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That agrees with the charts on their way to Mark. Centrifugal advance quotes 24-28 crankshaft degrees at 3800 (in fact it levels out at 1900), and vacuum advance is 8-12 degrees, giving a possible 40 (crankshaft) degrees of advance, including the 7.5 degrees at idle rpm. This is for the 311 905 205 AJ single vacuum distributor for the 1973 twin carb engine. The graphs of course show distributor degrees. Max centrifugal is given as 14 distributor degrees (28 crankshaft) so maybe your springs are a bit weaker than they should be - must be getting old. 850rpm is fine for manual. Dave. UK VW Type 3 & 4 Club http://www.hallvw.clara.co.uk/ ------ ----- Original Message ----- From: "Mark Seaton" <Markse@mo-sys.com> To: <type3@vwtype3.org> Sent: Monday, May 03, 2004 10:03 PM Subject: Re: [T3] Too much advance > Jim (and anyone else interested) here are my advance curves for the car > stationary: > > www.mo-sys.com/mark_eng_adv_curves.pdf > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org