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03-23-2024, 08:28 PM | #1 |
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Rod bearings done at 44000 miles. Ugh
Figured as I have had high lead levels since 24000 it was time. Had bearings replaced and engine mounts replaced. While subframe was off had them install euro headers and tune out o2 sensors. Hardest part is trying to stay under 4k rpm for 600 miles before changing the oil and letting her rip. First post in what? Five years? Find me a good photo hosting sight and I’ll toss up bearing pics…they had some copper showing…
Also after my tune cruise control will not activate. Heard of that before? Going back to tuner Thursday.
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03-24-2024, 07:06 AM | #2 | |
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Rod and main bearings don't require breaking in, only piston rings do. 44,000k is a pretty short life span, are you doing a lot of track work?
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03-24-2024, 09:27 AM | #3 |
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If you've treated your engine right it must have had a really hard life in the hands of the previous owner(s).
Here's what the rod bearings looked like on my E46 M3 at 100K miles, it's an US import so it might have had a recall. But if/when I don't know. It's my strong belief that the rod bearing issue is highly exaggerated and heavily concentrated to the internet. I simply call it regular maintenance, keep in mind it's a race engine for the street. How many race engines lasts as long as the S54 does? Blows my mind really. Cylinder 1-6, Övre = Upper and Nedre = Lower.
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03-24-2024, 11:31 AM | #4 | |
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03-24-2024, 11:42 AM | #5 | |
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03-24-2024, 12:02 PM | #6 | |
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This was already a common guideline in the mid/late 90's when we got the euro s50 (s54 predecessor).
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03-24-2024, 12:12 PM | #7 | |
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10W40 is also an oil weight that is used by a lot of people that have a m54b30. Although it's difficult to say which engine runs hotter. The s54 takes longer to heat up evenly (cast iron block) but also has an oil cooler with thermostat. I think in the end rodbearings are just a part of life for the s54/65/85 owner. Calculated costs for high revving undersquare engines.
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03-24-2024, 12:49 PM | #8 | |
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I guess "I take care of my engine" is completely subjective.
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03-24-2024, 01:17 PM | #9 | |
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Compare that to say an m54, where pretty much no wear is showing all the time at double the mileage, also on supercharged versions. So rodbearing wear is a pretty certainty in owning an S54 and can be considered as a calculated cost. Loads of specialists here that specialize on this. A typical rodbearing swap incl parts/oil/filter costs here (germany) about €1400 (incl 21% VAT salestax), so thats 2.8eurocents per mile (or 3 yankiecents/mile). I think that's a normal additional running cost for a high rev engine, and not something to cheap out on (penny wise pound foolish) Still it's also not really known how the wear in the s54 is forming. To me it looks like cavitation wear. However that doesn't necessarily have to do with rpm. The oil pump pressure regulator piston in the s54 also wears. But indeed the "I take care of my engine" is very relative. Most s54 owners even don't put serious miles on their engines and inherit the miles of a previous owner. How many s54 owners here have actually put down say 100k miles themselves on their s54?
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03-24-2024, 01:49 PM | #10 |
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Car was tracked by previous owner yes. Knew it would need early service. Mechanic said the motor is in great shape. Warm up that oil people.
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03-25-2024, 11:54 AM | #11 | |
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S54: https://www.newtis.info/tisv2/a/en/e...arings/5rYXcUH https://www.newtis.info/tisv2/a/en/e...arings/5wRWhGB M54: https://www.newtis.info/tisv2/a/en/e...arings/6zJ8es4 https://www.newtis.info/tisv2/a/en/e...arings/79Vl9k3 My S54 in the E46 M3 doesn't have an oil thermostat nor does it run hot. On a track day during summer the oil never reaches over 100 degree and the water stays below 90 degrees, always. But I do agree that the rod bearings should be considered a service item on a S-engine. Edit: And if you compare to a newer engine like the N55 in the M2, the con rod play is even larger than the S54 and the recommended oil weight is 0W-30 to 5W-40.
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03-25-2024, 11:57 AM | #12 |
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I second this question. Completed a full blown track day in my coupe <400mi after a rod bearings and VANOS overhaul, joint trackside by the shop owner (and racer) who oversaw the work and expressed no concern.
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03-25-2024, 01:26 PM | #13 | ||
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But in truth I couldn't tell whether a thicker or thinner oil gives more cavitation under high g forces. And part of that cavitation might not even be caused in the rodbearings themselves as the pressure regulator piston in the S54 also wears, so that's bouncing around like crazy too. Quote:
Why?
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03-25-2024, 01:33 PM | #14 | |
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Yes, it's replaced with a dummy for higher flow and better cooling. https://www.mk-motorsportteile.de/en...mmy-m3-e46-s54
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03-25-2024, 03:54 PM | #15 | |
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Maybe ideal oil weight is more than just bearing clearance? Have you done a lot of miles/km in your z4m with the thinner oil? (like 50k km or more?)
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03-25-2024, 10:59 PM | #16 |
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I broke in my VANOS rebuild also for 500 miles to make sure seals seated properly. Met my mechanic in 2008 and he races also. But you do you. It’s just a preference from people I trust. Everyone has options.
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03-26-2024, 09:54 AM | #17 | |
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03-26-2024, 03:52 PM | #18 |
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I fully agree that the oil weight is just a band aid, and relies on higher temps that thin out the oil and be equivalent to what a 40 weight would be with lower operating temps.
I use 15-50w as I prefer to have a thinner oil weight span for more stability. I also add Ceratec or MoS2 additive. I am also of the believe that 10w60 is also a variable on bearing wear for street driven cars as it just flows more poorly during cold starts. |
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