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On 7 May 2002, at 7:22, Daniel Baum wrote: > I read yesterday that the stock static timing settings are based on the > assumption that you are using 90 octane petrol. This, I suppose, is what was > available in the US at the time. Over here, I am using 96 octane leaded fuel, > the only type of leaded fuel still available here. This is soon to be taken off > the market here too, so I will be left the with choice of 95 or 98 octane > lead-free petrol. The factory octane recommendation is a MINIMUM recommendation, so you can use anything above that without concern or adjustment. > Anyway, how should I expect the more potent petrol to affect the timing? It's not more "potent" it just has a greater resistance to knock (detonation, pre-ignition, etc.) > No, I didn't remove the vacuum hose. I only saw this mentioned as necessary for > later engines. The manuals all tell you to remove the hose(s) but there's no reason to if this has no effect at idle, where you're setting the timing. You can easily test this yourself by just pulling off the vac advance hose while the car is idling. I suspect that you'll hear no change in idle speed. > While on the subject of petrol, does anyone have any experience with the > additives used in leadfree fuel in old engines to simulate lead? I know the > proper solution is to change the valves so the car can use leadfree fuel, but I > need something I can use until I do that. When low lead gas was first introduced, there was concern about damage to valve seats and guides from the lack of lead. It turns out that this applies only to those cars which have the seats and guides made of cast iron, or have those parts cut straight out of the cast iron head. None of these concerns apply to any VW since about 1966. You are free to use lead free gas in your 69. - Jim Adney jadney@vwtype3.org Madison, WI 53711-3054 USA ------------------------------------------------------------------- Too much? Digest! mailto:type3-d-request@vwtype3.org Subj=subscribe