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> I sense also that there's the feeling here that all vacuum ports are alike, but > that's far from true. Some ports give a large vacuum at idle that decreases > with engine load. Some give a little at idle and that increases with load. Some > give more vacuum than others under the same conditions. ... and the dual vacuum distributor uses one narrowed orifice to achieve a difference between transient state and steady state vacuum response (I think!). Dave. UK VW Type 3 & 4 Club http://www.hallvw.clara.co.uk/ ------ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~