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EverettB 
Administrator
Joined: April 11, 2000
Posts: 67253
Location: Phoenix, AZ
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EverettB
Administrator
Joined: April 11, 2000
Posts: 67253
Location: Phoenix, AZ
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airschooled
Air-Schooled
Joined: April 04, 2012
Posts: 11975
Location: California sucks, don't move here
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 Posted: Tue Jan 20, 2015 6:43 pm Post subject: |
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So beautiful! Thank you!
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Learn how your vintage VW works. And why it doesn't. Now booking 2022 Lesson Days. |
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Tcash
Samba Member
Joined: July 20, 2011
Posts: 12843
Location: San Jose, California, USA
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| Posted: Sun Feb 15, 2015 11:35 am Post subject: Advance curve for Bosch ZV PAU 4R5 distributor |
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Tcash
Samba Member
Joined: July 20, 2011
Posts: 12843
Location: San Jose, California, USA
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| Posted: Sun Feb 15, 2015 11:36 am Post subject: Advance curve for 36hp bus distributor VJUBR8 |
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Multi69s
Samba Member
Joined: January 24, 2006
Posts: 5122
Location: Lefty, CA
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tasb
The Distributor Distributor
Joined: April 27, 2002
Posts: 6367
Location: in transition to northwest Michigan
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| Posted: Sun Feb 15, 2015 8:39 pm Post subject: |
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X2
Although I have to ad that some of those diagram labels do not ad up to a recognizable distributor - at least not for VW.
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Roads Scholar & distributor restorations
1956 oval third owner 36 hp- slow drag Champion 2012, 2014, 2015, 2017 sold to a good new home
1957 Kombi low mileage 36 hp governor equipped M 178 Slow Drag Winner 2014, 2015, 2018
1960 sunroof beetle owned since 1991 36 hp moved on after 32 years of stewardship.
1965 hardtop Deluxe Microbus owned since 1990 M 620 factory 12 v 1500cc
1961 (October)Single Cab- Road Trip Workhorse |
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67 Sunroof
Samba Member
Joined: February 22, 2014
Posts: 1836
Location: Salisbury, MD
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| Posted: Sun Feb 15, 2015 10:41 pm Post subject: |
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I'll be the first to ask.....awesome but what do they mean?
Which is right for me? How can I tell? |
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Juanito84
Samba Member
Joined: March 17, 2012
Posts: 2436
Location: Colorado Mountains
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| Posted: Mon Feb 16, 2015 10:30 am Post subject: |
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| '67 Sunroof wrote: |
I'll be the first to ask.....awesome but what do they mean?
Which is right for me? How can I tell? |
What do they mean?
These graphs show the acceptable advance curves for VW distributors. So if you have one of the distributors listed on any one of these graphs then all you have to do is check your advance curve(s) and see if your distributor is still within spec.
Some graphs only have one curve on them, measured against vacuum (mm HG) with no RPM listed. These are vacuum only distributors like the ones used on 1970 and older manual transmission VWs. There are some with two advance curves, one marked "a" (vacuum curve) and the other marked "b" (centrifugal curve). These are SVDA style distributors. The ones with three curves (one of them bends down) are DVDA style distributors.
Note that the degrees are distributor drive degrees. To get crankshaft degrees you will need to multiply the number of degrees by two.
Generally, this is just to make sure your distributor is within spec, not for chosing a distributor. Normally you would chose the distributor based off the number on the carb. But I suppose you could put it on a dyno and find a distributor with a curve that matches your engine even better.
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If a water cooled engine cools its water with air, isn't it just an overcomplicated air cooled engine? |
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67 Sunroof
Samba Member
Joined: February 22, 2014
Posts: 1836
Location: Salisbury, MD
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| Posted: Mon Feb 16, 2015 5:38 pm Post subject: |
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Thanks man! I have several of the above distributors. I have no idea which to use with my stock 1600dp with baby dells (34b) carbs.
I've been told the svda would be best (205) but have only dvda distributors. If I leave the retard advance disconnected I assume it would only affect the third curve?
Thanks again |
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Juanito84
Samba Member
Joined: March 17, 2012
Posts: 2436
Location: Colorado Mountains
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| Posted: Mon Feb 16, 2015 7:47 pm Post subject: |
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| '67 Sunroof wrote: |
Thanks man! I have several of the above distributors. I have no idea which to use with my stock 1600dp with baby dells (34b) carbs.
I've been told the svda would be best (205) but have only dvda distributors. If I leave the retard advance disconnected I assume it would only affect the third curve?
Thanks again |
Correct. Just leave the vacuum retard disconected.
As far as the curve, I'd try the most agressively advancing curve.
