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Komissar Samba Member
Joined: May 18, 2008 Posts: 894 Location: Bucharest, Romania
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Posted: Thu Mar 16, 2017 4:12 pm Post subject: VJU 4 BR 8 distributor advance curve? |
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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. _________________ 1965 Sunroof Beetle
1972 Type 3 Squareback
1978 Skoda 105S |
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Glenn Mr. 010
Joined: December 25, 2001 Posts: 76948 Location: Sneaking up behind you
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Posted: Thu Mar 16, 2017 4:24 pm Post subject: Re: VJU 4 BR 8 distributor advance curve? |
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Yes, I'll post it later when I get home. _________________ 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
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Komissar Samba Member
Joined: May 18, 2008 Posts: 894 Location: Bucharest, Romania
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Posted: Thu Mar 16, 2017 4:25 pm Post subject: Re: VJU 4 BR 8 distributor advance curve? |
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Thanks. I appreciate this a lot. _________________ 1965 Sunroof Beetle
1972 Type 3 Squareback
1978 Skoda 105S |
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Glenn Mr. 010
Joined: December 25, 2001 Posts: 76948 Location: Sneaking up behind you
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Posted: Thu Mar 16, 2017 4:29 pm Post subject: Re: VJU 4 BR 8 distributor advance curve? |
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This was in the gallery, I should have one with both mechanical and vacuum at home.
_________________ 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
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Komissar Samba Member
Joined: May 18, 2008 Posts: 894 Location: Bucharest, Romania
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Posted: Fri Mar 17, 2017 1:44 am Post subject: Re: VJU 4 BR 8 distributor advance curve? |
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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. _________________ 1965 Sunroof Beetle
1972 Type 3 Squareback
1978 Skoda 105S |
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Lingwendil Samba Member
Joined: February 25, 2009 Posts: 3988 Location: Antioch, California, a block from the hood
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glutamodo The Android
Joined: July 13, 2004 Posts: 26325 Location: Douglas, WY
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Posted: Fri Mar 17, 2017 8:01 pm Post subject: Re: VJU 4 BR 8 distributor advance curve? |
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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:
_________________ Andy T.
IMAGE NOTE: It has been noted that Chrome based browsers may have issues in displaying my vast image library, which use non-secure links and are on an FTP server. Images should still be viewable if the link is clicked though.
I do not know how to fix this. All I can say is it all works fine for me with what I use, Firefox. |
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tasb The Distributor Distributor
Joined: April 27, 2002 Posts: 6371 Location: Pentwater, Michigan
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Posted: Sun Mar 19, 2017 7:33 am Post subject: Re: VJU 4 BR 8 distributor advance curve? |
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The vacuum canister delivers between 8 and 12 degrees of advance. _________________ Roads Scholar &
1957 Kombi low mileage 36 hp governor equipped M 178 Slow Drag Winner 2014, 2015, 2018
1965 hardtop Deluxe Microbus owned since 1990 M 620 factory 12 v 1500cc
1961 (October)Single Cab- Road Trip Workhorse |
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Frederik Samba Member
Joined: August 18, 2007 Posts: 578 Location: Sweden
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Posted: Tue Mar 21, 2017 1:55 pm Post subject: Re: VJU 4 BR 8 distributor advance curve? |
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There is a small difference early and late vju4br8, this is early (before mars 1956/ date code 3M).
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EVfun Samba Member
Joined: April 01, 2012 Posts: 5481 Location: Seattle
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Posted: Sun Mar 26, 2017 12:08 pm Post subject: Re: VJU 4 BR 8 distributor advance curve? |
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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.) _________________
Wildthings wrote: |
As a general rule, cheap parts are the most expensive parts you can buy. |
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tasb The Distributor Distributor
Joined: April 27, 2002 Posts: 6371 Location: Pentwater, Michigan
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Posted: Mon Sep 10, 2018 1:53 am Post subject: Re: VJU 4 BR 8 distributor advance curve? |
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Yes, but good for folks to realize that distributors have an aceptable range in their performance.
