Some of those old tractor engines used an open combustion chamber without a quench or wedge design. Being a large displacement engines, lugging hard and having short cam timing due to low rpms. Which raises combustion temps and pressure. You can make a 7.5 to 1 engine detonate on 87 in particular with old gasoline, in high air and coolant temps. With some soot in the combustion chamber and/or hot plugs. Often detonation isn't heard but the spark plugs, piston tops, ring lands, piston rings, cylinder walls and rod bearings say otherwise. We have all seen engines with broken rings and pounded rod bearings and wondered how it happened.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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