another rod bearing DIY (custom ACL/Lang) - Page 4 - BMW M5 Forum and M6 Forums
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post #31 of 58 Old 31st January 2019, 04:52 PM
flacoramos
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Jim I believe you've mentioned on FB a few times that ACL are not consistant, yet here you state you've never seen them before. Am I missing something?
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post #32 of 58 Old 31st January 2019, 05:13 PM
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I will call utter and complete BS on that statement. As a former moderator here, I've been privy to pretty much every discussion on this forum in the last 12 years even those deleted/locked/hidden The only reason that happens is when members can not follow the basic simple rules of the forum. There are zero politics involved in the exchanges here on behalf of the moderators or admins via sponsors or anyone else.



If someone has posted data and/or evidence on this forum it will remain. It's the exact reason you aren't allowed to edit a post after 24 hours and not one single member has been banned as a result of posting their opinion. It's difficult enough to get people who actually violate forum policy (spam, non-sponsors advertising, commercial links, etc).


I never said you removed information or deleted members for no reason.
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post #33 of 58 Old 31st January 2019, 05:16 PM Thread Starter
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I purchased two sets (H and HX) which I intend to take measurements on with actual metrology, not Plastiguess. Sunnen GA-2121 with CF-502 setting fixture calibrated against an NIST certifed calibration ring.
Too bad I already installed the Lang custom ACL H that I bought, I would have sent them to you for measurement.
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post #34 of 58 Old 31st January 2019, 05:19 PM
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Originally Posted by flacoramos View Post
Jim I believe you've mentioned on FB a few times that ACL are not consistant, yet here you state you've never seen them before. Am I missing something?
VAC. Those have in my experience been inconsistent. I ordered a set of non extra clearance bearings for a crank I had ground. Received extra clearance bearings. RMA'd them and the bearings I got back had no difference in packaging or marking and were extra clerance. RMA'd them and got a third set with identical packaging and marking which ended up being standard clearance. Of 5 sets of VAC I've used, I have seen approx .0003" variation through a set torqued in the same rod. Each bearing was torqued in place and measured, then switched to the next, repeated 3 times for verification. I believe it's most likely variation in coating thickness and not the shell itself, but clearance is clearance and I'd rather not have them all over the place down the crank.
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post #35 of 58 Old 31st January 2019, 05:24 PM
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another rod bearing DIY (custom ACL/Lang)

[QUOTE=flacoramos;7543310]Oh we're past that. Example #1: to compress a liquid... Given the ridiculously low oil-system pressures we're discussing, liquids are NON-compressible.



I’m trying to explain it simply, and compression of a liquid is a long winded topic. Sorry I couldn’t find the right words.

Last edited by sundaycruzers; 1st February 2019 at 04:19 PM.
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post #36 of 58 Old 31st January 2019, 05:39 PM
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Is anybody measured part worn bearings when both sides showing degree of wear up to copper ? When some layers of bearing gone, clearance should increase and give more lubrication needed, why this increase of clearance by wear don’t stop destroying bearings?
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post #37 of 58 Old 1st February 2019, 01:01 PM
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IMO, i'm guessing tight clearance is to even out bearing load during normal driving situations. i'm sure it has other reasons as well. we have engine turning at 8000+ rpm making 100hp/liter. it's also long and wide. every engine builder recommends higher clearance for FI and/or high rpm applications due to flex/journal deformity in those cases.

worst of all, we use 10w-60. tight clearance may be ok if the oil was thin as water, but ours stays thick. so i still don't see ANY downside to using wider clearance as long as oil pressure stays above normal for the oil we use. again, i love learning and would love to be shown otherwise.

as for piston-cylinder gap, that's completely different and not what we're talking about. not sure why that was brought up.

pav, i think it may be because the wear is uneven? oil flow may still be restricted at places where there's no bearing wear.

2006 E60 M5 with supersprint headers, mid pipe, and muffler without cat. Evolve R stage 3 tune.
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post #38 of 58 Old 1st February 2019, 04:19 PM
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[QUOTE=flacoramos;7543310]Oh we're past that. Example #1: to compress a liquid... Given the ridiculously low oil-system pressures we're discussing, liquids are NOT-compressible.


So what do you call it when oil is “blanked” through the gears of an oil pump? Squeezed, pushed? What is it. I’m not trying to piss in anybody’s cheerios, just looking for a way to explain pressure and what it take to make pressure..
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post #39 of 58 Old 3rd February 2019, 02:24 AM
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ACLs soon

dropping the M5 off tomorrow at MRF Engineering in Lake Forest to have ACL,s installed .
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post #40 of 58 Old 3rd February 2019, 04:22 PM
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Thanks once again Jim, flacoramos for sending me back to research, what I know and what I think I know. I believe there is no definitive answer to attain perfection for the s85. But with this community we can find solutions. Unfortunately mostly through failure.
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