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----- Original Message ----- From: "Jim Adney" <jadney@vwtype3.org > On 8 Aug 2003 at 21:11, Mark Seaton wrote: > > The carbs are stock Solex re-built/NOS so I believe them to be OK and I've > > been through a few of them to no avail. I'm pretty sure that there are no > > vacuum leaks, the dist is fine and there are no fuel leaks. The jets are as > > specified stock for a '73 1600. I'm beginning to think that there is > > something more fundamentally wrong/amiss. > > Is your vac adv working? Are you sure that it's actually working AND actually > getting vacuum. The only way to check for actual vacuum would be to monitor it > on the road. Hi Jim, well I'm not sure how I would do that. I will try diconnecting it today and see if it makes a noticeable difference. The can holds vac and moves the advance plate, and the pipe is good and the vac takeoff is where it should be so it should all work OK. > Are these the right carbs for this dist? I believe we had a discussion awhile > ago and discovered that there were different generations of our Solex carbs, > which were meant to work with different kinds of distributor advance > mechanisms. Mixing these up would cause your gas mileage to suffer, but I > suspect you have this all straight, because I think you were the one who > brought it to our attention. Yes I'm pretty sure that they are suitable. It was actually no better when I first got the car with its original carbs (THE original ones I think) In fact no matter what I have done to the car, and I think I have improved its general running/handling enormously, but I still and always have had this poor mpgs. This is why I'm thinking that maybe there is something more fundamentaly wrong- like it is not 1600cc, or something like that. > > I have enriched the idle progressively to about 5 turns out on each > > and am getting better mileage (but still only 20-22 mpukg) and a far > > smoother running engine. > > This doesn't sound too bad to me, unless these are imperial gallons, which they > probably are. Yes they are imperial :-( On my last fill up I threw caution to the wind and filled up with the super-duper expensive unleaded, just to see if it made a difference. Well it did- slightly! The exhaust note changed a little (hard to say how but it definitely changed) and the car seemed to run a little smoother, but possibly with a little less power. This is of course totally subjective and things like that seem to change regularly on my car, but could this indicate something? Like I have too much/not enough advance? I was really not expecting there to be any real difference between the 95ron cheap (not) stuff and the 97ron extra expensive stuff. Mark Seaton '73 Thirsty Pesky Fasty ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org