I am soooooo happy...., Niggling problem found and fixed Options

[porsche735]

So, after 7 years of blowing up pistons and mis-diagnosis, we have finally figured out what our problem was. (IMG:style_emoticons/default/mueba.gif) We found that even though our distributor was rebuilt and the curve tested, all that was tested was the mechanical advance. Our vacuum advance/retard canister turned out to have a leak on the retard side. This caused us to have about 40 degrees advance at points. Seems we should see about 33-35 total advance maximum (duh 27 adv with disconnect plus the 8 degrees of vacuum advance..http://www.dgi.net/914/tech/distrib.html). We are getting the new part this morning to cure this once and for all.
It has been very expensive over the years with the multiple rebuilds we have gone through (a few thousand). All for a $95 part.
One question I still have is about these A1 cardone remanufactured distributors. I got mine rebuilt by a shop and am buying a new vacuum canister. It seems like you could use this:
http://www.partsamerica.com/PartDetails.as...ype=218&PTSet=A

All I have found is the one for a 1.7L, but it seem sto come with the vacuum canister AND trigger points (same as 2.0L) for $51.99 plus $1 core at my local Kragen. This sounds too good to be true as the trigger points and canister are each about $100. Obviously, the canister is probably used, but tested to spec... but gosh...

Has anyone gone this route? You would have to throw away the distributor on the 2 liter cars, but seems worth it if you need either of the other parts. Are the trigger points new?

Anyone with first hand knowledge of this?

Chris

[Rockaria]

Okay time to give everyone my Stats since I have the EXCACT same problem and seem to not be geting a good answer. I have a stock 1975 1.8 with L-Jet FI. I am at 4,000 feet above sea level. Car runs hot with vac advance hooked up. It runs 15 degrees cooler with avance unhooked and plugged. I also get more manifold vacuum of the plemum at idle if I take off and plug the vac retard source (retard Leak? I think so...).

In the driveway I find these reading from the Vacuum source plugs:
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Manifold side: ( I am going to recheck these numbers)
RPM --vac inHg
850 -- 10
1500 -- 0
2500 -- 0
over 3 -- 0
----------------------------------------------------------------------
----------------------------------------------------------------------
Ported side:
RPM -- vac Hgin
850 -- 0
1500 -- 3
2500 -- 8
3000 --12
4000 -- 19
----------------------------------------------------------------------

Right now with the Vacuum disconected and plugged Here are my findings:
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Without Vac advace or retard hooked up
RPM --Timing
850 --Adv 7.5
1500 --Adv 17.4
2500 --Adv 29.0
over 3g --Adv never more than 32
----------------------------------------------------------------------
----------------------------------------------------------------------
With Vac Advance and retard hoked up
RPM --Timing
850 --Adv 3.0
1500 --Adv 22.1
2500 --Adv 37.8
over 3g --Adv gets near/over 42
----------------------------------------------------------------------

So I say What the F__K. I am having the canisters tested this afternoon and will reply. For now I have just disconected the advace and plugged it. The car seems a bit less spunky!

Any thoughts, Does this help, Anyone else have these numbers?