slinging oil out of breather
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slinging oil out of breather

  1. #1
    Senior Member hotbo's Avatar
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    Default slinging oil out of breather

    okay fellas help us out here or give us some options
    my brothers motor in his tx is giving us fits and we are sick of it
    here is a run down.468bbc
    he pulled a top ring land off of a kb piston several months ago,#4 cylinder leaned way out.so he bought a set of trw forged pistons and howard racing rings.
    took the mill apart had his machine shop hone cylinders to fit the forged pistons and they polished the crank and vated the block new cam bearings ect.they installed the crank before he got it back from them.
    okay he file fitted the rings for nos usage and installed everything else.
    pistons are 10.1,heads are 049 castings with stock size valves but have ss undercut valves in them.intake is a weiand team G with a 750 holley on top.crane pushrods and crane roller rockers.lower end is stock.cam is a 306s by comp.
    it has a 15 quart basset oil pan on it with only 12 quarts in it.
    he had oil restrictors in it before it scattered and we are wondering if the machine shop put them back.
    heres the problem cruising speed everything is good.hold it wot 5500 it will push a ton of oil out of left valve cover breather.i mean alot not a mist more like you are pouring it out.oil pressure is 55 psi wot and the covers have baffles in them.

    it did not do this before the rebuild.what the f--k is going on it is really making us crazy.the motor has good compression,has used no oil up to date {except what it has blew out}.no smoke everything else checks out.
    please help with your info,thanks travis

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    Cantard 71hallett's Avatar
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    I think you need to do a leak down test Just to be sure. Any chance the head guasket is covering up the holes at the end of the head or screen in the lifter valley not letting oil back down? If its running out that bad and isnt killing moskitoes I would say it isnt going back down.
    Quote Originally Posted by gn7 View Post
    It would be a balmy 85* in Steel's shop if he would move a little faster

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    Senior Member hotbo's Avatar
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    Quote Originally Posted by 71hallett View Post
    I think you need to do a leak down test Just to be sure. Any chance the head guasket is covering up the holes at the end of the head or screen in the lifter valley not letting oil back down? If its running out that bad and isnt killing moskitoes I would say it isnt going back down.
    same head gasket as before 1037 felpro.no screen in the lifter vallley
    tried to do a leakdown test but my damn guage was screwing up.the 2 cylinders that i did get it to work on it was 10-12 percent.

    it does not smoke motor sounds freaking great just under wot it does this and only on the left bankweird as hell.imo i wonder if the shop put 1 restictor back in and left other out,but still i cant see it pushing that much to the top.

    okay im going to add some other info here.wondering if this might have some affect wouldnt think so but im gonna tell anyway
    compression on #4-#6 are down from the rest.all of them checked 165-170 these 2 cylinders checked lower 112 on #4 and 125 on #6 wierd as hell and the #4 that leaned out before is doing the same thing again.we are starting to scratch our heads here me and brian are both not dumbasses at all and this is puzzling the hell out of us.

    the valve cover that is losing all the oil has one hell of a baffle with a k-n style breater that is oil soakedthe other side right bank has no baffle in the valve cover and pcv valve going to the carb and it does just great.why just 1 side

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    Cantard 71hallett's Avatar
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    112 and 125 means you better take it apart. Is it possible it is running lean and those are the cylinders that show it first? Maybe an other issue causing it. Those 50-60lbs of compresion have to go somewere.
    Quote Originally Posted by gn7 View Post
    It would be a balmy 85* in Steel's shop if he would move a little faster

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    Senior Member hotbo's Avatar
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    all plugs look right on the money as far as plug reading,except #4 that let go before,the mill has maybe 5 hours total run time and the plug looks like you took it out of the box.but imo that is not goona cause oil to blow out of the vavle breather like that.we are trying to take it one step at a time.so far it sucks,lol!!!!!

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    I'm baaaaack... hkunz's Avatar
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    Did you use conventional rings, or zero gap second rings? I had massive blowby with hot oil shooting on the kids, then i put in the ZGS rings, and it stopped.

