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Breather box help
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Rockbound
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PostPosted: Wed Sep 08, 2021 3:55 pm    Post subject: Breather box help Reply with quote

So I’m having a blow by issue on my new motor while I’m breaking it in. 2276 big bore, big stroke, big cam, big valves and heads. Chromoly rings. It Was fine with break in oil no issues, was fine for about 500 miles after regular oil put in. Now I’m having massive blow by from the oil fill stand. Pumping oil into the carb. 1st I thought it was sucking the oil so I moved the breather up behind the motor and put a filter on it. Well I came to find out that the breather was pumping oil not being sucked. Because next time I drove it, it was spewing out of the filter all over the fan shroud and isn’t o the fan and all over the motor. Good times. So I bought a breather box and i have a question about it. This box does not seal. It has a lid that sits on tabs that keeps the lid about an 3/16 up from box. Is this normal or should that box be sealed?

I Plan on tapping into fuel pump block off to box, oil fill vent to box, both valve covers to box. Should I also go from box to air filter on carb?

Also upon checking compression I found 170 170 140 and 70. Obviously my blow by is coming from the low compression cylinders. I was told by the builder that that type of compression numbers are normal while breaking in and could take anywhere up to 2000 miles to break those rings in and the compression will eventually even out. Is this true?

Thanks for any input.
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evanfrucht
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PostPosted: Wed Sep 08, 2021 4:34 pm    Post subject: Re: Breather box help Reply with quote

170-140psi on three cylinders and 70psi on another is NOT normal during break in. BY ANY MEANS. Who ever told you that is an idiot.

Probably due to a broken ring or valve issue or something else. I would tear it down, maybe do a leak down test before.
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earthquake
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PostPosted: Wed Sep 08, 2021 5:09 pm    Post subject: Re: Breather box help Reply with quote

Also check the louvered plate under the Gen/Alt stand, if its backwards it might being throwing oil up the stand.

eQ
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Dale M.
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PostPosted: Wed Sep 08, 2021 6:23 pm    Post subject: Re: Breather box help Reply with quote

Rockbound wrote:
So I’m having a blow by issue on my new motor while I’m breaking it in. 2276 big bore, big stroke, big cam, big valves and heads. Chromoly rings. It Was fine with break in oil no issues, was fine for about 500 miles after regular oil put in. Now I’m having massive blow by from the oil fill stand. Pumping oil into the carb. 1st I thought it was sucking the oil so I moved the breather up behind the motor and put a filter on it. Well I came to find out that the breather was pumping oil not being sucked. Because next time I drove it, it was spewing out of the filter all over the fan shroud and isn’t o the fan and all over the motor. Good times. So I bought a breather box and i have a question about it. This box does not seal. It has a lid that sits on tabs that keeps the lid about an 3/16 up from box. Is this normal or should that box be sealed?

I Plan on tapping into fuel pump block off to box, oil fill vent to box, both valve covers to box. Should I also go from box to air filter on carb?

Also upon checking compression I found 170 170 140 and 70. Obviously my blow by is coming from the low compression cylinders. I was told by the builder that that type of compression numbers are normal while breaking in and could take anywhere up to 2000 miles to break those rings in and the compression will eventually even out. Is this true?

Thanks for any input.


Think you need a different builder....
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Matt Wilson
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PostPosted: Wed Sep 08, 2021 6:23 pm    Post subject: Re: Breather box help Reply with quote

To answer your breather box question, no, the box doesn't have to be sealed, it is allowing the engine to breathe in and out while using some sort of foam media to filter and keep dirt from coming in or too much oil puking out.

Some folks prefer a catch can method to not allow contaminated oil to drain back into the engine - you just have to be sure to drain the can when it's getting full. I always figured if the oil is drained to the sump and is then pumped to a filter before anything else, the drain-back method was okay for me.
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PostPosted: Wed Sep 08, 2021 6:27 pm    Post subject: Re: Breather box help Reply with quote

evanfrucht wrote:
Who ever told you that is an idiot.

^^^^^^^
THIS
Dale M. wrote:
Think you need a different builder....

^^^^^^^
AND THIS
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Rockbound
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PostPosted: Wed Sep 08, 2021 7:07 pm    Post subject: Re: Breather box help Reply with quote

earthquake wrote:
Also check the louvered plate under the Gen/Alt stand, if its backwards it might being throwing oil up the stand.

eQ


Yep it’s correct I checked
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evanfrucht
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PostPosted: Wed Sep 08, 2021 7:15 pm    Post subject: Re: Breather box help Reply with quote

Glenn summed up the situation pretty well.

