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Technical PCV Valve with no oil filler neck breather... Thoughts?

Discussion in 'The Hokey Ass Message Board' started by harris73085, Jan 27, 2017.

  1. harris73085
    Joined: Feb 4, 2009
    Posts: 151

    harris73085
    Member

    I know there are a lot of threads on here that touch on this topic, and I have searched a lot of them and can't find the answer I'm looking for. I have '62 SBC that I am running a PCV valve out of the back of the block to the carb with no oil filler neck filter. To be truthful, I have no oil filler neck. My question is will this set up work? Am I going to run into unexpected crank case pressure and create leaks? If there is already a thread that answers this, please point me in that direction.

    Thank you,
     
  2. 56shoebox
    Joined: Sep 14, 2011
    Posts: 1,106

    56shoebox

    Where do you add your oil to your engine? I assume you remove a cap of some sort from a valve cover, pour in oil and replace the cap. Replace the cap (It may have OIL or 710 written on it already) and replace it with a filtered breather. A lot of people put a filtered breather in one valve cover and the pcv valve in the other valve cover.
     
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  3. Jacob helms
    Joined: Nov 28, 2016
    Posts: 103

    Jacob helms
    Member

    Well from what i know the only problem would be trying to get oil in it.

    Sent from my LGLS740 using The H.A.M.B. mobile app
     
  4. mopar362000
    Joined: Feb 14, 2008
    Posts: 88

    mopar362000
    Member

    If you running it back to where the roaddraft tube would have it will fine.Do you still have canister under intake.Jmmie King
     
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  5. Fordors
    Joined: Sep 22, 2016
    Posts: 2,621

    Fordors
    Member

    With a PCV valve you will need a supply of fresh air into the crankcase to properly vent. Sounds like you have either a later model intake or an aftermarket one with no hole for the oil fill. I'd get a set of stock valve covers that have the internal baffles and add a breather. As an alternative you could add Moon, or Offenhauser style aluminum breathers to your covers.
     
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  6. squirrel
    Joined: Sep 23, 2004
    Posts: 45,219

    squirrel
    Member

    You need a different intake,or different valve covers.
     
    LOU WELLS likes this.
  7. The method of attaching the crankcase vent to the carb base as you have described is fine. This will pull the air out of the engine crankcase, but how will the "replacement" air get in?

    Basically your milkshake straw is clogged.
     
    pat59 likes this.
  8. harris73085
    Joined: Feb 4, 2009
    Posts: 151

    harris73085
    Member

    I have original turbo fire valve covers with no breather or cap. As said above by Fordors, I have an aftermarket intake that came with the engine that isn't drilled for the oil filler neck.
     
  9. harris73085
    Joined: Feb 4, 2009
    Posts: 151

    harris73085
    Member

    This is what i'm worried about. Will that cause any unforseen problems, or do I have to change intake, or drill out the one I have, or will everything be ok as is.
     
  10. Fordors
    Joined: Sep 22, 2016
    Posts: 2,621

    Fordors
    Member

    It is possible to use a hole saw and modify the intake, if you want to keep your present valve covers that is the route I'd take.
     
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  11. 56shoebox
    Joined: Sep 14, 2011
    Posts: 1,106

    56shoebox

    Early 62 sbc. What are "turbo fire" valve covers? How do you add oil to your motor if there no openings in your valve covers or intake manifold?
     
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  12. miller
    Joined: Aug 5, 2006
    Posts: 474

    miller
    Member
    from New Jersey

    ...look at the attached pic the cap on the valve cover has a filter in it,..the other valve cover has the pcv valve in it,...this set up has been running like it for about 6 years now,...miller
     

    Attached Files:

  13. slowmotion
    Joined: Nov 21, 2011
    Posts: 3,173

    slowmotion
    Member

    Sounds like the present setup provides no way to add oil (stamped v/c's, no oil tube intake),that's your first problem. When you figure out where to add oil, put a baffled breather cap there.
     
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  14. Fordors
    Joined: Sep 22, 2016
    Posts: 2,621

    Fordors
    Member

    Many have removed a valve cover to add oil, all depends what the equipment on the engine is and how resourceful you are.
    But really, all this is just a thread hi-jack.
     
  15. Problems indeed. The air needs to enter the block before it can be pulled out. And if it isn't pulled out you get moisture and all other sorts of nastiness in your engine. As mentioned above, vent the valve covers or the intake to allow air into the crankcase.

    A valve cover swap would be the easiest fix.
     
