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On 22 Mar 2003 at 21:28, Mark Seaton wrote: > From: "Jim Adney" <jadney@vwtype3.org> > > > On 21 Mar 2003 at 9:38, Jim Adney wrote: > > This is what the later (vac/mech adv) dists do, and the > > later > carbs that were made to work with them had their vacuum ports drilled > > > differently so they would provide the right vacuum under the right > conditions > > FOR THOSE DISTRIBUTORS. > > Wouldn't that be that they would need a vac retard to reduce the advance > under strong vacuum/load going up hill? You could do it either way, depending on whether the vac got stronger when the load increased or it got weaker as the load increased. THIS is exactly where the confusion comes from, because the early engines, those which came with vac only dists, came with systems which provided a vac which got stronger as the load increased (as the air flow increased.) The only late cars that I'm familiar with, that came with vac/mech advance dists, are the FI ones, so I'm hoping for some help from our European listees on this. The FI vac is zero under all conditions except med to high speed with low load (low throttle.) > > Can our UK listees confirm that late dual carb engines came with mech/vac > > advance dists? > > Yes- well mine did- that is assuming that it is the original dist-