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On 12 Feb 2005 at 12:42, Dave Hall wrote: > ... and the dual vacuum distributor uses one narrowed orifice to achieve a > difference between transient state and steady state vacuum response (I think!). Dave, could you explain this a little more? On the '72 FI cars, with a dual vac advance/retard there are 2 separate ports, in completely different places, to feed the 2 vac chambers. The mech adv continues to be dependent only on rpm, of course. -- ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~