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davidw99
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Joined: September 04, 2003
Posts: 696
Location: Boston, MA
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 Posted: Tue Oct 18, 2005 6:46 pm Post subject: single-vacuum distributor? |
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I have a '73 Super with a stock engine and, I think, a stock distributor. The distributor has the donut on the side and one hose going to the carb. Is this a single or dual vacuum advance distributor? Does the dual advance have two hoses to the carb? If not, how do I tell them apart? If this is the single advance then the timing is 7.5 degrees BTDC, right?
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Dave
'73 Saturn Yellow Sports Bug that has undergone a full pan off restoration. "Herbert IV."
'67 Sedan. "Bellamy." Currently being "refreshed" and recently repainted. |
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John M.
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Joined: July 22, 2005
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Location: Boulder, CO
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| Posted: Tue Oct 18, 2005 6:51 pm Post subject: |
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A single vacuum advance distributor. Yes, timing would be 7.5 deg BTDC.
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Current: 1972 Beetle - 96V EV
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oc63rag
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davidw99
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Joined: September 04, 2003
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| Posted: Tue Oct 18, 2005 6:57 pm Post subject: |
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Thanks Guys. I've been timing this thing wrong. Read somewhere that the '73 should be timed at 5 degrees ATDC and never thought about the type of distributor I had.
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Dave
'73 Saturn Yellow Sports Bug that has undergone a full pan off restoration. "Herbert IV."
'67 Sedan. "Bellamy." Currently being "refreshed" and recently repainted. |
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Glenn 
Mr. 010
Joined: December 25, 2001
Posts: 76941
Location: Sneaking up behind you
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| Posted: Tue Oct 18, 2005 7:06 pm Post subject: |
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Does the distributor look like this?
This is a 034 SVDA which was stock in 73 and 74.
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Glenn
74 Beetle Specs | 74 Beetle Restoration | 2180cc Engine
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davidw99
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Joined: September 04, 2003
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Location: Boston, MA
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| Posted: Tue Oct 18, 2005 7:26 pm Post subject: |
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That's it. The notch on the pully, it that TDC?
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Dave
'73 Saturn Yellow Sports Bug that has undergone a full pan off restoration. "Herbert IV."
'67 Sedan. "Bellamy." Currently being "refreshed" and recently repainted. |
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Livens
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Joined: September 10, 2005
Posts: 555
Location: Louisville, KY
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| Posted: Tue Oct 18, 2005 7:52 pm Post subject: |
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| davidw99 wrote: |
| That's it. The notch on the pully, it that TDC? |
I have a 72 Super and the notch on the back side of the pulley is either 5° or 7.5° BTDC, I havent measured it to check yet.
Look to see if you have a dimple on the front(towards you) of the pulley thats close to the notch. If so thats TDC. But they may have changed it in 73.
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LedFloyd
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Joined: August 12, 2004
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Location: Somewhere outside Barstow
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| Posted: Tue Oct 18, 2005 7:52 pm Post subject: |
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So if I have an engine code reading B 6 119 ...... but a 009 dizzy, she needs to be timed statically at 7.5* BTDC, not at 0*?
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Failer
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Joined: April 16, 2005
Posts: 510
Location: South Austin
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| Posted: Wed Oct 19, 2005 4:00 am Post subject: |
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| 7.5, 5, 10 BTDC something like that. With an 009 YMMV, you just gotta tinker till you get the full advance you want. 7.5B is a good place to start. |
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davidw99
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Joined: September 04, 2003
Posts: 696
Location: Boston, MA
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| Posted: Wed Oct 19, 2005 4:44 am Post subject: |
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| Livens wrote: |
| Look to see if you have a dimple on the front(towards you) of the pulley thats close to the notch. If so thats TDC. But they may have changed it in 73. |
My notch is half way between two dimples. If I remember correctly, I tested for TDC with the pencil in the cylinder trick and the notch is TDC. I will test it again to be sure.
