"that use of the necesary higher octane in a higher compression engine is, of course, an advantage buttttttttt use of higher octane then necessary in a lower compression engine can even be detrimental"
Agreed.
The only way to take advantage of the power POTENTIAL of high octane is to have a high compression engine (8.8:1 compression ratio or higher) in a vacuum advance inginition system. However, even that is debateable in modern vehicles.
My 3.0 Duratech engine has a 10:1 compression ratio with electronic controlled ignition. I have noticed no differance in mileage or power when using the 91 octane instead of Ford's recomended 87 octane.
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Today's Featured Article - The Fordson F Ignition System - by Anthony West. A fellow restorer contacted me earlier this year asking for some help and advice on a model F that he was restoring. He had over a period of months spent a fair amount of his hard earned cash on replacement parts for the old "trembler" ignition. Sadly though all his efforts seemed to be a waste of time and money as he still couldn''t get the temperamental old thing to run correctly!! If i said that this was a little frustrating for him that would be "conservative" in fact the problem had reduce
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