Vacuum advance is separate from centrifugal.. (and is also 2x..
)You want 28-32 mechanical, then vacuum is on top of that (approx 50 total)
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| Mechanical Advance https://slantsix.org/forum/viewtopic.php?t=18448 |
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| Author: | 73dart_swinger [ Fri Jul 07, 2006 9:53 pm ] |
| Post subject: | Mechanical Advance |
How do you know how much mechanical advance is built into your distributor? |
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| Author: | emsvitil [ Fri Jul 07, 2006 9:57 pm ] |
| Post subject: | |
There's a number stamped on the governor........ (under the plate) It's usually something like 9R, 11R, 15R and is distributor advance in degrees. Double for crankshaft advance |
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| Author: | DusterIdiot [ Sat Jul 08, 2006 8:44 am ] |
| Post subject: | Pull it out.. |
You have to pull your distributor and pull the pickup plate to see what it has...I've done enough "hunting" I can roll the governor slot into a hole in the plate and see if it's short or long... If it's not stamped on the top, you'll have to pull the hairpin in the nose of the governor and pull it it should be stamped on the bottom. -D.Idiot |
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| Author: | 73dart_swinger [ Sat Jul 08, 2006 12:56 pm ] |
| Post subject: | |
Can anyone suggest a book or some other article for me to read about timing curves. I want to recurve my distributor but I just do not quite understand everything I need to understand to do this. Thanks for the help. |
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| Author: | 1sexy6 [ Sat Jul 08, 2006 2:39 pm ] |
| Post subject: | |
search under "distributor article" . Someone made a very elaborate distributor tuning article. it is an adobe file. It will tell you what you need to know and more. |
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| Author: | 73dart_swinger [ Mon Jul 10, 2006 4:31 pm ] |
| Post subject: | |
i take it that the number i am looking for is stamped on the vacuum advance can. mine is stamped 8.5R. How do you figure the advance now? 8.5 X 2 = 17 So to get between 28 and 32 degrees total, I need to set the initial to between 11 and 15 degrees at idle? Is this correct or am i way off base? |
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| Author: | emsvitil [ Mon Jul 10, 2006 4:52 pm ] |
| Post subject: | |
Vacuum advance is separate from centrifugal.. (and is also 2x.. )You want 28-32 mechanical, then vacuum is on top of that (approx 50 total) |
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| Author: | 73dart_swinger [ Mon Jul 10, 2006 5:08 pm ] |
| Post subject: | |
I am sorry that I am having such a hard time with this but I still cannot find this number. I have looked at the distributor, which is dissasembled, and looked in my factory service manual and cannot find a part labeled governor. |
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| Author: | Fopar [ Mon Jul 10, 2006 5:53 pm ] |
| Post subject: | |
Look at the peice that the little star wheel or point lobe is attached to there is a flat plate with two long slots cut into it the number should be stamped on one side up close to the center. |
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| Author: | CStryker [ Mon Jul 10, 2006 5:55 pm ] |
| Post subject: | |
See this thread, about halfway down.[/url] |
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| Author: | 73dart_swinger [ Wed Jul 12, 2006 5:29 pm ] |
| Post subject: | |
I understand what i am looking for now. i cant get the pin out of the distributor gear so i can remove the shaft. is there any other way to find out what the advance is? i am fairly sure that the distributor is original to my car which is a 73 model. thanks for the help. |
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| Author: | Slant Cecil [ Wed Jul 12, 2006 7:34 pm ] |
| Post subject: | |
The dist drive gear does not have to be removed. The shaft slides out from the top so the gear can stay. The hard part of disassembly is removing the small hairpin clip in the inside top of the shaft, below the rotor. What I do is spread the 2 prongs on the clip and at the same time apply a downward pull of the shaft. Once the clip is out of the groove, the shaft slips out. Here's an 8.5R vacuum advance canister, it's marked on the arm going to the breaker plate. This is NOT what I refer to as the advance plate.  Here's a 15R advance plate.  Here it is after I brazed the slot smaller and filed the slots to same length as what a 7.5R advance plate would be.  Here is the modified advance plate back on top of the weights. 
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| Author: | emsvitil [ Wed Jul 12, 2006 7:47 pm ] |
| Post subject: | |
You can always measure: A: the slot length B: the pin diameter. C: A-B = movement available D: C/X = degrees of advance X= .0157" |
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| Author: | Jeb [ Wed Jul 12, 2006 7:52 pm ] |
| Post subject: | |
Those are some great pics Cecil. I have a 10r governor that I am going to install in my Duster this weekend if all goes well. Maybe it will get this thing into the 18's. Do you have a close up pic of the hairpin you were talking about that holds the governor in place. I would kind of like to know what I am up against. so I can start gathering tools. Is the retainer pin as hard to reinstall as it is to remove. |
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| Author: | emsvitil [ Wed Jul 12, 2006 7:58 pm ] |
| Post subject: | |
The hairpin is under the foam oil keeper in the top of the shaft.... Looks like a bent up paperclip and is a real b$$$h to remove...... |
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