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On 4 Apr 2001, at 19:21, Joe Plowick III wrote: > I'll be running Dell'Orto 40's and it appears that the vacuum is > pulled from only one of the cylinders. Would this be enough? Or do I > need a distributor that contains a larger vacuum diaphragm to help > with the lower vacuum? More cylinders doesn't give you "more" vacuum. The problem here is not one of quantity or quality. It is more a matter of when. The FI vac advance needs a vacuum source that provides none at idle, none at full throttle, and some at cruising. After that you can start to ask how much. > I have the Fisher book (1970's ed. with the yellow cover!) and I found > that it didn't give much (useful) information on distributors. Is > there a newer version of this book that contains more info? They are the same. Read the chapter on Ignition. The second page has a few advance curves. There's really a lot between the lines here to digest and understand. It's not all just spelled right out. - ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ------------------------------------------------------------------- Too much? Digest! mailto:type3-d-request@vwtype3.org Subj=subscribe