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 - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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