Sorry for my cynicism, but Post 43 might have been ARP TQ-level induced failure. Agreed on the Damper culprit.
Custom 2-stroke unmanned aircraft engine busted the crank we made, during FAA endurance life testing. Professional metallurgy analysis showed the "SAE" 4340 steel billet (China!) has magnesium sulfide striations, that lead to early fatigue. Know thy Billet source !!
Factory PMD Cranks sound real good to me.
Last edited by Half-Inch Stud; 01-14-2023 at 09:52 AM.
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