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On 7 May 2004 at 20:39, Mark Seaton wrote: > Also I get 32 deg mech adv at 3500 whilst the specs say I should have 26 at > 3500 (a difference of 6 deg). So maybe I should just retime at say 2 deg > advance at idle to take care of that offset? (instead of 7.5) I'd recheck your measurements first, but once you're convinced that they're right, moving the idle timing is worth a try. > As for the vac advance there are more significant differences. The VW graph > shows that at 10cmHg I should be about half way through the advance at 6deg- > on my graph I'm only just starting at about 3 or 4 deg. Mine maxes out in > the 20-25 cmHg range where it should do at about 12cm Hg. I don't know the > accuracy of my vac gauge and will try to get a better one to re-do the test, > but this seems way out- actually the opposite of what I originally thought. > Maybe the diaphragm has stiffened up with age and is > causing that slower response. Yes, this seems odd. > The part number for the vac can given on the first page of that > bulletin is 311 905 271 F. All I could find on mine was the number 507 > stamped on the arm so maybe its not the right can. As Dave suggested, 507 is the last 3 digits of the Bosch part number. Unfortunately, there's no correlation between the Bosch number and the VW number. If you go to a repair shop that uses Bosch parts, they should have a Bosch catalog which should show your car, with the Bosch part # for the dist and the Bosch # for the vac can. I can't do it for you because my Bosch lit only lists US parts. Those 3 digits are the only identification you will find on the can. -- ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org