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Message: [QUOTE="dell30rb, post: 263044, member: 26861"] In :eek: 1928 the Cooperative Fuel Research Committee developed a detonation testing machine. Their single cylinder, valve-in-head, watercooled, 612cc test engine had variable compression. While running at 600 rpm, the engineers gradually increased compression until a knock indicator sensed detonation. The highest compression value that resists detonation is assigned a number. It is referred to as the Research Octane Number (RON). Unfortunately, the 1912 :eek: 1928-1912?????? [/QUOTE]