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Is there a way of knowing the effective results of a lighter bob weight, Example// A engine with a 1800g bob weight turns 7500 vs the same engine with a 1600g bob weight turns 8500/ before failure

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Lighter weights free up RPMs.Before failure is is relative as to what fails.High RPMs will find the weak componants.Quality of parts and quality of machine work and assembly are more a determining factor at the bobweights mentioned.Check with the manufacture for any test data that supports their claims.For instance Oliver Rods has someone do distructive and non-distructive test on their various design of rods and well as metallergical studys on failed componants.