Agreed. The older gas engines from the 1950s run with very low compression ratios. 87 octane will cover their needs without knock or excessive heat easily. As pointed out by Gary current octane ratings would have measured several points higher back in the 1950s and 1960s.
If you are getting engine knock with 87 octane on a engine with less that 8.5:1 compression ratio you have a problem - and it sure **** aint the fuel. Its only when you get up to 9:4 or higher that octane becomes an issue (with pump fuel) - and usually only with mechanical variable ignition timing.
The Super H in 1952 only had a compression ratio of 6.1:1 and the Farmall 450 only had 7:1 compression ratio - well within the operating range of current 87 octane fuel. Running 91 octane fuel in them is a waste of money.
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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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