    Second problem - excess oil in the top end. Are your pushrods restricted? Did you make sure the oil returns out of the heads is good, i.e. no gasket corners sticking out, did put the magnets directly in the path, etc.?
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    Default Compression loss

    First use the old school way to see if the compression loss is rings or valves. Squirt a little Marvel or plain old 30wt in the low cylinders and re test the compression on those 2 cylinders. IF the compression comes up it would indicate the compression is slipping past the rings. This CAN create way too much crankcase pressure and push the oil out the breather at a faster rate than the PCV valve can evac the pan.........If the compression does not come up it would be bad valve sealing when closed. I don't know what type breathers you're running but I would try sealing the breather on the PCV side and make the motor "suck in" on the other side. Be careful here because you could push the front and rear seals, as well as the intake end seals, out of it. IMO, you may have broken rings in those two holes, or a pushed out head gasket on the valley side of the head. The gasket would cause a lot of crankcase pressure, too much for most pan evac systems, and way more than a PCV valve can overcome.......Happy hunting......Oh, and good luck.............Ray
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    TEN THIRTY ONE RCB19's Avatar
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    If you file fit the rings for nos the gaps are much wider than normal. Crank case pressures will be higher because of this and you need to relieve it with a pan-e-vac system or a vacuum pump. Not saying this is why you are having this problem but can be a large contributor. #'s 4&6 need to be looked at and yes a leakdown test is the best way to go. Not a big fan of a compression tester to diagnose problems. They just let you know that you "might" have one.
    RCB

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    mo balls than $cents$ IMPATIENT 1's Avatar
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    Quote Originally Posted by RCB19 View Post
    If you file fit the rings for nos the gaps are much wider than normal. Crank case pressures will be higher because of this and you need to relieve it with a pan-e-vac system or a vacuum pump. Not saying this is why you are having this problem but can be a large contributor. #'s 4&6 need to be looked at and yes a leakdown test is the best way to go. Not a big fan of a compression tester to diagnose problems. They just let you know that you "might" have one.
    same thing here trav, i run big gapped rings for nitrous and you know what i had to do to control that its time to put a puke tank on bri's boat, i know he just got the headers coated so evacs are outta the question i bet.
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    Senior Member hotbo's Avatar
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    Quote Originally Posted by IMPATIENT 1 View Post
    same thing here trav, i run big gapped rings for nitrous and you know what i had to do to control that its time to put a puke tank on bri's boat, i know he just got the headers coated so evacs are outta the question i bet.
    thats what we are thinking about doing tombut it still shouldnt push that much oil out,i mean its like the exxon valdez when wot,other than that all is good.

    yeah we are gonna address the compression situation but for know we both have had our share of problems and want to run our boats.it is just makes him mad he has had problem after problem.

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    mo balls than $cents$ IMPATIENT 1's Avatar
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    Quote Originally Posted by hotbo View Post
    thats what we are thinking about doing tombut it still shouldnt push that much oil out,i mean its like the exxon valdez when wot,other than that all is good.

    yeah we are gonna address the compression situation but for know we both have had our share of problems and want to run our boats.it is just makes him mad he has had problem after problem.
    have him check out those puke tanks that hang off the back of the breathers trav, they sure work good and are easy to mount. my tank gets in the way everytime i gotta do something to the pump

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    Spiral out MikeF's Avatar
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    You've got wayyyyyyy to much oil in it......3 gallons. That crank is slinging that stuff everywhere. I would start there cause it is the easiest to change.

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    I'm No Expert Shaun's Avatar
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    Does the valve cover have baffels in them? I had issues with oil comming out my breathers at WOT and it was because i put my breather right over a rocker. At WOT it was shooting oil up into the breather and would go everywhere. My solution was these delio's i got from rex that have three levels to them, i was going to run a puke tank but ended up just hookin the breathers to the end of it and it has solved my problem.

    here's a pic of them

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