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> > Higher octane allows an engine to operate with higher compression ratios. If > you use too low an octane you will get knock which is hard on an engine. Once > you have the octane high enough that knock does not occur there is no > additional benefit from higher octane. > > In some cases using higher octane may allow you to run with more spark advance > without knocking. This will generate more power, but the higher octane was not > the real source of the power, it just allowed it to happen. > Here in Australia we have Unleaded, Premium unleaded and Lead Replacement (don't remember the octane levels). The Lead Replacement Petrol (LRP) was introduced when Leaded fuel was phased out. I have heard reports that LRP is not very good for our aircooled engines, so despite using it I have been worried about it. I have also read reports that an engine in good condition (whatever this means) can use regular Unleaded with no problems. Any ideas on this? Petri '71 Notch ------------------------------------------------------------------- List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org