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----- Original Message ----- From: "Jim Adney" <jadney@vwtype3.org> > I think this sounds like a terrific idea. It seems to work really well- and I just read an article from a Porsche 912 board that recommended the same- so it wasn't an original idea ;) The thing is, the manifold vacuum is completely individual- there is no linking element to muddy the measurements, and the vacuum is VERY strong- you've got a lot to work with there. I was thinking about adopting Daves method, and was contemplating hooking up my Carbtune to the air intakes, but I was worried that the aircleaner links both sides, so the pressures would definitely crosstalk to some extent or other. Also there is far less of a vacuum there as the aircleaner is (idealy) an open link to the atmosphere. I'm sure that this method does work, and its far cheaper, but I got a new toy and wanted to play with it- and it did work very well. > The best way to do this would be to get a sensitive differential pressure gauge > and hook it up between the 2 sides. There is a brand of these that I always > have a hard time remembering: Helicoflex, or something that starts with Heli- > > That way you just have to watch one gauge, and keep the needle centered. An electronic pressure gauge would surely be the best, but the twin vertical columns of this device are very easy to read- you just try to keep them level with each other- they are well matched. In fact this is really just a modern and convenient manometer- with no fluid to leak. > For those of you with the dual balance pipe connections on each side, you may > want to think hard about which pair to choose. I think 1 & 3, or 2 & 4, but not > the diagonal combinations, because of the firing order (which is also the > intake stroke order.) I used 2 & 4 as they were the easiest to reach. I'm not sure that it would matter that much as they are linked internally (on each side) and there is a damper pipe with a very small bore in line to stop the columns oscillating too much. > You mentioned that one side of your engine fell more quickly than the other. I > wonder if this is a sign of a worn or misadjusted linkage. I reckon you could well be right there Jim- I'll have to investigate further. I know that my linkage is quite worn with noticeable play- probably the grease being displaced as the linkage settled down. Does anyone know of a source for new replacement parts for the balls and sockets? I saw someone using those "captive eye" bearing ends (no idea what they're meant to be called but they have a captive ball with a mounting hole through it ?!?) which looked cool, but a fair bit of work- if I could replace the original parts I'd prefer it. Mark Seaton '73 Fasty London ------------------------------------------------ To unsubscribe, E-mail to: <type3-off@vwtype3.org> For more help, see http://vwtype3.org/list/