PCV question/help
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PCV question/help

  1. #1
    Senior Member larryfknrocks's Avatar
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    Default PCV question/help

    i ran a 3/8 line from the neck of the pcv breather to the vacuum part (back of the carb). does this look right? i talked to someone yesterday after i sent a photo of it and he believed that this will probably lean the motor out. input and advice please. i'll probably leave the boat alone today and turn some wrenches tomorrow
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    gn7
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    You'll be lucky if it even idles. That only works if you have a PCV valve in the line somewhere. The cap is not a PVC, and I doubt there is one screwed into the carb base.

    One some boats that line from the breather goes to a fitting that attaches to the side of the flame arrester r the line attaches to an fitting on the top cover or the base of the flame arrester, and the carb will simply suck in blowby as it exits the hose.

    DO NOT run the boat with the setup you have now!



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    Or Seth, either one Budweiser's Avatar
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    Default Yup


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    Quote Originally Posted by larryfknrocks View Post
    i ran a 3/8 line from the neck of the pcv breather to the vacuum part (back of the carb). does this look right? i talked to someone yesterday after i sent a photo of it and he believed that this will probably lean the motor out. input and advice please. i'll probably leave the boat alone today and turn some wrenches tomorrow
    Click image for larger version. 

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    Is that one of the billet breathers that actually has a PCV valve built in?

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    Senior Member larryfknrocks's Avatar
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    Quote Originally Posted by gn7 View Post
    You'll be lucky if it even idles. That only works if you have a PCV valve in the line somewhere. The cap is not a PVC, and I doubt there is one screwed into the carb base.

    One some boats that line from the breather goes to a fitting that attaches to the side of the flame arrester r the line attaches to an fitting on the top cover or the base of the flame arrester, and the carb will simply suck in blowby as it exits the hose.

    DO NOT run the boat with the setup you have now!
    thanks gn for that. i took it off the carb IMMEDIATELY and place the rubber nipple back on the carb. i do have a fitting on my flame arrester. do you think thats a more suitable place for it? is it an option to have this valve or can i just use regular breathers?

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    Quote Originally Posted by obnoxious001 View Post
    Is that one of the billet breathers that actually has a PCV valve built in?
    yes it is

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    gn7
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    Quote Originally Posted by larryfknrocks View Post
    yes it is
    Larry, before you say that, you have to fully understand what he is asking. He asked, is that valve cover "breather" have a PCV valve built into it.


    I have NEVER seen one that wasn't machined aluminum billet, or that didn't have a AN hose fitting. That APPEARS to be neither.
    The picture APPEARS to be a chrome steel breather with a plain hose fitting.
    Can you see the PCV valve in the bottom of this? Does yours look like this when you flip it over?





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    Quote Originally Posted by gn7 View Post
    Larry, before you say that, you have to fully understand what he is asking. He asked, is that valve cover "breather" have a PCV valve built into it.


    I have NEVER seen one that wasn't machined aluminum billet, or that didn't have a AN hose fitting. That APPEARS to be neither.
    The picture APPEARS to be a chrome steel breather with a plain hose fitting.
    Can you see the PCV valve in the bottom of this? Does yours look like this when you flip it over?

    no it looks like this
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    gn7
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    Wow, thats a new one on me. Leave it to those Chinese.

    OK, now you have a different issue to deal with.

    The valve in that thing is a spring loaded check. It OPENS when the vacuum is high, and pulls "fumes" from the crankcase.
    BUT, it needs air to enter the crankcase or it can pull your pan into a vacuum. Thats not all bad really, BUT, when the vacuum goes away when you open the throttle, it will close, and your crankcase will be sealed. You have no breather on the other valve cover. PCV
    stands for POSTITIVE CRANKCASE VENTILATION, not crankcase vacuum.

    If you leave the setup the way it is, you will seal off the crankcase when you are driving, and blow the gaskets all to hell.

    There is a reason boats don't use PCVs. #1, they aren't required. #2, They don't really work. When you drive down the freeway in your car, yiour throttle is open so little that you still have manifold vacuum. In a boat, the throttle tends to be open too far too much of the time for it to work.

    Your MUCH better off with a setup like Budweiser posted. One hose off each valve cover. The engine will vent much better when the throttle is open.



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    Quote Originally Posted by gn7 View Post
    Wow, thats a new one on me. Leave it to those Chinese.

    OK, now you have a different issue to deal with.

    The valve in that thing is a spring loaded check. It OPENS when the vacuum is high, and pulls "fumes" from the crankcase.
    BUT, it needs air to enter the crankcase or it can pull your pan into a vacuum. Thats not all bad really, BUT, when the vacuum goes away when you open the throttle, it will close, and your crankcase will be sealed. You have no breather on the other valve cover. PCV
    stands for POSTITIVE CRANKCASE VENTILATION, not crankcase vacuum.

    If you leave the setup the way it is, you will seal off the crankcase when you are driving, and blow the gaskets all to hell.

    There is a reason boats don't use PCVs. #1, they aren't required. #2, They don't really work. When you drive down the freeway in your car, yiour throttle is open so little that you still have manifold vacuum. In a boat, the throttle tends to be open too far too much of the time for it to work.

    Your MUCH better off with a setup like Budweiser posted. One hose off each valve cover. The engine will vent much better when the throttle is open.
    LMFAO!!!

    i follow what you are saying after reading this a couple of times. in a nutshell, i really dont have to use a pcv since it is not required, to eliminate a headache i could go with a good set of breathers?!? or stick with this and just get it plumbed right?

  13. #11
    gn7
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    If its a open engine compartment, I would go with two good breathers. You can even use the K&N push in type. If its a closed engine compartment I would go with a deal like budweiser posted, or leave the one you have and add a hose off the other valve cover up to the flame arrester. Open breathers on a closed deal can make the engine compartment a oily mess after awhile.

    You can leave what you have on a open engine, but you have to add the second hose from the other valve cover.





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    Last edited by gn7; 05-31-2012 at 10:39 PM.

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    i might just buy two breathers and call it a day... thanks for the help!

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    Default PK, but.....

    Quote Originally Posted by larryfknrocks View Post
    i might just buy two breathers and call it a day... thanks for the help!
    Using two breathers MAY cause oil "misting" aft of those breathers. I use one breather, (not a lot of dust/dirt on the water so it's not necessary to filter the "IN" air of the system), and a PCV on the other valvecover. I have learned over the years it prevents the oil misting during hard runs...
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