CB Performance breather box

[aeromech]

I just bought and installed this CB Performance breather box onto a 2007cc type 1 engine I'm building for a 1968 bus. Here's the question. After getting the lines run to the valve covers and installing the box I noticed that when a person goes to fill the engine with oil now through the new cap on the box the oil will most likely flow right down the breather hose and into the valve covers before going into the engine case. I assume that when the engine gets started then the oil in the lines will be pushed back to the breather box and eventually make it's way to the sump. Should I be concerned or just forget it and hope for the best?

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[Type 5 Joe]

That is one of those CB Performance products that I would not touch.
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[aeromech]

[Type 5 Joe]

There is a reason it costs $200.00+

There is also a reason Glenn has one on his red bug....
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[spyvsspy]

I used the top holes on that same breather box to run lines to the valve covers. I just plugged the bottom two to avoid that same problem. I guess that they are good for a return line to the sump or something.
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It is what it is.

[Glenn]

I personally like the Berg, but for the CB I would use the valve covers to the top and plug the bottom as already told.
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Glenn
74 Beetle Specs | 74 Beetle Restoration | 2180cc Engine
"You may not get what you pay for, but you always pay for what you get"

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#BlueSquare

[aeromech]

So I have to ask this.... let say I leave things plumbed like they are. When I add oil some of it will flow down the breather lines towards the valve covers and then the rest will go into the sump. When I start the breather pressure will blow any oil in the lines back to the box if it hasn't already entered the sump through the push rod tubes. So, as long as everything is tight and doesn't leak wouldn't that work out ok, or am I wrong here?
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Lead Mechanic: San Diego Air and Space Museum
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Licensed Pilot (Single engine Land)
Boeing 727,737-200-300-400,757,767
Airbus A319,320,321
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Fokker F28/F100
VW type 1 1962,63,65,69,72
VW Type 2 1971 (3 ea.) 1978, 1969
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[Type 5 Joe]

To put it simple....

It is a crummy design, and a chinese manufactured part.

If you leave it plumbed the way it is.... You are right the oil will run into the valve covers.

If you run the lines to the top it seems to be a better application, but it just defeated the purpose of the oil / air separation baffles in the unit.

Hmmm. Just run it, and throw it in the garbage can when you are done screwing around.
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[Glenn]

Well... the Berg has the valve cover vents at the top and the baffles below.

I just don't like the large seam that can leak and the fill where it is.
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"You may not get what you pay for, but you always pay for what you get"

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#BlueSquare

[Eaallred]

The CB box is just fine.

The breather lines on the bottom of the box make NO difference AT ALL.

When you add oil, the oil that goes down the breather lines will go into the valve cover, drain down the pushrod tubes, and into the case.

The only thing that can make it not work well, is if you route the lines with excessive length and end up with 'low spots' in the lines that will collect oil like a P-trap from a plumbing system.

The lines entering at the bottom is the better design as it does offer more oil/air seperation before it hits the vent to the atmosphere.
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Eric Allred

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[Type 5 Joe]

Glenn,

I just looked at my Berg instructions, and they want you to hook up the top fittings to vacume at the air cleaners

I'm sure there is no way Gene would have recomended that you vent the valve covers to an un-baffled breather.

I know you run a road draft tube to atmosphere.

I would plumb the valve cover lines below the baffles, but not to the very bottom of the breather.
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[Glenn]

My box has 3 fittings all at the top. Two come in on the top side and one on the very top next to the fill.

Sorry... I ground a picture and the valve cover fittings are about half way up.

I stand corrected.
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Glenn
74 Beetle Specs | 74 Beetle Restoration | 2180cc Engine
"You may not get what you pay for, but you always pay for what you get"

Member #1009

#BlueSquare

[Type 5 Joe]

That is a quality breather... And designed correctly.

Nice engine Glen.
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If you would like to contact me, just email through one of my ads on here...

I don't use the P.M. service on here.

[Glenn]

[Glenn]

My friend Raj has the CB box on a DRD built 2276 and he ran hardlines to the bottom ports. He's not had any blowby or related problems.

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Glenn
74 Beetle Specs | 74 Beetle Restoration | 2180cc Engine
"You may not get what you pay for, but you always pay for what you get"

Member #1009

#BlueSquare

[Chris Vellat]

The (newer?) Berg breather I have just has two inlets for valve covers and instead of a nipple to a air cleaner relies upon a filter/vented cap.

The problem with the CB setup is that it's like the early Berg unit and you need to run it to a filter, or all you've done is increase the displacement of your crankcase in an awkard manner and not vent it to atmosphere...I drilled a hole and added a K&N V8 valve cover breather to mine.

[aeromech]

Glenn,
Your buddy ran hard aluminum lines but I don't see any difference in functionality over the soft rubber lines I ran. They both go to the same place. Would you agree at this point that I should just give it a go and see what happens?
_________________
Lead Mechanic: San Diego Air and Space Museum
Licensed Airframe and Powerplant Mechanic
Licensed Pilot (Single engine Land)
Boeing 727,737-200-300-400,757,767
Airbus A319,320,321
DC9/MD80
BAe146
Fokker F28/F100
VW type 1 1962,63,65,69,72
VW Type 2 1971 (3 ea.) 1978, 1969
VW Jetta
VW Passat
Capable of leaping tall buildings in a single bound

[Glenn]

[QRP]

[aeromech]

Ok, I appreciate the honesty. I'll get back with the results. Also, about my other thread on the dells....
_________________
Lead Mechanic: San Diego Air and Space Museum
Licensed Airframe and Powerplant Mechanic
Licensed Pilot (Single engine Land)
Boeing 727,737-200-300-400,757,767
Airbus A319,320,321
DC9/MD80
BAe146
Fokker F28/F100
VW type 1 1962,63,65,69,72
VW Type 2 1971 (3 ea.) 1978, 1969
VW Jetta
VW Passat
Capable of leaping tall buildings in a single bound