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----- Original Message ----- From: "Jim Adney" <jadney@vwtype3.org> > On 16 Oct 2003 at 14:07, Mark Seaton wrote: > > With the can disconnected the progression is much more > > even, though the takeoff from idle is far less stable and wants to stall. > > If your dist has both vac and mech advance, then the vac advance should only be > active while cruising. Thinking about it that seems strange as the vacuum take off is very close to the idle throttle position- as if it was meant to give the max vac signal at initial acceleration as I'm seeing- to coincide with the max richness from the accelerator pump. > > I removed the dizzy last weekend and took out the advance plate to look at > > the centrifugal bits. It all looked OK and free but I did notice that the 2 > > springs that attach to the weights are different. One has a longer loop at > > This is correct. If you look at the dist advance curves in the Bentley manual, > you will see that several of the curves rise, plateau, rise some more, and then > stop. I (shock horror, slapped wrists ) don't own a Bentley as the haynes covers most of what I need with the carbs but doesn't give the advance curves- does anyone have them scanned and available online, or could send them to me? > This port is in the throttle body, isn't it? Have you changed throttle bodies? > If so, consider changing back, but I don't know if you can mix and match > throttle bodies and carb bodies (are they even separate parts???) Yes they are! and yes I have but I put the original throttle plates on that came with this car and this dizzy so they should be matched. > I could be > wrong, but I don't think there would be any kind of leak which could do this > unless you have a crack in a casting somewhere. will check them again > Just disconnect the vacuum hose for now. See if that helps. On your dist, the > vac adv is just there to improve fuel economy while cruising (high speed, low > load.) I will have another look at it and try your suggestion and see what happens. BTW its a "J" model distributor (can't remember the other numbers) Thanks Jim for your advice once again! Mark Seaton, '73 Fasty, London ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org