Perhaps the engineers relied too much on their slide-rules rather than extensive field testing. They may have assumed that with 50% more cylinders and no increase in displacement, the individual power impulses would have nearly the same amplitude in a higher output engine. On top of that, the higher power of the new engines came with a higher RPM which would have no effect on the slow speed bearings.
Some things can't be predicted. It's easier now-a-days with computer modeling. This is why we have 10 day weather forecasts as opposed to 2-3 day forecast in the '50s.
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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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