Oxy crankcase ventilation

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grelland
Posts: 802
Joined: Fri May 13, 2005 4:47 am

Oxy crankcase ventilation

Post by grelland » Wed Feb 28, 2018 2:33 am

Guys,

Looking for some advice on crankcase ventilation.

For the last couple of seasons, I have run a very simple setup with a Berg breather box and a AN-10 hose to an adapter in the distributor hole in order to balance the left and right side case halves:
last year.jpg
I am planning a change in the air filter setup, so I will not be able to fit the Berg tower any more.

So to the question:

Is this left-right case half hose really necessary? Can I get away with using a simple oil filler like this:
filler.jpg
And then a breather box/catch tank on the firewall?

Are there any other considerations with an oxy case vs standard type1?
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bug66
Posts: 172
Joined: Tue Apr 01, 2014 3:26 am

Re: Oxy crankcase ventilation

Post by bug66 » Wed Feb 28, 2018 5:22 am

Put that filler tube in a lathe. Turn it down to 40mm, use 40mm hose to a custom breather box with a 40mm airfilter from Biltema..
---

2165cc T3/T4 turbo, DTA S60 on E85.

Boost was created only to make people smile, and make power! 8)

10.626 @ 132mph SCC2016
10.407 @ 134mph SCC2017
10.221 @ 135mph SCC2018

flat4olsen
Posts: 14
Joined: Wed Sep 25, 2013 5:00 am

Re: Oxy crankcase ventilation

Post by flat4olsen » Wed Feb 28, 2018 2:31 pm

My engine is pretty much identical to yours. I vent from the valve covers and from the oil filler (I run an OEM Mexican generator pedestal) to a breather box on the firewall. No problem with excessive pressure or oil leaks. I think you will be fine with the oil filler shown above.
Don´t throw your Berg breather away. Just send it to me, and let me throw it away for you :-)

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grelland
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Re: Oxy crankcase ventilation

Post by grelland » Wed Feb 28, 2018 4:40 pm

Hehe. Thanks guys. No need to overcomplicate then ;)

Just for curiosity, flat4Olsen. Is it necessary to vent the valve covers? I have not done that on any of my last builds.

flat4olsen
Posts: 14
Joined: Wed Sep 25, 2013 5:00 am

Re: Oxy crankcase ventilation

Post by flat4olsen » Thu Mar 01, 2018 8:54 am

I honestly don’t know. Some say yes and some say no. It can’t hurt, so I just did it to be safe.
Do you want my address so you can send the Berg Breather? 😂

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grelland
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Re: Oxy crankcase ventilation

Post by grelland » Thu Mar 01, 2018 11:24 am

😁

bug66
Posts: 172
Joined: Tue Apr 01, 2014 3:26 am

Re: Oxy crankcase ventilation

Post by bug66 » Thu Mar 01, 2018 12:41 pm

The logic of not breathing the valve covers are that the oil shall go down the 4 push rod tubes. Not the ventilation.

That little breather nipple is no way near enough. A stock 1600cc Type 1 engine has a lot more ventilation..
---

2165cc T3/T4 turbo, DTA S60 on E85.

Boost was created only to make people smile, and make power! 8)

10.626 @ 132mph SCC2016
10.407 @ 134mph SCC2017
10.221 @ 135mph SCC2018

bug66
Posts: 172
Joined: Tue Apr 01, 2014 3:26 am

Re: Oxy crankcase ventilation

Post by bug66 » Thu Mar 01, 2018 12:46 pm

And it does not matter if the breather box on the firewall is large, if the bottleneck is at the engine side..
---

2165cc T3/T4 turbo, DTA S60 on E85.

Boost was created only to make people smile, and make power! 8)

10.626 @ 132mph SCC2016
10.407 @ 134mph SCC2017
10.221 @ 135mph SCC2018

flat4olsen
Posts: 14
Joined: Wed Sep 25, 2013 5:00 am

Re: Oxy crankcase ventilation

Post by flat4olsen » Fri Mar 02, 2018 7:13 am

I am not going to argue about the logic of breathing the heads. As I said, I don’t know if it is needed. I know Porsche did it on the 914 with 2.0 l engine, and I think they did it for a reason. If it works for Porsche I have no reason to question the funktionallity.
Image

bug66
Posts: 172
Joined: Tue Apr 01, 2014 3:26 am

Re: Oxy crankcase ventilation

Post by bug66 » Fri Mar 02, 2018 7:18 am

Did Porsche vent both sides, or just one side?

One side fills up with oil, the other doesn't..
---

2165cc T3/T4 turbo, DTA S60 on E85.

Boost was created only to make people smile, and make power! 8)

10.626 @ 132mph SCC2016
10.407 @ 134mph SCC2017
10.221 @ 135mph SCC2018

flat4olsen
Posts: 14
Joined: Wed Sep 25, 2013 5:00 am

Re: Oxy crankcase ventilation

Post by flat4olsen » Fri Mar 02, 2018 9:40 am


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