Mouse
    ALLIANCE MEMBER

    Check for bad plug wire. Old or "cheap" plug ores allow spark to jump mom wire to wire. Just a posibility.
     
  4. RHOPPER
    Joined: Mar 12, 2006
    Posts: 263

    RHOPPER
    Member

    What Dane said. I just had a vortec intake leaking oil from the lifter valley. Couldn't figure out why the exhaust sounded funny untill it started using oil and fouling two plugs. Fixed the intake with new gaskets, exhaust sounds fine again.
     

  5. LowMOJO
    Joined: Mar 6, 2007
    Posts: 522

    LowMOJO
    Member

    Cool. Thanx guys for all the help gonna look into it this weekend. Hopefully its just a plug or intake leak. Any other suggestions/advice?

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  6. Blue One
    Joined: Feb 6, 2010
    Posts: 10,682

    Blue One
    ALLIANCE MEMBER
    from Alberta

    Just wondering, is it possible that a slightly burned valve can cause the popping?
     
  7. greg32
    Joined: Jun 21, 2007
    Posts: 2,057

    greg32
    Member
    from Indiana

    You sure you dont have a header gasket leak?
     
  8. Some of them are hard to find. I would get someone to hold a rag over the pipe tightly and listen at the flange. With it running of course, should only take a few seconds to find the leak if there is one.

    Telltale signs of a gasket leak are white-grey streaks on the head surface around the gasket, may be hard to find it it blows out on the bottom side of the flange.

    Bob
     
  9. LowMOJO
    Joined: Mar 6, 2007
    Posts: 522

    LowMOJO
    Member

    Well I changed out the header gaskets a few days ago and still had the popping noise. But you can't hear it on idle. Only on acelaration. Like taking off from a complete stop it starts when the motor is shifting thru its rpms. I'd say between 20-35mph is when its the loudest and consistent with the engine. At highway speeds it fades out. Only time I can hear it is when the engine is slowing down from a higher rpm on the highway.

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  10. F&J
    Joined: Apr 5, 2007
    Posts: 13,217

    F&J
    Member

    Some symtoms sound like a worn cam lobe. Only takes a few minutes to check.
     
  11. 1971BB427
    Joined: Mar 6, 2010
    Posts: 5,895

    1971BB427
    Member
    from Oregon

    Might be a fouled spark plug. I'd check the plugs first, it's cheap.
     
  12. greg32
    Joined: Jun 21, 2007
    Posts: 2,057

    greg32
    Member
    from Indiana

    What brand of headers do you have?
     
  13. LowMOJO
    Joined: Mar 6, 2007
    Posts: 522

    LowMOJO
    Member

    @greg32 I have the speedway lakestyle headers

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  14. Good idea, tackle the free 'n easy stuff first. Look for a bad wire (look at it at night to rule arcing), throw a vacuum gauge on it, look for a bouncing needle.

    Bob
     
  15. propwash
    Joined: Jul 25, 2005
    Posts: 3,858

    propwash
    Member
    from Las Vegas

    last car I had that made a popping noise that like that turned out to have a burnt valve.
     
  16. Blue One
    Joined: Feb 6, 2010
    Posts: 10,682

    Blue One
    ALLIANCE MEMBER
    from Alberta

    Well there it is, I thought that was a distinct possibility.
     
  17. LowMOJO
    Joined: Mar 6, 2007
    Posts: 522

    LowMOJO
    Member

    Changed out the header gaskets to rule them out. Did notice that last valve looked white? Compared to the other 3 . Can that be and indication of a burnt valve?

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  18. certainly an indication of a lean cylinder - that would make it pop out the header
     
  19. LowMOJO
    Joined: Mar 6, 2007
    Posts: 522

    LowMOJO
    Member

    What could cause that?

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  20. describe your induction system to us, maybe something is up with carb(s)? Could be a vacuum leak on that intake runner, dirty jet in the carb, lots of stuff.
     
  21. LowMOJO
    Joined: Mar 6, 2007
    Posts: 522

    LowMOJO
    Member

    307 stock sbc rebuilt about 2years ago running a batwing repo air cleaner with 4 barrel eldebrock 650 cfm carb, regular hei distribuitor, reg plugs and wires and performer intake manifold.

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  22. vivalahotrod
    Joined: May 6, 2007
    Posts: 743

    vivalahotrod
    Member

    It`s funny that this has come up.
    I was out in my buddies duece and it was popping out the driverside. He`s running a 6-pac (but only running off the center carbs) with points. I think his carbs are toast and need rebuild. I don`t think the open lake headers are helping any thing either.

    Viva
     
  23. I would pull the intake and replace the gaskets to start.
     
  24. LowMOJO
    Joined: Mar 6, 2007
    Posts: 522

    LowMOJO
    Member

    K thanx

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  25. LowMOJO
    Joined: Mar 6, 2007
    Posts: 522

    LowMOJO
    Member

    Culprit = 2 burnt valves! Oh well time to go to the maqchine shop!
     
  26. Devin
    Joined: Dec 28, 2004
    Posts: 2,352

    Devin
    Member
    from Napa, CA

    I know this probably sounds like a stupid question to some, but what exactly burns on the valve ? aside from the symptoms, how does this adversely affect the engine? Thanks


    Posted from the TJJ App for iPhone & iPad
     
  27. cigarcaptain
    Joined: Jun 11, 2009
    Posts: 43

    cigarcaptain
    Member

    The valve face itself burns away, so valve is no longer round and doesnt seal. usually due to a worn valveguide. The guide gets egg shaped and the valve doesnt always come back down in its seat. When the exlosion happens it burns away the exposed face of the valve. Hope this helps
     
  28. Devin
    Joined: Dec 28, 2004
    Posts: 2,352

    Devin
    Member
    from Napa, CA

    Thanks cigarcaptain, this makes sense.. I am surprised the valves could deteriorate that much. What is it about lakes headers that could exacerbate this problem? Sorry to th OP for hijacking.
     
  29. LowMOJO
    Joined: Mar 6, 2007
    Posts: 522

    LowMOJO
    Member

    No problem. I was wondering the same thing*

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  30. I wouldn't say the tube manifolds exacerbate the problem - just more noticeable with them.
     

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