Quote:
Originally Posted by JEllis
Do the VAC bearings provide anymore space or is the tolerance the same as OEM?
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Unfortunately no they don't. VAC uses Calico Coatings to coat factory bearings. According to the Calico web site, the coating will add an extra0.0002 - 0.0004 inch thick coating. To put this into real numbers, that would mean your bearing clearance would be reduced from 0.0010 to a range of 0.0006 - 0.0008.
Here's a link to the Calico Coatings FAQ on bearing coatings. Note they recommend 0.0020 - 0.0030 bearing/journal clearance.
http://www.calicocoatings.com/faqs/Calico's CT-1 dry film lubricant used on engine bearings, valve springs, oil pump gears, timing and transmission gears is 0.0002" to 0.0004" thick and generally speaking does not need extra clearances. A benefit of Calico Coated bearings is the allowance for tighter clearances. Keeping in mind that bearing clearances of .002" to .003" are typical for High Performance applications.