Quote:
Originally Posted by wmws
I don't believe the stock A crank was dynamically balanced. With a 3.78 rear and 21 inch tires 70 MPH is turning at 3100 RPM. That's a lot for a stock A engine.
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That is one of the biggest issues I encounter in this hobby today as I field phone calls for tech support is that hobbyists unfortunately have erroneous preconceived opinions that affect performance. As Kurt mentioned, the cranks were very well balanced as was the entire reciprocating assembly. When balanced that well, and because 60 mph is between first & second stage harmonics, help me understand exactly what is happening where the engine is supposedly destructing at 60mph? For example, don't just say the Babbitt is, ...specifically tell what is happening to cause the failure.