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Old 05-23-2018, 05:42 PM   #1
Hyper
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Default Trying to identify King bearings (pics)

I was looking through my friend's stock, and came across odd box of King bearings, I have not seen before

pictures of current box on left VS old? on the right





Also on the bearings, one of the letters is missing on the engravement




What are they? Reason is, I can't find a set of STDX bearings locally, and they are what I am after, but I have not seen this type of box before, and missing letter on the bearing concerns me

I know, there was some point when King changed bearing design, but I believe it was true only for their mains #5
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Old 05-23-2018, 11:14 PM   #2
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Box on the right is the older style rod bearings with .001" more clearance.

Box on the left is the newer ones, but depends on which newer ones. They've done some oil hole revisions over the past few years.
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Old 05-24-2018, 04:42 AM   #3
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is there a point of running the old ones, or the revisions were not critical/any better?
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Old 05-24-2018, 09:57 AM   #4
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They made the oiling revisions to the main bearings...after a bunch of us Subaru guys actually explained to them how our oiling works
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Old 05-24-2018, 09:59 AM   #5
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yep, I got an email from King confirming they are genuine but old production, and that improvements have been made, so will be ordering a set of new ones
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Old 06-08-2018, 11:19 AM   #6
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Yet another question, this time on rod bearings

I don't have an old STDX box, but it was identical the the STD in the pictures. The new set of STDX I received has different label and the box itself is smaller dimensions

it got me concerned after I measured them to be tighter than the previous set of STDX that I ran

any ideas?







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Old 06-09-2018, 10:01 AM   #7
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Definitely something is changed, or they are knock-offs?

here is what the bottom side of the "new" bearing look like



this is them compared to "old" STDX



notice the markings are on different side of the tang

here are "old" STD



markings are also located on different side of the tang

Measured against STD size (both are new from the box) in the rods - they are loose by only 0.008mm (0.000315") which is nowhere close to their claimed 0.001" extra clearance

Last edited by Hyper; 06-09-2018 at 12:30 PM.
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Old 06-12-2018, 11:53 AM   #8
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Another update

I bought ACL 4B8296HX - extra clearance bearing, like King CR4125 STDX, and tried them out today

Here is what it measures in mm with King STDX



And here is ACL HX

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Old 06-13-2018, 08:03 AM   #9
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UPDATE!

kudos to Ian @ Map Performance for looking into this, and solving the mystery

Quote:
Originally Posted by maperformance
Yo! OK, so it looks like two things have changed on these. Subaru bearings specifically now have their Pmax Black coating to protect against metal to metal contact, as well as from the erosive effects of cavitation, or oil starvation. Basically made of nano composite particles to help with seizure resistance, and wear resistance. They also re designed the oil groove from the standard Y groove, to a new U groove design. This allows them to increase the surface area that would normally be removed from the machining process used to create the Y groove.

Hope that helps!

-Ian

so be aware of the new clearances with Kings
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