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oil breather washer hole size?
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thelongboardguy
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Joined: July 28, 2010
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PostPosted: Sat Nov 12, 2022 4:45 pm    Post subject: oil breather washer hole size? Reply with quote

1973 SB
dual carbs
1600
stock vented heads but the vents are capped off
single cap oil breather
all of the emissions parts have been removed

Greetings,

Image may have been reduced in size. Click image to view fullscreen.

I have recently removed the stock 2 cap oil breather and replaced it with a single cap breather as per recommendations by fellow Samba members. I have 2 different size washers for the inside. 1 has a 7mm hole in the center and the other is a 12mm hole. They both got mixed up in the cleaning bucket toss.
I do not know which would be the correct one to use for the single cap breather, nor do I understand how breathers work or why it would make a difference in hole size.
Both washers have the same outside diameters.

Any guidance on this is appreciated.

longboardguy
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Dual Empi Carbs

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pedro sainz
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Joined: July 26, 2005
Posts: 1429

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PostPosted: Sat Nov 12, 2022 7:37 pm    Post subject: Re: oil breather washer hole size? Reply with quote

thelongboardguy wrote:
1973 SB
dual carbs
1600
stock vented heads but the vents are capped off
single cap oil breather
all of the emissions parts have been removed

Greetings,

Image may have been reduced in size. Click image to view fullscreen.

I have recently removed the stock 2 cap oil breather and replaced it with a single cap breather as per recommendations by fellow Samba members. I have 2 different size washers for the inside. 1 has a 7mm hole in the center and the other is a 12mm hole. They both got mixed up in the cleaning bucket toss.
I do not know which would be the correct one to use for the single cap breather, nor do I understand how breathers work or why it would make a difference in hole size.
Both washers have the same outside diameters.

Any guidance on this is appreciated.

longboardguy


Regardless
Correct or Not

I would used the Bigger Center Hole
Will help Breathe Better
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Bobnotch
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Joined: July 06, 2003
Posts: 22358
Location: Kimball, Mi
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PostPosted: Sun Nov 13, 2022 2:48 pm    Post subject: Re: oil breather washer hole size? Reply with quote

Agreed. Keep in mind that you want to pull vacuum thru it, and the larger hole will make that easier.
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thelongboardguy
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Joined: July 28, 2010
Posts: 21

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PostPosted: Mon Nov 14, 2022 3:55 pm    Post subject: Re: oil breather washer hole size? Reply with quote

That makes sense.
I now have the 12mm washer installed.

Thanks
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1973 Squareback
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May he never be allowed to own or touch another motor vehicle as long as he lives.
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KTPhil Premium Member
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Joined: April 06, 2006
Posts: 33883
Location: Conejo Valley, CA
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PostPosted: Mon Nov 14, 2022 4:49 pm    Post subject: Re: oil breather washer hole size? Reply with quote

There is an open cell foam filter that fits into the spring, too.
https://vwispwest.com/filter-311115529a/
It tends to make an old soft/worn cap pop off, so it's often left out.
FWIW, the ISPwest washer drawing shows the larger center hole.
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pedro sainz
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Posts: 1429

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PostPosted: Mon Nov 14, 2022 5:16 pm    Post subject: Re: oil breather washer hole size? Reply with quote

KTPhil wrote:
There is an open cell foam filter that fits into the spring, too.
https://vwispwest.com/filter-311115529a/
It tends to make an old soft/worn cap pop off, so it's often left out.
FWIW, the ISPwest washer drawing shows the larger center hole.


Yup
I don’t even have washers on my engines
Just the Cell Filter
I like my Cases to Breathe as Much Possible 😁
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