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On 7 Mar 2001, at 20:21, Dave Hall wrote: > The 1500S engines were 8.5:1 CR and needed excessively high octane fuel - > Esso Golden Extra used to go into our '64 Squareback to stop it knocking! > What do people do now? Is timing retard the only answer? Petrol additives (which don't work very well) until you can rebuild and reduce the CR and resetup the carbs. - ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ------------------------------------------------------------------- List info at http://www.vwtype3.org/list or mailto:help@vwtype3.org