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VJU 4 BR 8 distributor advance curve?
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Komissar
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PostPosted: Thu Mar 16, 2017 4:12 pm    Post subject: VJU 4 BR 8 distributor advance curve? Reply with quote

Hello,

Does anyone have the specs (advance curve plot) for the mechanical and vacuum advance of the Bosch VJU 4 BR 8 distributor? (Stndard distributor for oval-era engines)


Thanks in advance.
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Glenn Premium Member
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PostPosted: Thu Mar 16, 2017 4:24 pm    Post subject: Re: VJU 4 BR 8 distributor advance curve? Reply with quote

Yes, I'll post it later when I get home.
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Komissar
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PostPosted: Thu Mar 16, 2017 4:25 pm    Post subject: Re: VJU 4 BR 8 distributor advance curve? Reply with quote

Thanks. I appreciate this a lot.
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PostPosted: Thu Mar 16, 2017 4:29 pm    Post subject: Re: VJU 4 BR 8 distributor advance curve? Reply with quote

This was in the gallery, I should have one with both mechanical and vacuum at home.

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Komissar
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PostPosted: Fri Mar 17, 2017 1:44 am    Post subject: Re: VJU 4 BR 8 distributor advance curve? Reply with quote

Thanks.

I would be interested to know the degrees of advance for the vacuum unit as well, and if possible the value of the vacuum depression itself.
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Lingwendil
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PostPosted: Fri Mar 17, 2017 3:54 pm    Post subject: Re: VJU 4 BR 8 distributor advance curve? Reply with quote

Tagging along, I just cleaned one of these up (0 231 115 040, actually, but who's keeping track Rolling Eyes ) and was curious what it should be at. Other than dirt and external rust, it looks NOS inside and is nice and tight.
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PostPosted: Fri Mar 17, 2017 8:01 pm    Post subject: Re: VJU 4 BR 8 distributor advance curve? Reply with quote

Komissar wrote:
I would be interested to know the degrees of advance for the vacuum unit as well, .


in my own little "gallery" here's the vacuum and centrifugal:

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tasb Premium Member
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PostPosted: Sun Mar 19, 2017 7:33 am    Post subject: Re: VJU 4 BR 8 distributor advance curve? Reply with quote

The vacuum canister delivers between 8 and 12 degrees of advance.
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Frederik
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PostPosted: Tue Mar 21, 2017 1:55 pm    Post subject: Re: VJU 4 BR 8 distributor advance curve? Reply with quote

There is a small difference early and late vju4br8, this is early (before mars 1956/ date code 3M).

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EVfun
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PostPosted: Sun Mar 26, 2017 12:08 pm    Post subject: Re: VJU 4 BR 8 distributor advance curve? Reply with quote

Here is some numbers from "Notes on the Practical Work" #13 a Volkswagenwerk Service School publication posted here on theSamba.

These motors don't run much advance as it looks like the later 36 horse distributor only has 14-20 degrees of centrifugal advance all in up around 3200-3600 rpm. The vacuum advance is 7 to 13 degrees. Total advance under load would then only be 21.5 to 27.5 degrees and max total advance only 28.5 to 40.5 degrees (wow, quite a range.)
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