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BMW 3-Series (E90 E92) Forum
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N55 Reliability (rod bearing problems?)
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04-30-2018, 01:18 AM | #178 |
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Stop Crying, Things Happen
So far the issues have been very limited to a small amount of cars. Under 15 or so and the reason(s) for the failures have not all been discussed. I would not worry about it unless your car is knocking or having oil starvation issues. I am at 124K miles and still going strong. Been tuned since 19k and have just been getting more faster and modified ever since. I am also a person who has probably driven their N55 harder than most and have not given the car any easy drive or day.
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04-30-2018, 01:25 AM | #179 | |
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Any reason why the M cars engine oil are kept to a much lower temp?
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04-30-2018, 01:52 AM | #180 |
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Last year I went through a summer of varying degrees of hard driving (with 0w-40 after switching from oem 5w30) and went 9k miles on one oil interval. I changed the oil and went another 5k and did an blackstone sample because I was getting paranoid from reading on the forums too much. Results came back clean and got what was expected. This was all on shitty cali 91 pump and NEVER RAN e85 on these two oil intervals. Its been about 5k from my last and will do another oil analysis. I can post my old results if anyone wants to see
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04-30-2018, 02:09 AM | #181 |
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Some people are saying the bottom of the n55 doesnt like alcool ( meth/e85 ) and after few thousands miles it can dilute in the oil if you spray a lot !
Its like it gets past piston rings and can cause a spun bearing in some cases.... |
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04-30-2018, 07:24 AM | #182 |
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Maybe E85 gets into the bottom of the N55. But meth has no way of getting to mix with oil it evaporators sooooo quickly there is no chance.. So that doesnt make much sense. But E85 thats another story.
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04-30-2018, 07:43 AM | #183 |
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Methanol is much more of a problem then ethanol. It's really useful for cooling but not so much for supplementing your fueling. Reliability, consistency, distribution between cylinders, and acid into the oil. Want a 10 second strip car? go for it... Want a reliable daily driver than does frequent short trips without getting up to temperature? I'd stay away from it...
Last edited by bbnks2; 04-30-2018 at 07:53 AM.. |
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04-30-2018, 07:44 AM | #184 | |
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Meth doesn't magically "evaporate" when it's sprayed in a sealed cylinder. It is going to interact with oil the same way as any other cylinder contents do during a combustion cycle. Except, methanol is much more damaging. Methanol produces the acidic byproduct everyone always trys to blame ethanol for. I am paraphrasing this from a whitepaper I read which i can't find a link to right now. I think it was from Ford or some other flex fuel car manufacturer. Last edited by bbnks2; 04-30-2018 at 07:52 AM.. |
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04-30-2018, 07:45 AM | #185 | |
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04-30-2018, 07:55 AM | #186 | |
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You have S65 guys that SWEAR by nothing other than 10w-60. Then you have others than won't run anything other than 30wt. Yet, bearings still wear quickly in both instances... Maybe it's just tight tolerances across 100k miles of abuse that does it? |
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04-30-2018, 07:57 AM | #187 |
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04-30-2018, 10:43 AM | #188 | |
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MEth is proven to work when used properly. So many platforms use it. Many people install shitty systems and cheap options that fail. BMW put meth/water injection on the M4... Meth evaporates quickly and burns like fuel inside the chamber. ITs IMPOSSIBLE for meth to get inside the crankcase. Even if it does its alcohol it will evaporate... Its proven to work so lets not spread personal theories. |
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04-30-2018, 11:00 AM | #189 | |
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I neve rsaid meth was his problem. I said that meth is worse than E85. I also said that I've never seen an E85 car show any signs of PROVEN fuel degradation on this platform (read up for the user who just posted a 9k interval using E85 and got back steller results). Prove me wrong with an oil anaylsis. E85 evaporates too. Hence, why the oil thermostat is set to 210f+ and importance is placed on getting moisture out of the oil with frequent hot sessions. The issue with meth is not in its liquid state (or evaporative). The issue is that carbon byproducts produced from combustion are acidic. The name esaceps me but the whitepaper I was reading differentiated it from the type of carbon byproducts produced from burning ethanol. Meth producing a significantly more acidic byproduct which will degrade oil add-paks faster than burning ethanol. Take that information as you will. I PERSONALLY said it was probably user error. Here is a great read from MAHLE on bearing failure: http://www.mahle-aftermarket.com/med...s-brochure.pdf Last edited by bbnks2; 04-30-2018 at 11:12 AM.. |
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04-30-2018, 11:35 AM | #190 |
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Oops small typo. Meant to say I never ran any ethanol mixtures on either of those two oil runs
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05-01-2018, 07:02 AM | #191 | |
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05-01-2018, 08:01 AM | #192 | |
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Not much you can do about the crank hub failure. |
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05-01-2018, 08:38 AM | #193 | |
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But people feel better when they know they are not alone. So a lot of speculation. For all that we know each and every one of these spun bearing fails could be a completely different cause... Every failed motor has to be torn apart and investigated before reaching conclusions.. I have not seen ONE N55 taken apart to be investigated for this issue. Not even 1. |
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05-01-2018, 09:42 AM | #194 | |
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05-01-2018, 12:32 PM | #196 |
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Looking forward to hearing your findings. I wanted to tear mine apart, but I couldn't afford to not get the core charge back from BMW.
The only thing I had to go off of was the mass amount of copper flakes in the oil and oil filter.
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05-01-2018, 02:05 PM | #197 |
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05-01-2018, 02:07 PM | #198 | |
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n55, rod bearing |
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