Do you need breathers on your puke tank?

Discussion in 'PSI Superchargers Tech Questions' started by Bad1969nova, Jan 24, 2014.

  1. Bad1969nova

    Bad1969nova Member

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    I have always had the k&n style ones on my catch can but I have noticed aloft of promods an funnycars do not have any? Is it needed? I always seem to have a rag around mine any way to stop making a mess. This is for a screw blown brad thanks for any info 1/8 mile passes
     
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  2. youngtuner

    youngtuner Member

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    If the tank is designed right you don't need breathers many of th older tanks do need them cause of the way in the inside baffling is designed.
     
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  3. Mike Canter

    Mike Canter Top Dragster
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    I don't agree. The puke tank needs to breathe. The idea of the tank is if anything happens that results in large amounts of blowby caused by the boost pressure it can puke that pressure out of the motor into the tank instead of oil on the track. The tank has to catch the oil and at the same time release the internal pressure of the crankcase. If the pile tank is not vented then oh cannot accomplish that.
     
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  4. tcarr

    tcarr Member

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    mike i think you may have read that wrong, or mabye i am but what i think the op is asking is if you need a filter on the punk tank, a k&n style filter to go on the puke tank vent. I dont think there are any rules saying you must have a filter but if you have the room for it i dont see why a guy wouldnt run one just because
     
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  5. Mike Canter

    Mike Canter Top Dragster
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    Yes maybe I did, thanks
     
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  6. overkill69

    overkill69 Member

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    Puke

    If the tank had breathers on it chances are its not built properly...the system has to move a lot of air. We have measured crankcase pressure before and it's substantial with a properly built system in the rear of the car.we have a 2.5 gallon box vented through the deck lid like Frankie Taylor. It has a 2 inch outlet tube. When it's cool and humid at night you can see air blasting 5 ft out of it while on the 2step.
    We drain the tank every lap and mostly get water and alky. Never a drop of oil on the body or wing.
     
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  7. Blownalky

    Blownalky Top Sportsman

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    I have two puke tanks but I only use one at a time. Long story as I'm testing things. One is a custom carbon fiber in the front that is like two saddle tanks and it breaths out the bottom and I've had no issue with that but need to drain it often. It has no breather filters. I also have a tank for the rear that I ran breather filters on but I still ended up wrapping the filters to try to contain the water/oil mist that comes out. I don't think the filters really do anything though.

    Do all of you folks that have no oil in the puke tank run dry sumps? I run a wet sump and I get a lot of oil in the tank even on a new or fresh engine. Because of that and ground clearance issues, I'm really leaning to a dry sump for this year. I've been holding off because of added weight concerns but I think the loss of oil into the puke system is worse than the added weight. I'm so paranoid about all this blow-by stuff that I'm thinking of running a six stage pump with enough vacuum to suck the oil pan flat, LOL.
     
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  8. overkill69

    overkill69 Member

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    Probably not what you want to hear, but our chevy blew oil everywhere and the hemi doesn't .The chevy was noticably worse with a screw at high boost. I built baffles inside the valve covers and carefully restricted oil to the top. It was a 13qt wetsump.
    The hemi has open holes out of the covers and a 12qt wetsump with poor oil control but it seems to work.
    I run the same style rings and leakdown numbers on everything.

    The hemi actually has a worse path for air to get from the crankcase to the valvecover area. Without trimmed headgaskets the only flow goes through pushrod cutouts and oil return holes in the block. It might act like a oil seperator by accident.
     
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  9. Bad1969nova

    Bad1969nova Member

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    Tanks

    The main reason I'm asking this is I have an outlaw 10.5 car with a bae an a screw. I have to keep the stock front frame rails in so I was thinking of making them into a catch can the should hold atleast 3 gallions each. So I'm thinking weld a breather on the top front an a drain on the bottom backs.
     
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  10. tcarr

    tcarr Member

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    im not sure using the rails will work as it should for a tank. most tanks have baffels inside them to stop , slow down, and restrict oil flow so the tank holds the extra oil and keeps it off the track.Having just a filter off of the rail will probably just leak oil under acceleration of deceleration depending on where it is mounted. If your motor doesnt blow by very much then you might be able to get away with it but if you melted something all the oil and garbage would go from the motor to the frame rails, to the track and possibly the tires.
    Using the rails would be clean and simple but for a saftey stand point i would personally build or use a proper puke tank
     
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