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i had my LS crank Micropolished / HEAVILY knife edged. following that i had it balanced. i rev it to 8500 tuned, neveranother interesting tidbit, as soon as a "newly balanced" crank gets covered in oil, spinning around in a fog of oil, it's right back out of balance. unless the crank in question wasn't in an engine when i obtained it, i wont have it balanced either. on the converse however, if a crank was not in a motor (meaning it was stored in someone's garage for xx amount of time) i'd have it checked for straightness and balance. if the journals are scored/galled in any way, i wont even bother trying to have it micropolished. cranks aren't difficult to come across, and not worth buying sub-par.
I see this has happened to quite a few setups, is it just from overreving or ppl not using ARP rod bolts and the stock rod bolts stretching? lack of oil, ie improper (non-vtec) oil pump used?
ok, that doesn't mean it was worth the money however. knife edging a crank will make the engine rev faster, just like getting a lighter flywheel. for a street driven car however, removing mass from the counterweights can cause more stress on the engine, due to increased harmonics. you probably had a nice setup, but unless i was building an all out race motor (something that i'm not interested in, i need to maintain some level of civility in my engines) i wouldn't knife-edge or balance. i'd just properly blueprint all clearances in the block, then move on to the head to make power. reliability is easily produced in the block, power easily in the head. in my opinion it's not worth it to try it the other way around, small gains for large compromises.