Explain the 'Breather Box'

[Schepp]

I have a newly built 1600. I started having issues once I crossed the (+) 4500rpm range.
I'm in the process of making my own box with -10an lines. Bigger hoses are better. The filter area of the box also needs to be equally as big or bigger than the hoses combined. Or that volume of air wont be able to escape quick enough.

You cant have a 1" diameter hose and a 1/2" diameter filter. Its like filling your lungs and trying to exhale through a straw.

If the air doesn't have an easy escape path, it'll make its own. Like out the pulley crank snout.

I'm using an older factory oil filler with drain tube. I'm cutting off the small upper outlet and welding on a -10an fitting. Along with vented valve covers.

[onehappykombi]

[bluebus86]

the larger diameter the hoses, the better for a breather, 3/4 inch is not too large. there shouold be no low spots in the hoses that will fill with oil liquid and be a like a plumbing trap, air flow will then be restricted.

the idea is to flow the air and vapour well, but all the vapour to condense back to oil liquid and drain back into the motor. a catch can does not allow return of liquid and muct be peridoically dumped.

it is still wise to retian the road draft tube even with a breather set up.

use three hoses, one from each valve cover (mounted high up on cover) and one from the oil filler area. mount breather box high enough so it is all a down hill flow back to the motor

[jay64]

I'm going to put a breather box on it because I'm going to be building a 2110 for it anyway.
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'76 BUG 2054cc

[fluxcap]

Thanks for the pics and info RB, and Jay, that is what I'm afraid of. I do a good bit of interstate driving, usually keeping it around 65-68mph. I guess I can try the filter first, but if I get oil spewing out of it, I'll have to go to a box. Just trying to keep it simple in the engine compartment and didn't really want to mess with routing hoses and putting fittings in the valve covers if I didn't have to.
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Eric - 1966 camper bus

"It's like, how much more black could this be, and the answer is none.......none more black."

[jay64]

"Breather boxes are not necessary until you go above a 1776cc engine or start turning over 5000 RPM."

I have a 1600 in my 76 and it"s ring are not worn but if I get it going on the highway at 65 plus mph it will blow oil everywhere, around town no problems.
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'76 BUG 2054cc

[RailBoy]

FluxCap, here is a view of a Remote Breather Box mounted on my Rail's Engine. It is not the best photo but you can see it is mounted high on the shroud with a return hose back to the engine breather at the Oil Cap. This allows oil to drain back into the engine via gravity. Also, there are two hoses that go to the top of the valve covers that oil and air can travel up, at the same time, gravity again can allow oil to drain back into the valve covers at lower RPMs......

*Note, the black hose from the breather box on the passenger side going down the side of the engine is going to the valve cover that is not in view....
Also, the breather box acts as a small catch can were as access oil drains back into the case as explained, in most of the style breather boxes are air filters so air can pass through the top of them not allowing impurities into the oil system, nor case.....

RB

[fluxcap]

Great! I'll pick one of these up for it then. Thanks!
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Eric - 1966 camper bus

"It's like, how much more black could this be, and the answer is none.......none more black."

[vwracerdave]

All you should need is a cheep $8 mini air filter with a 1/2" connecton and put it on your stock oil filler vent. http://www.cbperformance.com/catalog.asp?ProductID=245
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2017 Street Comp Champion - Thunder Valley Raceway Park - Noble, OK
2010 Sportsman ET Champion - Mid-America Dragway - Arkansas City, KS
1997 Sportsman ET Champion - Thunder Valley Raceway Park - Noble ,OK

[fluxcap]

[68Bug-lite]

[billy1ear]

Looked at bergs oil filler breather box and saw it was $200+, lots of dough.
Saw cb performance had ripped off their idea in cast alum for $30+ . Was wondering if anyone has tried it?

http://www.cbperformance.com/catalog.asp?ProductID=241


Also was thinking about how to route the hoses from the valve covers. Where do you put the hose bibs in the valve covers (towards front, back, middle) and which way to route the hoses?

[beans66]

Do you have to run the breather box or an I just use some small valve cover filter I have off of say a v8 valve cover?
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"Could be worse, Could be addicted to dick."


"I just found out my car is a "HE" How many gurls you know like to be stroked and blown?"

[Glenn]

Both valve covers and to a filter.

Not to the carbs.
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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

עַם יִשְׂרָאֵל חַי

[billy1ear]

[grimace007]

[Bugman Jeff]

If you have old worn out rings, and you run 15 PSI of boost, and your breather system is inadiquate, there is enough pressure in the crankcase to blow the valve covers off the heads and dump all your oil all over the ground. Go ahead, ask me how I know...
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Restorer of Porsche Speedster 80486

[Glenn]

Not all breathers return the oil to the engine. Many are just a puke can and it sits there.

I have a Berg breather and it mounts to the oil fill.

_________________
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

עַם יִשְׂרָאֵל חַי

[FireBug1966]

Thanks for the info.

And...the box helps catch any oil that's purged...and that oil is simply returned by gravity (?). So you need to mount the box above the point where you vent the engine (?).

[volksfiend]