I've always quietly considered it overkill for data tables to suggest that distributors like the 1966-1967 models to be static timed at 7.5 degrees static. Few of us have the ability to set timing to that degree of accuracy. That explains the reasoning for the notches in the pulley. _________________ Roads Scholar &
1957 Kombi low mileage 36 hp governor equipped M 178 Slow Drag Winner 2014, 2015, 2018
1965 hardtop Deluxe Microbus owned since 1990 M 620 factory 12 v 1500cc
1961 (October)Single Cab- Road Trip Workhorse
Last edited by tasb on Sat Sep 15, 2018 9:03 am; edited 1 time in total |
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tasb The Distributor Distributor
Joined: April 27, 2002 Posts: 6371 Location: Pentwater, Michigan
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Posted: Tue Sep 11, 2018 5:58 pm Post subject: Re: VJU 4 BR 8 distributor advance curve? |
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EVFun, where did that data table you posted come from? Looks to be old factory parts/repair manual but I've never seen one with the intermediate advance data before. _________________ Roads Scholar &
1957 Kombi low mileage 36 hp governor equipped M 178 Slow Drag Winner 2014, 2015, 2018
1965 hardtop Deluxe Microbus owned since 1990 M 620 factory 12 v 1500cc
1961 (October)Single Cab- Road Trip Workhorse |
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tasb The Distributor Distributor
Joined: April 27, 2002 Posts: 6371 Location: Pentwater, Michigan
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Posted: Tue Sep 11, 2018 6:31 pm Post subject: Re: VJU 4 BR 8 distributor advance curve? |
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Some notes on the distributors in that table:
VJ,VJU 4 BR 2- was a short lived distributor version running less than 8 weeks starting December 1953.
VJ,VJU 4 BR 3 Basically the same distributor but with modified advance weight springs. Also short lived Janaury to July 1954. The VJU 2 and VJU 3 shared the same vacuum canister.
VJ/VJU 4 BR 8 date codes 2 and 3 M correspond to February and March 1956. The VJ 4 BR 8 was re-released in the mid 1960's as the "019" and "screamer".
211 905 205 B Interesting that they have included data for this uber rare distributor made by Garbe Lahmeyer in very limited numbers. This is the mechancial advance version of the "VW" distributor.
ZV/JUR 4 R 1 used in 1959 for just a few months only on Ghia's.
VJ 4 BR 25 released for 1960 Bastard 40 hp Bus re-released later as the "010". I've never seen a 211 905 205 H, and I don't think its a Garbe Lahmeyer unit so maybe the VW# for the BR 25? In the late 1960's it was badged as a 211 905 205 F along with the 010 designation.
113 905 205 B was the service department replacement for the 113 905 205 K used for 1966-67 Beetle and Bus.
ZV/JCU 4 R 3 the last of the cast iron SVDA distributors this one installed on type III for 1964.
113 905 205 P is a VW part # but then it's listed as Bosch! This was the first of the aluminum bodied SVDA's installed on 1968 semi-auto transmission Beetles. _________________ Roads Scholar &
1957 Kombi low mileage 36 hp governor equipped M 178 Slow Drag Winner 2014, 2015, 2018
1965 hardtop Deluxe Microbus owned since 1990 M 620 factory 12 v 1500cc
1961 (October)Single Cab- Road Trip Workhorse |
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EVfun Samba Member
Joined: April 01, 2012 Posts: 5481 Location: Seattle
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Posted: Mon Sep 24, 2018 8:35 pm Post subject: Re: VJU 4 BR 8 distributor advance curve? |
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tasb wrote: |
EVFun, where did that data table you posted come from? Looks to be old factory parts/repair manual but I've never seen one with the intermediate advance data before. |
It is in the Technical tab near the top of theSamba. In there you will find a section titled "Technical Instruction Manuals." In that list click on "Notes on Practical Work" and scroll down to Subject 13 "Ignition system." There is a lot more to that manual than just the advance curves for distributors.
I've been crawling through that whole section, slowly, and there is a lot of interesting stuff there! _________________
Wildthings wrote: |
As a general rule, cheap parts are the most expensive parts you can buy. |
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tasb The Distributor Distributor
Joined: April 27, 2002 Posts: 6371 Location: Pentwater, Michigan
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Posted: Tue Sep 25, 2018 9:11 pm Post subject: Re: VJU 4 BR 8 distributor advance curve? |
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Thanks for the directions! _________________ Roads Scholar &
1957 Kombi low mileage 36 hp governor equipped M 178 Slow Drag Winner 2014, 2015, 2018
1965 hardtop Deluxe Microbus owned since 1990 M 620 factory 12 v 1500cc
1961 (October)Single Cab- Road Trip Workhorse |
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