One of the primary factors is engine speed. When a tractor turns 2000, there is way more time for the flame front to over pressure the remaining fule and air detonating it. The 6000 to 7500 RPM of a (then) hot engine allows the combustion to happen in 1/3 the time (about, and in milliseconds) Maybe one way to reduce detonation would be to put an adjustable stop on the advance, and set it back about 5 degrees from factory spec. I still think oil cooled pistons work well. Jim
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Today's Featured Article - Upgrading an Oliver Super 55 Electrical System - by Dennis Hawkins. My old Oliver Super 55 has been just sitting and rusting for several years now. I really hate to see a good tractor being treated that way, but not being able to start it without a 30 minute point filing ritual every time contributed to its demise. If it would just start when I turn the key, then I would use it more often. In addition to a bad case of old age, most of the tractor's original electrical system was simply too unreliable to keep. The main focus of this page is to show how I upgr
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