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12-18-2018, 04:37 AM | #45 | |
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Still interesting to understand BE's comment that the ACL shell is too open. Yes 0.073mm seem on the high side - even for a layman who only understand how to read data - but again ACL has been around for a long time so puzzles me that they should bring out a product that potentially brings issues. Believe ACL's target was 702/703 OEM clearance with HX adding the 0.025mm which would end up on 0.06 isch all according to Clevite's formula. Not arguing here btw, just curious to learn. Let's see if BE chimes in. Cheers |
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12-18-2018, 05:12 PM | #46 |
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Ha, just happened to come back here as a mate is looking to get an E60 M5 and looks like incidentally there have been some updates, and recommendations that HX is too much clearance...
So I've done over 7000kms on my HX now... all seems well, still on 10W-60 Castrol TWS. Also been running 8500rpm redline with the AlpineMS tune, everything seems/feels strong. Should I be concerned? Does anyone have a link to the same style of measurements of stock 088/089 and 702/703 bearings? Last edited by groovetek; 12-18-2018 at 05:28 PM.. |
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12-19-2018, 03:07 AM | #47 | |
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Heres BEs measurement, to my knowledge the only one comparing data: http://wiki.rcollins.org/core/index.php/Engine_Specs_-_S65_Rod_Bearings |
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12-21-2018, 10:29 AM | #48 |
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AutoTalent, not dicking around but bit curious to understand how you come to ACL HX 0.0610 – 0.0838mm clearance variance.
ACL’ own spec says 0.039mm (shaft max of 51.991, housing min of 56.000, bearing wall max at 1.985. ie 56.000-51.991-2x1.985=.039mm). You seem to be using a slightly different shaft spec which would end up on 56.000 - 51.9887 – 2x1.985 = 0.0413, no? While we’re at it I’m curious about BE’s spec here as well that from what I understand says clearance variance 0.0456 – 0.0711mm. Using the shaft dimensions on your page the way I calculate would give: Max clearance: 56.013 – 51.9786 – 2x1.9812 = 0.0721mm Min clearance: 56.000 – 51.9887 – 2x1.9939 = 0.0234mm Edit: And assuming I get the numbers right that would mean if there is something called Nominal clearance, ACL would end up on 0.084-0.039/2 = 0.0225 => 0.084-0.0225 = 0.0615mm clearance. I.e. FWIW right on target using Clevite's rule of thumb. While BE's Nominal would end up on 0.0721-0.0234/2=0.02435 => 0.0721-0.02435= 0.04775mm clearance. Please bare with me if I completely missunderstand something here, but my basic wondering is how the variance can be that “tight” with shaft and housing tolerance combined doesn’t seem to be. Thanks Nik Last edited by Helmsman; 12-22-2018 at 07:44 AM.. |
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02-16-2020, 11:01 AM | #49 |
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I'd be interested to know the answers to the above too ......
Although I think I can answer one of them (bar the ~0.023mm differences in journal size stats), they measured one set, so it would seem this one set is hitting ACL's tolerance range from the mid to upper end. |
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01-03-2022, 09:43 AM | #51 |
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BanjoPaterson160.50 Assimilator1591.50 |
01-03-2022, 12:24 PM | #52 |
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01-13-2022, 01:49 PM | #54 |
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01-19-2022, 02:23 PM | #55 |
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Yea, and HX + regular track use, meaning higher oil temps (so thinner oil for greater time) and for longer periods doesn't sound like a good idea to me.
I would go for mixed and measured ACL bearings if I were you, Mporium (Deansbimmer) sent a M&M set to me here in the UK, so I'm sure he could send some to the NL.
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Oil analysis for finding wearing rod bearings?. Collation of oil analysis reports with some rod bearing photos for the M3's S65. My categorisation of pulled rod bearings in the rod bearing condition thread. My updated 'Blown engines' list. |
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