  16. Mr48chev
    Joined: Dec 28, 2007
    Posts: 26,486

    Mr48chev
    ALLIANCE MEMBER

    Well with no place to put oil in he won't have a problem with oil leaks. May have a real bad rod knock problem but no oil leaks.
    I had to go look to see what these "Turbofire" valve covers were
    Plain old 327 valve covers with a space for a turbofire decal in the middle
    [​IMG]
    There is a crap load if different decals depending on how accurate you need to be or how much you need to impress the mouth breathers at car shows. "Wow Bub, dis one has a 350 hp 327 in it"
    [​IMG]

    [​IMG] Plain 327 version.

    If you are bent on keeping the valve covers you will have to remove the intake and if the casting is set to cut the hole for the filler tube get the manifold cut to install a filler tube that will take a breather cap.
     
    Last edited: Jan 27, 2017
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  17. BigDogSS
    Joined: Jan 8, 2009
    Posts: 821

    BigDogSS
    Member
    from SoCal

    What is the brand/model of intake manifold? On some of them, there is a little flat place on the font of the manifold where a hole can be drilled for a oil tube. This is the route I would go.
     
  18. Jalopy Joker
    Joined: Sep 3, 2006
    Posts: 24,598

    Jalopy Joker
    Member

    could add aftermarket bolt on style breather to valve cover - see summitracing.com, etc - post pic of your current set up - where do you have PCV tube connected?
     
  19. Besides needing make up air as said already there's another issue. Providing that the engine is in tip top shape the vacuum from your PCV can create a negative pressure situation in the crank case. If left alone it can start to suck gasket's inward because the outside of the engine has more pressure on in than inside. Once the gasket slides you've got a leak which ever way you wanna look at. It'll now suck air or leaks oil out of the crankcase somewhere.
     
  20. Blue One
    Joined: Feb 6, 2010
    Posts: 10,331

    Blue One
    ALLIANCE MEMBER
    from Alberta

    :rolleyes: I like how this thread has gone on this long and the original poster has basically ignored the part about how he will add oil to an engine with no way to do so. :rolleyes:
     
  21. Your looking at it all wrong. Once he get's the air to go back in he'll notice that oil can enter also. [​IMG]
     
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  22. sunbeam
    Joined: Oct 22, 2010
    Posts: 4,695

    sunbeam
    Member

    My question how long does it take you to pour a quart of oil down the dip stick tube?
     
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  23. The root of this problem is the wrong intake.
     
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  24. i.rant
    Joined: Nov 23, 2009
    Posts: 2,751

    i.rant
    ALLIANCE MEMBER
    from Illinois
    1. 1940 Ford

  25. '52 F-3
    Joined: Sep 30, 2007
    Posts: 877

    '52 F-3
    Member

    when an engine is new the carb/intake vacuum is designed to suck crankcase fumes in and burn them. It should have an air intake into crankcase somehow, usually the filler tube breather or a elbow pipe from air cleaner to valve cover.

    if your dipstick tube isn't air tight, it will work for the air intake.

    at higher RPM and when an engine gets older cylinder compression blows by into crankcase and the PCV valve can't keep up. If your engine is tight because of no "breather" it will find a place to push the oil fumes and oil out.
    I've seen a dipstick get blown out before......

    not the easiest, but you could add oil thought dipstick :)

    nice fix would be drill the intake for on of these;
    [​IMG]
     
    Last edited: Jan 27, 2017
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  26. Blue One
    Joined: Feb 6, 2010
    Posts: 10,331

    Blue One
    ALLIANCE MEMBER
    from Alberta

    Speaking of dipsticks, I'm beginning to think that might describe someone. :D
    I shouldn't say who, but he has an engine that he can't put oil in :D
     
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  27. He didn't like the answers so he's gonna ignore it in the hope that a miracle will touch his engine.
     
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  28. kma4444
    Joined: Sep 24, 2008
    Posts: 197

    kma4444
    Member

    I think the plan is to let the pcv pull a good strong vacuum and then just pour the oil over the engine and let it get pulled in the crankcase.
     
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  29. Eiy yie yie!
     
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  30. harris73085
    Joined: Feb 4, 2009
    Posts: 151

    harris73085
    Member

    I just pull the pcv and fill from the back of the block. Doesn't take long at all.


    So from what I've seen here, the helpful people say yes, needs an inlet for fresh air or else I'll have other issue. So yes, I either need to drill the one I have (it has a flat casting spot where the oil filler neck should go) or but a new one that already has the oil filter neck hole drilled.


    Yes, by the turbo fire valve covers I should have just said sealed with no inlets for pcv or breather to avoid confusion.

    Sent from my Nexus 6P using The H.A.M.B. mobile app
     

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