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> Vacuum Advance Unit, I think mine is toast
solex
post Jun 25 2006, 08:20 PM
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I finally got around to testing my Vacuum Advance with one of those Brake Bleeder/Vacuum testers. The larger port holds no vacuum and does not move the actuator, the smaller vacuum port holds a vacuum but for a very short time. I assume that this is part of the problem I'm having with acceleration/ deceleration both of which are not all together smooth.

Am I going about testing this correctly? Can I do anything to help other then purchasing a working vacuum advance? Where can I source one of these vacuum boxes?

Thanks,
Dan
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jim_hoyland
post Jun 25 2006, 09:21 PM
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Is this a 1.8L L-Jet ?
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solex
post Jun 25 2006, 09:37 PM
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75 2.0L D-JET
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solex
post Jun 26 2006, 09:00 AM
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Are these unit interchangeable with a VW brand such as this item:

http://www.aircooled.net/new-bin/viewprodu...IGD0007&cartid=
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Bleyseng
post Jun 26 2006, 09:08 AM
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No retard function on that one!
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tod914
post Jun 26 2006, 09:12 AM
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QUOTE(Bleyseng @ Jun 26 2006, 11:08 AM) *

No retard function on that one!


They have them both ways.."adv & retard" and " adv only". Seems about $50 or so cheaper than the porsche one.
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solex
post Jun 26 2006, 09:22 AM
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Does anyone know if it will work? Are these standard or are they calibrated for the particular application?

I emailed the tech support at Aircooled.NET and will let you know what they say.
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solex
post Jun 26 2006, 09:32 AM
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Just got back a reply and they stated it will work.
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Cap'n Krusty
post Jun 26 2006, 09:50 AM
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QUOTE(solex @ Jun 26 2006, 08:32 AM) *

Just got back a reply and they stated it will work.


It will work, BUT, the total retard may be different and the advance curve will be wrong. There MAY also be fitment problems, depending where the screw holes are on your distributor. However, the correct part is NLA, so it's the next best thing. The Cap'n
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solex
post Jun 26 2006, 10:21 AM
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Cap'n just wondering about your experience with this particular unit, is it a certainty that the total retard and advance will be wrong?


Thank you,
Dan
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solex
post Jun 26 2006, 07:34 PM
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I purchased one, I should get it later in the week. I will take some rough measurements on the advance and see how it compares.

Anyone have any measurements on the retard, e.g. how much vacuum versus the throw on the rod?
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Dave_Darling
post Jun 26 2006, 08:58 PM
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The factory manual has graphs for how much vacuum versus how many degrees of advance or retard. You can see a collected table of those measurements here:
http://web.archive.org/web/20000414125755/...ch/distrib.html

--DD
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solex
post Jun 26 2006, 09:01 PM
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That's great thank you.
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solex
post Jun 30 2006, 10:05 PM
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I got the new unit and it looked as though it was going to work; the advance seem to be about the same, when placed under vacuum the rod moved in approx. 2mm on both units.

Unfortunately the advance port is on the bottom of the pot and obstructs the distributor from being timed. I guess I will have to flip the bill for a new one unless some one has a working used one for sale?
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Rand
post Jun 30 2006, 10:25 PM
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Hope you have better luck than me.

My 75 2.0 vacuum RETARD canister is toast. No advance on mine. Haven't been able to find a part yet.
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Cap'n Krusty
post Jun 30 2006, 10:33 PM
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QUOTE(solex @ Jun 30 2006, 09:05 PM) *

I got the new unit and it looked as though it was going to work; the advance seem to be about the same, when placed under vacuum the rod moved in approx. 2mm on both units.

Unfortunately the advance port is on the bottom of the pot and obstructs the distributor from being timed. I guess I will have to flip the bill for a new one unless some one has a working used one for sale?


NLA for at least 10 years. Make it work. The vac ports are a long way from the clamping bolt IF the distributor is installed properly. Never seen one any other way. The Cap'n
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solex
post Jun 30 2006, 10:39 PM
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The vacuum advance port is hitting up against the oil filler/breather, not sure how to get around it. The vacuum pot points to the drivers side.

Any suggestions?
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solex
post Jul 5 2006, 08:02 PM
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I have attached a couple of pictures to depict the problme. Any suggestions on what I should do?

(a) cut the tube and slip on a rubber angle (If I can find one)
((IMG:style_emoticons/default/cool.gif) heat the tube and bend it, I'm afraid to damage the diaphragm
© Use the original vacuum advance unit and forget about the retard portion (what does this do anyway?)

Dan


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solex
post Jul 5 2006, 08:02 PM
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Picture 2


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jk76.914
post Jul 5 2006, 08:08 PM
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Can you INTENTIONALLY reposition the distributor 90 degrees off and make it fit? Then you could rotate your wires one position in the cap to make up for it. It'd have to be moved either 90 degrees or -90 degrees.

May be a dumb idea. I'm too lazy to go out and look at mine...

Jim
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