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Mechanical Maintenance (Oil, Fluids, Break-In, Servicing) Everything related to the mechanical maintenance of the FR-S and BRZ |
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06-23-2021, 01:09 PM | #43 |
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Assuming cavitation is not an issue. Like I have said, I don't get an RPM/PSI correlation due to cavitation. Even at sub 220F oil temps I only hit mid 40psi at around 7k rpm.
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06-23-2021, 02:04 PM | #44 | |
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06-23-2021, 02:07 PM | #45 |
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But wouldn't lower oil temp reduce the amount of cavitation? I have seen many reports on this forums indicating zero oil pressure issues @ 220.
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06-23-2021, 02:09 PM | #46 | |
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https://www.ft86club.com/forums/showthread.php?t=76760
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06-23-2021, 02:21 PM | #47 | |
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06-23-2021, 02:23 PM | #48 | |
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Given the assumption is the oil pump is being restricted mostly by the inlet side, no. Easier to suck water through a straw then a milkshake.
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06-23-2021, 07:58 PM | #49 | |
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06-23-2021, 08:26 PM | #50 | |
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It was about the same/slightly worse with 5-30 on my car Sent from my iPhone using Tapatalk
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06-24-2021, 03:00 AM | #51 |
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This may or may not be relevant to the discussion at hand but I do find it interesting.
https://motoiq.com/resurrecting-proj...dy-oil-cooler/ In the comments they speculate that the bearings themselves aren't up to the task once they hit higher temperatures, and keeping them cool is the engine oil itself so if oil temperatures aren't kept in check it's the bearings themselves that start to fail. |
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06-24-2021, 08:02 AM | #52 |
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In the comments they speculate that the bearings themselves aren't up to the task once they hit higher temperatures, and keeping them cool is the engine oil itself so if oil temperatures aren't kept in check it's the bearings themselves that start to fail.[/QUOTE]
Interesting article. A quick google shows that modern car engines use an aluminum-tin-silicon alloy for crank bearing (coating) which in the tin-eutectic type (matrix types have melting points of 650C (1200F) has a melting point of 230C (446F). Oil temps in the hydrodynamic film however can reach 180C (356F). Do auto crank bearings have matrix type coatings or tin-eutectic? Found some evidence that it is the later. Lots of head space in any case. Low or restricted oil flow causes heat; heat kills bearing seems to be the kill chain. Hence why that pressure sag near red line always scared me. |
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06-24-2021, 08:03 AM | #53 |
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06-24-2021, 10:25 AM | #54 |
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06-25-2021, 11:08 AM | #55 | |
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When switching to 5W-30, I understand that you still got pressure drops at high RPM's. Makes sense as 5W-30 doesn't have a significantly higher cSt value above 212F (something around 1 cSt). But did you notice the pressure start to drop at slightly higher temperatures, or was it fairly identical to the use of 0W-20? What I'm trying to say is, if you had pressure drops starting around 212F on 0W-20, did you now see a change to something like 220F with 5W-30, or was it still at around the same temperature? This question may be a bit too specific and I don't know if you compiled such data. I am mainly becoming curious at what oil flow cSt value the pressures start to drop on our platform (that is if it is fairly consistent or within a certain range). From this I could potentially start to make some correlation as to what temperatures this would occur at depending on the oil weight being used. In addition, an approximate limit of oil temperature can be determined to be ideal prior to oil pressure drops. |
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06-25-2021, 11:19 AM | #56 | |
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I notice the pressure drop pretty much at operating temp or above.
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