Crankcase venting advise
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Crankcase venting advise

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    Senior Member ICECREAMAN's Avatar
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    Default Crankcase venting advise

    I tried a few searches and either I suck at searches, which is totally plausible, or I didn't find the answer to my question.
    I have 505 BBC with a 671, 10qt Dooley pan running 8 qts in the pan, no vacuum pump or evac or VC breathers. My question, is 2 -8 lines coming off the valve covers to a puke tank sufficient for crankcase venting? I'm doing the engine plumbing in SS hardline and I'm build the puke tank myself so I want to get it right the first time. Thanks, ICM

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    Ain't Right Racin piston in the wind's Avatar
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    Quote Originally Posted by ICECREAMAN View Post
    I tried a few searches and either I suck at searches, which is totally plausible, or I didn't find the answer to my question.
    I have 505 BBC with a 671, 10qt Dooley pan running 8 qts in the pan, no vacuum pump or evac or VC breathers. My question, is 2 -8 lines coming off the valve covers to a puke tank sufficient for crankcase venting? I'm doing the engine plumbing in SS hardline and I'm build the puke tank myself so I want to get it right the first time. Thanks, ICM
    We run 2 -16's to a puke tank mounted high

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    gn7
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    the bigger the better. No such thing as too big. It won't matter a spit if the tank's breather isn't up to size. For a year I ran -16 off each VC and still had issues with pan and VC gaskets. Blew the front seal out of the t cover once, and had the motor self distruct because of it. That was the last straw.
    Now granted, it was a race motor turning sustained R's in the 7000 plus range for more than a little while. But, blower motors tend to make pressure when they are hammered. And the engine doesn't know if there is another boat next to you or not.
    Turned out it wasn't so much the line size as the breather size on the puke tank.

    I would say -10 minimum, -12 are better. But the breather has to be up to flowing as much as the lines, or you're spinning your wheels. The breather on this won't flow much more than 2 -8s. yet it has -16 inlets. go figure.




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    Last edited by gn7; 04-23-2012 at 08:23 PM.

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    Canoe Jockey Michael Thomas's Avatar
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    Bob who makes that tank in your post?
    "If you can't dazzle them with brilliance...Baffle them with bullshit"

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    gn7
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    There are a couple of companies make them. All pretty similar. Rex sells them. They are great for a N/A deal or even a recreational blown deal, probably even a drag boat. Most Ks run a similar deal but the breather seems bigger. I have seen this same tank with a 2nd breather added. When we went to a E vac to the headers, all the issues we had went bye bye. Don't know if we are actually pulling a vac or not. Probably are because when we first started running the E vac it would pull oil into the exhaust in the turns and I had to modify the VC burn downs. I just know we aren't creating any pressure.



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    Last edited by gn7; 04-23-2012 at 08:55 PM.

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    Senior Member ICECREAMAN's Avatar
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    Thanks for the replies. The info will help a lot. ICM

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    GN7..I take it since you're blown, you run zoomies. Do you have a nipple in one header tube on each side much like those used in the collecter headers?

    Tim
    Last edited by River Rat 005; 04-26-2012 at 06:58 PM.

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    gn7
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    Quote Originally Posted by River Rat 005 View Post
    GN7..I take it since you're blown, you run zoomies. Do you have a nipple in one header tube on each side much like those used in the collecter headers?

    Tim
    We have run both. We are very confused racers. Actually, we run the zoomies for the most part, because it sounds bitchin and they make working on the engine, and running the valves much easier. If I told you it was for any other reason, I'd be lying. The driver like the zoomies, not because of power, because it sounds bitchin. Of course he can't hear shit after the races, even with ear plugs, but they are his ears.
    Yes, when we run the zoomies we weld a fitting into the last pipe on each side. NO! It does not evac as well as a collector, but well enough to keep the gaskets in the motor and not puke everywhere.

    My favorite headers to run are the ones in my avatar, which are Rewarder PlaceCraft headers. But we burned up the last set se had and I need to replace most of bends near the heads. When I get them fixed, they will be back on.



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    Last edited by gn7; 04-26-2012 at 07:22 PM.

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    Bob thanks for the come back. I wasn't sure if the zoomie evac would work. Got the kit so I'll try it. The puke tank vent didn't work very well. Would you suggest that the tubes in the valve covers be at the high end in a drag boat.? Don't need to suck oil out.

    Tim

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    gn7
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    Quote Originally Posted by River Rat 005 View Post
    Bob thanks for the come back. I wasn't sure if the zoomie evac would work. Got the kit so I'll try it. The puke tank vent didn't work very well. Would you suggest that the tubes in the valve covers be at the high end in a drag boat.? Don't need to suck oil out.

    Tim
    I would always put the breather foward as reasonably possible on the valve cover if using burn down breathers, or from the front end of the cover if using something like a AN bulkhead fitting and a baffle something like this.



    We never had very good luck with just running the puke tank either.



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    Would the burn down breather be the ones I see on most evac systems? The rule book says to run evac I need an oil seperating breather. You think this is what they are talking about? ThanksTim

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    gn7
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    Quote Originally Posted by River Rat 005 View Post
    Would the burn down breather be the ones I see on most evac systems? The rule book says to run evac I need an oil seperating breather. You think this is what they are talking about? ThanksTim
    I wouldn't consider either a burn down like this which is baffled,


    or the piece I posted earlier a oil seperator. If your rules state that it has to be an oil seperator, even if its routed to the exhaust, you need something more like the stock oil filler caps with a hose line fitting like this. These are sold with the reed valves for the header pipe in a kit from Moroso.

    I take it this rule is a car drag rule. I have never seen a boat racing rule that requires a oil seperator to an exhaust extractor.

    If you don't run the pan E vac, then I would think routing lines from a set of baffled burndowns to a puke tank would meet their rules.



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    Last edited by gn7; 04-28-2012 at 07:37 PM.

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    Ya! the Moroso was what I was thinking of.

    The rule is for boat drags. It's in the Lucas rule book. States that it either has to have a catch can or if it goes to the headers it must have an oil separating device. Them enviro people are just trying to ruin all our racing fun.LOL

    I got a Moroso kit. Now that I know it should work better than the puke tank, I'll have to open the box and see how to install it.


    Thanks alot for the info.


    Tim

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    i have the moroso evac set up,works fine. However i suggest you replace the breathers(valves) ever couple of years ,as they burnout and can be a source of water(if on wet headers) into the engine. Been there ,cost me alot of $ before we figured it out.

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