Bearing are oversized. If you want more clearance, get a smaller bearing.

 

Get the crank polished to size.

 

0.011 bearings will give more clearance than 0.010'' bearings... polishing the crank is for exactly that purpose not resizing, impossible to accurately resize by polishing ,,, except for a ten thousandth of an inch or so [0.0001'' 0.000015 say]

 

By your reasoning a 30 over bearing would be way too loose. In actuality, it would be locked up tight. A crankshaft is turned down or made smaller to remedy damage or wear. That requires a thicker bearing to accommodate the material removed from the crankshaft. Polishing the crankshaft would benefit the clearance desired.

 

.010X is .001" more clearance than .010". Otherwise measure your housings with .020" bearings add clearance needed and have crank shop grind to get what you want. Might want to have them use your micrometer to measure with too.

 

OP should just get the .010X and re check with them.

 

https://www.speed-talk.com/forum/viewtopic.php?f=1&t=53552&p=743349#p743349

 

If the crankshaft journal is turned .010", a .009" bearing will give .001" MORE clearance and a .011" bearing will give .001" LESS clearance that the -10 (.010") bearing will. These bearing shells (.009", .010", .011") can be mixed to achieve .0005" more or less oil clearance on each journal. In this example, you can mix shells of .009" and .010" OR .011" and .010" shells to arrive at your desired vertical oil clearance, but never a .009" and .011" shell. Hope this makes sense.

Usually target oil clearance on crankshaft bearings is about .0018" to .0030" and exact clearance may be achieved by mixing one shell of one size with one shell of the next thicker, or thinner bearing shell - per above notation.

 

You say you have .010-.015 clearance that is way to much clearance, Unless you meant .0010-.0015

 

I think the OP was confused about his measurements. Hopefully he has gotten some help with the project . . . . . . . .