But seriously... You got major issues. It's not a baffle or anything like that. Tearing into that sucker IS A MUST. Put a new top end on her Cool maybe new heads depending how bad the damage is.
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PostPosted: Wed Sep 08, 2021 7:21 pm    Post subject: Re: Breather box help Reply with quote

evanfrucht wrote:
Glenn summed up the situation pretty well.

But seriously... You got major issues. It's not a baffle or anything like that. Tearing into that sucker IS A MUST. Put a new top end on her Cool maybe new heads depending how bad the damage is.

I'd pull the head and the cylinder. Find the cause before it gets expensive.

Could be a tight valve or maybe the rings gaps lined up.
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evanfrucht
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PostPosted: Wed Sep 08, 2021 7:57 pm    Post subject: Re: Breather box help Reply with quote

True. Start with the heads. Don't take a sledge hammer to the cylinders just yet!

It could be just a valve train problem. Ring alignment is probably not the issue if you said it had a 500 good smoke free miles, that pretty much stays where it's set from the beginning. If it started smoking suddenly or puking oil one day to the next then that's not good. If it was more gradual then that is better but still not a great sign. Either way it may not be too bad in the end.

Take off the valve covers and look at the valves moving while it gets turned over. Watch each one, you may find the issue. That being said 100psi loss/deviation is pretty bad, just keep that in mind.
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jsturtlebuggy
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PostPosted: Wed Sep 08, 2021 8:41 pm    Post subject: Re: Breather box help Reply with quote

With that kind of compression reading and pumping that much oil, I am thinking wrist pin is wearing into side of cylinder from missing keeper.
Seen it before.
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slalombuggy
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PostPosted: Wed Sep 08, 2021 8:55 pm    Post subject: Re: Breather box help Reply with quote

Compression tests should never vary by more than 10% across the cylinders. Do a leakdown test but my guess is leaking rings. You do not want to see anything over 3% loss and you'll be able to hear where it's coming from.

You're just trying to put a bandaid on a gushing artery by installing a breather box. Find a builder who knows something about engines

Hopefully it looks better than this treasure I found on a freshly built engien that wasn't re-tuned for the added bump in hp

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Rockbound
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PostPosted: Thu Sep 09, 2021 4:56 am    Post subject: Re: Breather box help Reply with quote

Thanks for the input guys. Was exactly what my thoughts are
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Ohio Tom
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PostPosted: Thu Sep 09, 2021 12:13 pm    Post subject: Re: Breather box help Reply with quote

Very likely scuffed up a piston and cylinder.

My guess:

Either piston size was too big, or the ring gaps were not enough.
Seen it several times with Forged pistons. You must run more clearance with a forged piston.
And bigger ring gaps when boosted.
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Rockbound
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PostPosted: Sun Sep 12, 2021 6:53 pm    Post subject: Re: Breather box help Reply with quote

Well I tore into the motor tonight. And found this in cylinder 4
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PostPosted: Sun Sep 12, 2021 7:09 pm    Post subject: Re: Breather box help Reply with quote

That explains it.
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jsturtlebuggy
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PostPosted: Sun Sep 12, 2021 7:57 pm    Post subject: Re: Breather box help Reply with quote

Ohio made a correct answer.
Was there heat defectors under the cylinders?
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PostPosted: Sun Sep 12, 2021 8:05 pm    Post subject: Re: Breather box help Reply with quote

Looking at the latest Hot VWs October issue, Rockbound your buggy and you are in it on the “Dubs at the Lake” event on page 85.
Looks good.
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Rockbound
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PostPosted: Mon Sep 13, 2021 6:35 am    Post subject: Re: Breather box help Reply with quote

jsturtlebuggy wrote:
Ohio made a correct answer.
Was there heat defectors under the cylinders?


yes
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Rockbound
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PostPosted: Mon Sep 13, 2021 6:35 am    Post subject: Re: Breather box help Reply with quote

jsturtlebuggy wrote:
Looking at the latest Hot VWs October issue, Rockbound your buggy and you are in it on the “Dubs at the Lake” event on page 85.
Looks good.


o nice! thanks for the heads up appreciate that. ill have to grab an issue up
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