If the machine shop set it up at factory specs it takes very little debris washed out of the crank to get stuck in a bearing and begin the process of destroying it, Spun bearings are usually more a case of insufficient clearance or Oil starvation..
Have a lot of people try to add me on FB but I have NFI who they are as I don't know too many of the members here by their real names...
That and I'm not into having 1000's of "friends" people on my list are actual friends.. ;)
Air turns corners fairly easily, it's not a Wet System so not a huge issue, in pipe though 1 x 90 degree bend is roughly equal restriction wise to 10" of straight pipe so will be adding some restriction.
Comes down to speed of the air though the piping, ideally you want to stay below Mach .4 (about 304 mph from memory) anything over this heats the air through friction.
You need to know the CFM you're flowing then choose a pipe diameter to keep it below critical, as for bigger pipes being...
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