Help with decking or not?
Most guys who want things "perfect" would cringe if they actually knew how far off a "balance" job can be without any real world consequences.
While we tend to expect to see or hear a difference most engines will happily run hundreds of thousands of miles without any issues with an inbalance that would drive some folks crazy if they only knew.
balancing holes ? - Speed Talk
Thank you for that article link, Krooser. Just reading the 1st page helped me on one thing.... looks like very few in the industry, if any,
know the stock factory bobweights on various cranks. I've been looking for that info for a while, with no luck so far.
For the OP: The point I wanted to bring out in the balance tolerances is that if a shop says that the SCAT job was found to be '5 grams off' or something like that, then is still is a question of who is closest to 'perfect'. So when I read that kind of report, I always mentally question it. It is good to have it checked in case of a slip up, and in particular, if it is an internal balance crank set, to see if your TC/flextplate or flywheel, and damper are themselves in balance. I have to wonder how many well done, internally balanced crank sets are thrown off by not checking those external parts... I am raising my hand, as in 'guilty as charged' LOL!
Mountain, mole hill. The block needs squared up period. Otherwise you will have a different compression on each cylinder. And do mock it up while at the machine shop. We did mine with a brand new 408 Scat assembly and had three rods that needed the big end sized and had to purchase a new set of OVER SIZE main bearings because the set in the kit had ZERO clearance. Fix all now or pay latter.
Hey Donnie, this info of big ends out of size brings up memory of a thread here about a year back, where one of the professional shop operators here had found that some of the aftermarket rods would go out of round after a certain number of installations of the rod cap and torquing of the rod bolts to spec. Not sure what brand it was, or how often it occurred or maybe was one-off situation, but that was a eye-catching outcome.