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Dave
'73 Saturn Yellow Sports Bug that has undergone a full pan off restoration. "Herbert IV."
'67 Sedan. "Bellamy." Currently being "refreshed" and recently repainted. |
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Randy in Maine
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Joined: August 03, 2003
Posts: 34890
Location: The Beach
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| Posted: Wed Oct 19, 2005 5:08 am Post subject: |
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| davidw99 wrote: |
| Thanks Guys. I've been timing this thing wrong. Read somewhere that the '73 should be timed at 5 degrees ATDC and never thought about the type of distributor I had. |
In general, if you have a distributor with a vacuum retard, in addition to the vacuum advance that everyone else has, the timing will be set to AFTER TDC at idle speed. Sometimes it is 5* and sometimes it is 10*, so look up your specs and set it correctly.
1971-1973 Engines with Code letters AE or AH were a dual vacuum dual advance distributor (DVDA) and the notch was at 5* ATDC, until Chassis # 11326474897 with MT and #1132690032 with the Semi Auto.
At that point the (which is generally about the start of the AK engine series) the factory distributor went to a Single Vacuum Dual Advacnce (SVDA) and both the correct timing and the pulley notch were changed to the 7.5* BTDC.
Of course over the past years many guy (like me  ) changed out bent and damaged pulleys with about anything we could find that would fit and worked.
You need to know the correct timing that your distributor calls for and properly mark your pulley so that you can time the engine correctly and also properly adjust your valves.
Do the pencil thing in the #1 cylinder and paint the pulley so you can find it with your real timing light. I used to use a chisel to put a notch in there at TDC and at 180*. 1 small line at TDC (l) and 2 small lines at 180* (ll). I like to put an additional line at 7.5* BTDC and another at 28* BTDC for total advance stuff.
Model airplane paint will work well with a tiny brush. Clearcoat will help preserve the lines. Taking the pulley off for cleaning, painting, and clearcoating is useful.
YOU STILL NEED A REAL TIMING LIGHT TO TIME A 009 AT 3000-3500 RPMS SO THAT THE FULL ADVANCE OF 28-32* IS IN. |
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davidw99
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Joined: September 04, 2003
Posts: 696
Location: Boston, MA
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| Posted: Wed Oct 19, 2005 5:27 am Post subject: |
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Thanks Rusty. Looking at my chassis and engine numbers I do have and should have a SVDA. I will check on the TDC mark on the pully. I know it would make sense to have the mark at 7.5 degrees from the factory and it might be but I want to be sure.
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Dave
'73 Saturn Yellow Sports Bug that has undergone a full pan off restoration. "Herbert IV."
'67 Sedan. "Bellamy." Currently being "refreshed" and recently repainted. |
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Randy in Maine
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Joined: August 03, 2003
Posts: 34890
Location: The Beach
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| Posted: Wed Oct 19, 2005 5:58 am Post subject: |
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More important is the number on the distributor. When you get it go here....
http://www.oldvolkshome.com/ |
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davidw99
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Joined: September 04, 2003
Posts: 696
Location: Boston, MA
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| Posted: Thu Oct 20, 2005 4:51 am Post subject: |
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I guess I do have a dimple on the rear part of the pulley. Never noticed it before. I will still check TDC with a pencil (on Friday, to busy till then) but if the dimple is TDC then the notch would be 7.5 degrees BTDC since it is about 1 centemeter away from the dimple. So, I have either been timing my car 5.0 degrees to far advanced or 12.5 degrees to far advanced. Either way, it probably explains why the engine tries to die when a load (like accelerating) is put on it. Does this symptom sound plausible for an engine that is timed to far advanced?
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Dave
'73 Saturn Yellow Sports Bug that has undergone a full pan off restoration. "Herbert IV."
'67 Sedan. "Bellamy." Currently being "refreshed" and recently repainted. |
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