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02-05-2024, 05:58 PM | #45 |
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Green-Eggs The Honda S2000 5W30 oil viscosity spec - which has almost the same bearing clearances as the S65 and revs to 8K RPM - makes me think about switching back to 5W50 might be actually worth doing in cold weather even with my B.E. Bearings? Any thoughts based on the recent information we now have? Just wondering.
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02-06-2024, 03:45 PM | #46 |
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Earlier S2000s revved to 9k!
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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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02-06-2024, 04:23 PM | #48 |
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Quite possibly, but it's also needed by the rod bearings. Haha. Imagine owning an E9X M3 and living in Alaska, Northern Canada or the Nordic regions of Europe where a 10W60 oil's cold flow pump-ability into the rod bearing in sub zero temperatures might be challenging. Reims have been written on BMW's choice of oil for the S65 but perhaps Honda knew something BMW didn't given the S2000s similar rod bearing clearances and 5W30 OEM oil viscosity spec.
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02-06-2024, 04:26 PM | #49 |
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And I'm guessing those earlier S2000s did that (9K RPM) using the 5W30 viscosity oil and all done with similar rod bearing clearances to the S65?
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02-07-2024, 03:40 PM | #50 |
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Not sure TBH.
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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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02-07-2024, 05:30 PM | #52 |
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Exactly. 10W is twice as thick as 5W in a cold winter climate. Hence, the concern for the S65 with tight rod bearing clearances in the winter when using a 10W oil.
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02-08-2024, 04:49 AM | #53 | |
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Not passing 2k rpm until oil temps are 70C or so though, where after 3k rpm till "full temp" is reached. |
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02-08-2024, 07:05 AM | #54 |
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10W gives a thick and nice grease lube during Winter time, worked nicely for my car during its first 13y of life time.... Not passing 2k rpm until oil temps are 70C or so though, where after 3k rpm till "full temp" is reached.
Haha. Grease lube is probably the right description for a 10W viscosity with OEM rod bearings, and given the tight OEM S65 rod bearing clearances. Perhaps BMW chose 10W60 due to piston ring clearsnces and or emissions. Meanwhile, no such dynamic red line, or warm procedure required by Honda I'm aware of with the 5W30 and similar tight bearing clearances. The below image is from the S2000 manual and a post on the warm-up topic from the S2000 forums. . . https://www.s2ki.com/forums/s2000-ta...ur-car-914811/ .
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02-08-2024, 07:06 AM | #55 | |
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What is the lowest operating temp for OEM 10w60? On the coldest days here, I've checked the temp before starting the car with bimmer link and it's about 5°C |
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02-08-2024, 07:16 AM | #56 |
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5 Centigrade = 41 Fahrenheit
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02-08-2024, 08:29 AM | #57 | |
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Btw this is "down south" in Stockholm, up north they reported -48C (-54F) in January... Up there Volvo counts... |
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02-08-2024, 08:44 AM | #58 | |
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02-08-2024, 01:05 PM | #59 | |
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The F20C (2 ltr, 9k RPM limit) and F22C1 (2.2 ltr, 8.2k RPM limit) are the ones fitted to the S2000. I'm going to see if I can find the oil and rod bearings specs for that, unless you already have? Btw, according to wiki the K20A2 has a redline of 7.8 or 7.9k, with a cut off of 8.1k or 8.25k RPM.
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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. Last edited by Assimilator1; 02-08-2024 at 01:34 PM.. |
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02-08-2024, 01:25 PM | #60 | |
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02-08-2024, 01:35 PM | #61 |
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Looks like Nutterbutter at a Honda S2000 forum has posted screenshots of the Honda manual rod bearing clearances and measurements (and Honda are fine using plastigauge too!), screenshots show the clearance spec new is 0.03mm to 0.054mm.
Oil spec seems to be 10w/30!
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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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02-08-2024, 02:32 PM | #62 |
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02-08-2024, 04:03 PM | #63 | |
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The F22C1 2.2 L in the AP2 went to 8.2k rpm I’ve owned two AP1 and one AP2, and combined mileage in the s2000s was ~225k marvelous miles! IIRC, there were no changes in oil viscosity requirements between the F20C and F22C1 - 5W30 for both engines. |
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02-11-2024, 03:24 AM | #64 | |
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Doesn't that give anyone pause for thought? Why is it only the S65 that is suffering such high (sometimes catastrophic) RB wear. Is there no significant difference between the S65 and all the other BMW engines with the same clearance, built in the same BMW factories for the same USA market that could account for it? |
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02-11-2024, 11:35 AM | #65 | |
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I make it simple, and I know everyone will flame me for this, and this is not a shot at your questions or anyone else’s: take total production numbers, then take total engine failures from STOCK vehicles (meaning never tuned or SC) and I bet the MTF is better than most cars and undefeated against any other engine that revs to 8300 rpm’s while being more than capable of running past 100k miles without being rebuilt. Sorry, BMW gave us a gem, some found ways to piss all over it for mythical rod bearing and low torque arguments and here we are: with boring, automatic driven turbo engines with as much personality as a dead donkey. Just my .02. Don’t miss the drama from these forums that seemed to rule this place from 2007-2018. Cheers, e46e92
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02-11-2024, 11:40 AM | #66 | |
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Again, this is what I’d like to call my opinion and not fact based statement backed by a multi-million dollar research project to confirm Cheers, e46e92
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