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Old 03-18-2009, 12:26 AM   #1
All_talk
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Default Just Another Rod Bearing Clearance Question

How consistent should the clearance be around the diameter?

I’m measuring (with a bore gauge) 0.002” at the rod axis, but as you move to the split line it opens up to 0.003/0.0035”. The rod bores are very consistent (within a few tenths) and I can measure the slight thinning in the bearing shells out toward the ends. Normal? Or bad bearings? I’ve gotten the same results with two sets of shells.

ACL Duraglide bearings, standard size. Scat H-beam rods.

Gary
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Old 03-18-2009, 05:39 AM   #2
AKSubieDubie
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I pulled the internals out of my 5.4 ford modular block and the bearings only look worn 90 degrees from the split parts. That tells me that this "oval"-ness is normal?
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Old 03-18-2009, 10:49 AM   #3
All_talk
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I’ve been doing a little more research this morning and apparently what I am seeing is normal. The eccentricity is intentional and the “vertical oil clearance” is measured 90 degrees from the part line. I have only found one reference to how much eccentricity there should be, but it was not specific to Subaru applications.

“Bearings oil clearance specs are listed as "vertical" due to the eccentricity in performance bearings. Measure a performance "P" rod bearing with a bore gauge and you'll see they are about .002 wider at the parting line.”

Source: https://fordmuscle.com/forums/all-fo...clearance.html

These two documents from Clevite and ACL reference eccentricity but do not give any values.

http://mahleclevite.com/techbulletins/CL77-1-205R.pdf

http://www.acl.com.au/web/acl00056.n...7?OpenDocument

Anybody have a number to shoot for in a Subaru?

Gary
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Old 03-18-2009, 02:02 PM   #4
cooleys04
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The eccentricity is normal, it's to help prevent the bearing edge from "biting" the journal and spinning the bearing under high rpm.
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Old 03-19-2009, 12:20 PM   #5
RealStreet
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in the 10's and the bends

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It's good to see people checking clearances, you should check bolt stretch/vs torque or torque angle... The rod will change shape in reference to parting line vs vertical line. It is my experence that they are a little egg shaped.
It's never the rod bearing that give me a hassle. It's the fact that the block is a mess in the mains. It always seams like a decent amount of work to get the mains where I want them. Have you guys taken apart new stock engines to see how far from "correct" they are? Have you seen how the block "grows" with heat?

Jay Meagher

Last edited by RealStreet; 03-19-2009 at 01:54 PM.
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Old 03-19-2009, 12:33 PM   #6
All_talk
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I haven't got to the main yet. I still have to cut mt EJ22T case for the thrust on #5 (I'm running the phase II 2.5 crank). But I'll let you know what I find.

Gary
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