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BMW 3-Series (E90 E92) Forum
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N55 Motor is it Forged like its N54 brother?
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09-23-2011, 08:41 PM | #23 | |
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In post #130, he verified that the OEM pistons in his N54 were forged. |
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09-23-2011, 08:46 PM | #24 | |
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All he said was "Yes, OEM pistons are forged, and made by Mahle" How did he determine they are forged? So going by this mans word that he said "yes" means that he is correct? |
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09-23-2011, 08:50 PM | #25 | |
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So am I better off just flipping a coin?..honestly there has been numerous threads and feedback stating the early n54 r forged..so I really dont know what to believe |
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09-23-2011, 08:53 PM | #26 | |
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You dont have to take my word. Im just clearing misinformation, since there is ALOT of it on this board. Like I said, Im in the field, I may know a thing or 2. If you do not want to believe me that is fine. |
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09-23-2011, 09:42 PM | #27 |
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Please elaborate on how you came to that conclusion based on those pictures... Do you see the cast lines or something? I've seen forged pistons from a camaro that look exactly like that in terms of surface appearance. Of course I don't know anything without actually holding them in my hands.
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09-23-2011, 09:45 PM | #28 |
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N54 has a forged crank. There were pictures of this posted next to the N55 cast item - you could easily see the difference.
http://www.1addicts.com/forums/showthread.php?p=9766298 |
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09-24-2011, 12:31 AM | #29 | |
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Personally, I have a a very early build N54 (12/06) and I find it very hard to believe that some of the internals are forged. First of, we have never had definitive evidence of this other than someone here and there saying so. Second, why would BMW build a motor with forged internals without ever stating so in any press release or design graph. It seems like that would make them look very good in terms of PR and in the engineering of this motor. Third, forged internals are very very expensive when compared to cast counterparts, a BMW may be expensive but the company is still a mass producer and when it comes down to the bottom line putting in forged internals if they knew the cast irons were fine, just doesn't make any sense. With that being said, until someone from BMW or a BMW certified mechanic holds one of these pistons in their hands and shows to everyone and can definitively state they are forged and were forged for some reason on the N54, I will not believe it. In the year 2006, when the first N54 was made, the days of over engineering engines (i.e. Supra / EVO) were done. One other thing the 1M which came out this year and produces more power stock than any stock released N54 and is their highest performing N54 would have cast pistons as compared to basic 335s in 2006? Also having a forged crank (especially in a straight six) and not pistons? Sorry but none of this adds up.
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Last edited by Q4P; 09-24-2011 at 12:40 AM.. Reason: More Info Added |
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09-24-2011, 04:44 AM | #30 | |
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From what I remember Tony (e92fan) was the one who had CP Pistons develop a product for the n54. Sole reason being, the original weren't forged
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07-16-2015, 06:48 AM | #32 |
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07-16-2015, 05:22 PM | #33 | ||
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The N55 is a much newer engine compared to the N54, thus meaning less time for tuning extremes and quite possibly less N55 equipped E9X's--especially amongst the tuning world. I will say this though, the information in this thread is certainly welcomed. I have no doubt that in time, N55's will be able to push the envelope just as the N54 is currently doing. More support and interest in the N55 will come soon enough. |
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07-16-2015, 06:53 PM | #34 |
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Forged cranks are lighter weight and stronger Better for high rpm and power. Less rotating mass BMW probably included them in the n54 as it was their first production high performance turbo so they were doing a little overkill They eliminated them in n55 probably because they determined they were unnecessary for stock power output and cheaper. I haven't heard of either failing in either motor regardless of the power these engines are making but I'd still much rather have forged.
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07-16-2015, 06:56 PM | #35 |
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Not with the crank but I don't know if we will ever hit the cast crank hp limit. The forged is bulletproof. Other stuff will fail first. Probably valves or pistons. They're still cast in N54.
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07-17-2015, 12:13 AM | #36 | |
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Obviously the N54 crank is capable of handling more power however. In truth though, are we really going to push either platform to such an extreme? |
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07-17-2015, 06:46 AM | #37 |
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Forged is always lighter than cast. And yes u plan on pushing it to the extreme. The n55 doesn't have the setups yet to push those motors there yet so we'll see how it holds up when it gets there.
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07-17-2015, 01:55 PM | #38 | |
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it depends on a lot of factors and for something the same size, a forged part will be heavier. Unless you lighten a forged part (reliefs, cutouts, etc) of the same dimensions the forged part will always be heavier.
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07-17-2015, 02:07 PM | #39 |
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Realistically, does it matter if either one is forged or not. In most applications, it is probably doubtful that the capabilities of either lower end will be tested on the street. If someone wants > 600 at the wheels they most likely will have such a budget that they would be using boutique lower end internals anyhow. And drive the thing to the track on the back of a trailer. For the rest of us, transmissions and rear end infrastructure will probably fail first. For my 6 mt, I'd be lucky to see it go past 480 without slipping.
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07-17-2015, 02:08 PM | #40 |
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The N55/N54 do not have forged internals. This conversation came up at a party I was at. One guy was saying that the N54 is a better motor because it has forged internals and my buddy, who has been a mechanic most of his life, stated that the N54 is not forged. We know this guy really knows his shit so we left it at that.
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07-18-2015, 02:12 AM | #41 | |
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Everywhere I look, people say rods and crank forged on N54 citing BMW lit, pics of the motor torn down, etc. The ones that say it's all cast typically say my friend who knows told me. Lol |
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07-18-2015, 01:34 PM | #42 | |
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I'm not really quite sure why this whole question of N54/N55 forged internals keeps coming up. I'm thinking it all stems from that one engine build hoax from a while back. At this point, it has have been verified multiple times that neither are forged. |
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07-19-2015, 08:08 AM | #44 |
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