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I have a CB Performance breather mounted on the alternator stand so it "breathes" up through the stand, just like the original VW and the same as the Berg breather.  Originally, I had 7/16" ID hoses, one to each air filter to vent the case, and a 3/8" drain hose going to the fuel pump block-off plate to drain back into the sump.  It worked OK, but I was still getting quite a bit of pressure, shown by oil being blown out around the crankshaft behind the fan belt pulley.  Bear in mind that the Sainted VW Designers engineered it that way to keep any dust/debris from getting sucked IN past the crank, so some positive crankcase pressure is desirable, just not too much.

Over time and by trial-and-error, I deleted the 3/8" drain hose as it wasn't needed (the system drains any oil right back down the oil filler pedestal), added a "Chore Boy" stainless steel scrubber pad inside of the breather box to trap airborne oil being vented, upped the air filter hose ID from 7/16" to 5/8" and that got me down to an acceptable amount of pressure - around town it get almost nothing leaking out behind the pulley.  If I'm beating on it on the freeways at 70 - 80-ish all afternoon then I get maybe 4 - 6 drops on the floor after I stop.  That amounts to about 1/4 to 1/2 quart per year.  I figured that's acceptable.  Your mileage may vary.

@R Thorpe posted:

No leaks , fingers crossed, my carbs run smoother with no crankcase feed.  

That’s what I figured. I lost my air filter input and run a 5/8” hose from my fuel pump block off and a 1/2” hose from my oil filler neck to a catch can filled with ChoreGirls vented to below the car with a 1/2” hose.

I get a few drips from my valve covers occasionally, but none from the pulley area. The catch can has a sight glass on it and after running it for two years, oil has never appeared in the sight glass.

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  • mceclip0

I hope there is not a problem with too much breathing.

I have two breather boxes.  I have a CB alternator stand mounted breather box with an added connection to the fuel pump block off and connections to the air cleaners

I also have an EMPI breather box mounted up high on the front of the firewall.  I have a vent line from my Berg-5 and my valve covers connected to it.

I wouldn't do that. Do you want 90w and engine vapors to mix?

Robert M, you motor looks SWEET!

Last edited by DannyP

Originally, the Berg-5 had a single vent in the nose.  Then, the builder said I should add a second one above the R&P.  So, I have two trans. lines connecting to the breather box.

Yes, Michael, although I can't see there being enough intermixing to be an issue, and with the drain going back to the engine you'd only have to worry about diluting the engine oil, what I'd worry more about is the constantly changing engine vacuum pulling oil out of the trans.   Is it possible- I don't know, but I think you're still better off to keep the 2 (engine and trans) systems separate.  Al

PS- how are you doing?  Are you getting out in your car much?  Did you get your shifting issue figured out?                                                                                                      And btw- the suggestion to add another breather line above the r&p originally came from GBE.

Last edited by ALB

Originally, the Berg-5 had a single vent in the nose.  Then, the builder said I should add a second one above the R&P.  So, I have two trans. lines connecting to the breather box.

IMO with the fifth gear the vent of is used to prevent frothing and the vent and catch can being high allows the tranny oil to go up if and when it is thrown up towards the catch can and as the tranny settles down the oil goes back down into the tranny. This would not happen with a vent right on the tranny and could end up leaking and you could end up running out of tranny gear oil and get a full STOP Tranny seize up.  FYI I have lived this.

In conclusion, you should seperate the two for sure as the mix would not be good in your tranny at all IMO

FWIW it would be nice to have a berg tranny apart to see if the fifth in the nose cone gets affected by oil starvations and if discolouration occurs on 5th showing oil starvation and overheating

Last edited by IaM-Ray
@Robert M posted:

I'm using an original 356 oil filter housing for my breather "box" with Fagioli fittings. The motor is a 2110 cc with about 150HP at 5600 rpm. Peak torque is 153 ft lbs from 4200-4600 rpm. Compression is 8.8-1.

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That’s ingenious, Robert, and looks the business. How does it vent?

@R Thorpe posted:

My setupE699731F-7422-40F8-AB90-61ADD59B3633

Same with yours R.  

Like I said, I ran a 1/2” hose from the top of my catch can down through the bodywork behind the firewall outside the spring plate. (But my Spyder is backasswards, obviously.)

@IaM-Ray posted:


...FWIW it would be nice to have a berg tranny apart to see if the fifth in the nose cone gets affected by oil starvations and if discolouration occurs on 5th showing oil starvation and overheating

Berg did send out a notice some time after the original run (they sold about 700(?) of the first design with the modified stock gear holder casting)- iIrc, some holes and grooves to get more oil to the shafts(?), so there was something going on.

@dlearl476 posted:

That’s ingenious, Robert, and looks the business. How does it vent?

Same with yours R.  

Like I said, I ran a 1/2” hose from the top of my catch can down through the bodywork behind the firewall outside the spring plate. (But my Spyder is backasswards, obviously.)

One of the hoses runs from the oil filler tube to the top of the oil filter canister and a second hose runs out the bottom of the canister back into the case. The lid was modified so there is a little bit of standoff to relieve the pressure or allow fresh air in, whatever it does. Lol

@Robert M posted:

One of the hoses runs from the oil filler tube to the top of the oil filter canister and a second hose runs out the bottom of the canister back into the case. The lid was modified so there is a little bit of standoff to relieve the pressure or allow fresh air in, whatever it does. Lol

You don't find it mists your engine compartment with oil?

That's why I ditched my air cleaner input. At the end of the summer, my driver's side carb throttles would be covered in oil.

Last edited by dlearl476

I wanted to get rid of hoses so I drilled two holes in the back of my breather box and installed two 1/4" X 4" pipe nipples. These go thru the firewall and the hoses from the valve covers connect back there. I made a little breather housing out of aluminum that has a small, replaceable paper filter in it and attached this to the fan stand. This really cleaned up the clutter in the engine compartment.  See photo...............Bruce

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@aircooled posted:

I wanted to get rid of hoses so I drilled two holes in the back of my breather box and installed two 1/4" X 4" pipe nipples. These go thru the firewall and the hoses from the valve covers connect back there. I made a little breather housing out of aluminum that has a small, replaceable paper filter in it and attached this to the fan stand. This really cleaned up the clutter in the engine compartment.  See photo...............Bruce

Very nice bruce. Your work is ALWAYS meticulous.

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