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If a water cooled engine cools its water with air, isn't it just an overcomplicated air cooled engine? |
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modok
Samba Member
Joined: October 30, 2009
Posts: 24773
Location: Colorado Springs
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| Posted: Mon Feb 16, 2015 7:52 pm Post subject: |
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Nice to see this info all in one place! Thanks.
now, I guess I need to get a better computer. it nearly locks up trying to load all those images  |
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furgo
Samba Member
Joined: September 06, 2016
Posts: 942
Location: Southern Germany
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| Posted: Mon Jan 15, 2018 8:51 am Post subject: Re: Stock Distributor Advance Curve Diagrams |
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This is a fantastic post, but every time I've tried to find the info for a particular distributor I've spent quite a lot of time actually finding the post in the first place. Once you've found it, you then need to look at all curves to find the right distributor, as the part numbers are only on the images, which preclude a quick text search.
As I found myself doing this for the nth time today, I went ahead and added the VW part number code to each image, so that the distributor curve can now quickly be found by hitting Ctrl+F on the browser and searching for it. This should also make this post appear on the forum/Google search when giving a distributor part number as search query.
While I was doing this, I noticed there were quite a few image duplicates, which I removed. If you look at the post source you can see which images were actually removed, as their file names are all in sequence and the missing ones can easily be spotted.
To the mods: if you find this useful, please feel free to update the original post with the extra info (or replace the contents), and then remove my post to avoid duplication.
Here it goes:
| EverettB wrote: |
With thanks to mikedjames for posting these in the Gallery
Legend
111 905 205 T vacuum control curve
113 905 205 K vacuum control curve
113 905 205 L vacuum control curve
315 905 205 vacuum control curve
315 905 205 B vacuum control curve
311 905 205 T vacuum and centrifugal control curve
311 905 205 S vacuum and centrifugal control curve
131 905 205 G vacuum control curve
311 905 205 Q vacuum control curve
311 905 205 P vacuum and centrifugal control curve
311 905 205 M vacuum and centrifugal control curve
311 905 205 L vacuum and centrifugal control curve
311 905 205 AK vacuum and centrifugal control curve
311 905 205 AJ vacuum and centrifugal control curve
311 905 205 AH vacuum and centrifugal control curve
311 905 205 AG vacuum and centrifugal control curve
311 905 205 AF vacuum and centrifugal control curve
311 905 205 AE vacuum and centrifugal control curve
311 905 205 AD vacuum and centrifugal control curve
311 905 205 AC vacuum and centrifugal control curve
311 905 205 AB vacuum and centrifugal control curve
311 905 205 AA vacuum and centrifugal control curve
113 905 205 AL vacuum and centrifugal control curve
211 905 205 S vacuum and centrifugal control curve
211 905 205 Q vacuum and centrifugal control curve
211 905 205 N vacuum control curve
211 905 205 P vacuum control curve
181 905 205 centrifugal control curve
113 905 205 AN vacuum and centrifugal control curve
113 905 205 AM vacuum and centrifugal control curve
022 905 205 P vacuum and centrifugal control curve
022 905 205 Q vacuum and centrifugal control curve
022 905 205 H vacuum and centrifugal control curve
022 905 205 E vacuum and centrifugal control curve
022 905 205 D vacuum and centrifugal control curve
022 905 205 A vacuum and centrifugal control curve
021 905 205 L vacuum and centrifugal control curve
021 905 205 K vacuum and centrifugal control curve
021 905 205 J vacuum and centrifugal control curve
021 905 205 H vacuum and centrifugal control curve
021 905 205 G vacuum and centrifugal control curve
021 905 205 F vacuum and centrifugal control curve
021 905 205 E vacuum and centrifugal control curve
021 905 205 C vacuum and centrifugal control curve
021 905 205 B vacuum and centrifugal control curve
021 905 205 A vacuum and centrifugal control curve
021 905 205 vacuum and centrifugal control curve
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furgo
Samba Member
Joined: September 06, 2016
Posts: 942
Location: Southern Germany
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| Posted: Mon Jan 15, 2018 9:59 am Post subject: Re: Stock Distributor Advance Curve Diagrams |
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One of the reasons I was looking for this post today was because I found a piece of information that relates to my distributor, for which there don't seem to be any curves available (although the data itself is on Bentley).
There is a M107 technical note on the late Michael Knappmann's site that, once translated from German, reads:
| Quote: |
5 - Ignition system
a - Distributor
4/1800 022 905 205 S
4/1800 021 905 205 P
[...]
The advance values for both distributors correspond to distributor 021 905 205 G (see Repair Manual section M 3.2/1-3 and M 3.3/5-20).
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A while ago I plotted the distributor curve for 022 905 205 S / 021 905 205 P (which are essentially the same part, the only difference being that ..205 P has a RPM-limiting rotor):
Comparing it to the curve of the 021 905 205 G distributor, and bearing in mind that on the diagram below the RPM and advance values need to be multiplied by 2 (they refer to distributor rpm and degrees, vs. crankshaft rpm and degrees on the above):
The curves look similar enough. Comparing the actual data from Bentley and the Repair manual, there seem to be just slight differences of 0.5 advance degrees.
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'79 Westy, P22 interior, FI 2.0 l Federal, GE engine (hydraulic lifters)
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