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----- Original Message ----- From: "Jim Adney" <jadney@vwtype3.org> > This is very odd. On dists with mech AND vac advance, the vac advance is almost > NEVER responsible for more than 10 crankshaft deg of advance. It is very odd, and I've never noticed it before. I will go out and investigate further in a while. > > I've heard Jim say that you should not see any difference with the hose > > attached and the car stationary so I'm guessing that this is wrong, and bad! > Is there any chance that the carbs you have are not the ones that came with > this distributor? Does this dist have a vacuum retard as well as a vacuum > advance? Well yes its true that these were not the original carbs, but they have the late throttle plate so they have the correctly positioned vacuum take off, and it didn't do this before- this is something new. No this is a simple mech/vac advance distributor and I believe it to be the original one. I've had it apart in the past and was suprised at what good unworn condition it all was inside. > Put a clean piece of hose on the vac can and suck on it while you watch the > timing. What happens? You'll know from this test whether you have a vacuum > advance, or perhaps a vacuum retard, and whether the spring is broken (I've > never heard of this happening.) I will check this today. > Were you the one who figured out that different stock carbs came with different > vacuum ports in different eras? Yes it was me, but I don't think this is the issue here as I set these carbs up to exactly match the originals, and they have the late style throttle plates which is where the vac is taken from on the originals. Mark ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org