07-24-2021, 03:05 PM | #1 |
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Difference between the m2 n55 and 335 n55
So what are the differences between the n55 engine in the m2 and the n55 engine in the 335?
What has been upgraded in the m2 n55 |
07-24-2021, 10:08 PM | #3 |
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07-25-2021, 05:39 AM | #4 |
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07-25-2021, 04:32 PM | #5 |
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All EWG equpped N55s (started the 2014 model year) have the following:
S55 forged connecting rods S55 main and connecting rod bearings The EWG N55 used the M235 has a forged crank The EWG N55 in the M2 has all of the above plus: S55 oil pump and baffle system Different hypereutectic pistons Different turbo manifold S55 spark plugs |
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07-25-2021, 08:33 PM | #6 |
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I made a comparison sheet across N55 variances as below. Hope it helps.
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07-26-2021, 01:27 AM | #7 | |
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Borrowed from ///M TOWN
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07-27-2021, 12:29 AM | #9 | ||
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So at the current moment I still am unsure if I believe they are fracture forged rods. Does anyone have any technical documents from bmw to actually prove it?
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07-28-2021, 12:40 AM | #10 | |||
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07-28-2021, 12:53 AM | #11 |
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Well just because it is common doesn't mean a car has it. I keep seeing that the rods are casted and can't 100% verify if they are forged based on the parting line.
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07-28-2021, 06:29 AM | #12 | |
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07-28-2021, 10:42 PM | #13 |
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Guys, see below. The same rod has been shared across N54/N55/S55 dated way back.
There're various sources to confirm forged rod for the M2/M3/M4. The same goes for the rest. Forged rod has been very common for turbocharged engine for a long time.
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07-28-2021, 11:45 PM | #14 | |
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1) real OEM uses chassis service dates from the date that the chassis was introduced to the date it was decompressioned regardless of engine changes. So you must be careful about comparing engine parts based on chassis info because it doesn't factor in all the engine types. For ex in this case only the n55 and s55 shared rods, n54 is not included despite real OEM saying a 2009 e9x car was there. What it actually means was the n55 in the E series shared the same rod but the system included the entire service date of the chassis which is a mistake. https://www.realoem.com/bmw/enUS/par...&q=11247586491 11247586491 - the n54's connecting rod part number and it's different. 2) I don't see a single source verifying that the m2 has forged rods, if you have them in a bmw technical document not some advertising review (they're known to be wrong just like when they said the m2 had a closed deck block) then I would love to see it. 3) I wouldn't say turbo cars commonly have forged rods. While some more high end cars do have forged rods for the factory most cars do not. They have cast fractured split rod caps, most turbo cars don't have forged rods or cranks because of the cost to make them. Maybe on more expensive cars or performance cars sure but it is not extremely common.
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07-29-2021, 12:08 AM | #15 | ||
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https://www.wardsauto.com/test-drive...gine-new-again They mentioned forged internal if you look closely. Applying to the rest of n55. I have no time nor internet derail further from the N55 topic.
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07-29-2021, 12:15 AM | #16 | |
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However it's still not a primary source (either bmws tech ical document, or a tear down confirming it) so it doesn't mean anything. Reviews literally don't mean anything because they just regurgitate marketing from bmw, that's what journalists do best - hence why for the longest time they thought the m2 had a closed deck block. I've looked at alot of n55 rods and I have a really hard time judging the parting line, it's border line too thin to be forged but a bit too thick to be cast. So it's so hard to tell for sure. The images I've been looking at don't help because no one likes to take side profile pictures of rods it's always the flat side which makes it super hard to look at the parting line. The best way to know for sure is if I had a rod to actually hold in my hand and look for the parting line and if it follows all the way through to the cap as well. Of course having a cast one and a forged one made for the same engine side by side to compare would be ideal - just like comparing a cast and forged cranks counter weights and parting lines. But I don't think it's possible because we don't even have confirmation of a forged rod. Overall I'm still really curious to see if it does have forged rods - if it does that would be so nice. If it doesn't well that sucks but not a deal breaker since it's quite stout.
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07-29-2021, 12:39 AM | #17 | |
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I'm not trying to start some crazy argument I'm trying to see if the m2 really does have forged rods and I personally really don't think it does - and I really hope I'm wrong. Edit - that article also says the m235i has a standard iron crank shaft implying that isn't forged.... So yeah a pretty crappy source imo.
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07-29-2021, 01:57 AM | #18 | |
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07-29-2021, 02:03 AM | #19 |
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Not really....
I wanted to see if the m2 and n55 really did have a forged connecting rod, and asked for sources. When confronted with inaccurate information or garbage sources I will debunk it or address it, I'm not going to let inaccurate information or weak "sources" stay there and cause more misinformation. If anything it is better to address inaccuracies or skepticisms immediately before it spreads around like it is the truth. Then you'll have huge arguments like if the car has a closed deck block or not.
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07-29-2021, 03:05 AM | #20 |
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Some of us clearly have training in critical appraisal skills and some do not. I always find it fascinating watching the two battle.
Thing is when you don't have these skills you don't know it and are open to misunderstanding at different levels. |
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07-29-2021, 04:05 PM | #21 |
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I forgot to mention that the n55 in the m2 uses the plastic diverter valve from the N20 instead of the standard rubber diaphragm diverter valve found in all other N55's. This means the m2's diverter valve is not susceptible to leaking over time so you aren't going to be in a rush to replace that part, and the only gain you will get from upgrading that is better throttle response.
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07-29-2021, 04:58 PM | #22 |
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Extra Grist to your Mill: The rods on the M2 are used on the M235i Racing, and the M4 GT4 (where they replace the earlier design). Two hypotheses arise from this, that require testing with physical evidence: 1. BMW is fitting the cheapest parts possible in the knowledge that race teams will replace them with items that are fit for purpose. 2. They are fit for purpose as is (and, that might mean they are forged, but might not).
In the meantime, hopefully the knowledge that someone on the internet is WRONG, isn't keeping you awake... |
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