Differences Between the BMW S55 & N55 Engines | FULL BREAKDOWN! 

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If only the engineers had figured out how to put in a key-way or pin hole into the crankshaft on the S55. Lol

Might be a bit late, but the statement about the changed stroke + bore of the S55 is not correct. It is exactly the same as in the N55.

BMW actually put a N55 in a M car which was the M2 and its predecessor the 1M had the N54 another M car without the S engine designation. Then you read the forums about people saying the 1M got a N54 for a reason and the 335is. But in stock form the N54 is more capable. The M2 became a true M car to me once they fitted it with a S55. For my ranking of these engines its S58>B58>S55>N54>N55 because reliable power means everything! Only setback is the S55 crankhub if you fixed that you can move it passed the B58.

Very good engine, if only they had 🤷🏾‍♂️ design a pin lock system for that crank hub.

Wow that's just insane. Good info!

Omg! 3 more electric water pumps to replace!!! One is enough! Lol

Ton of great info, thanks 🏁

You should compare the S55 with the modified N55 they used on the first model M2.

Would have been nice to compare the N55B30TO vs the S55 rather than the standard N55B30O0

Excellent video!! Thank you very much. Wow, BMW went all out on the S55.

I have an f80 m3 (pure version) with s55 engine. can honestly say I've never had the gas pedal near full throttle as its just scary fast. have to take it to track to fully explore. It is a race car for the road. Almost nothing beats it

Is it possible to switch from n55 to s55 in a 2014 535i xdrive?

What about M2 N55 variant?

Excellent video dude. Thank you for the education!

very informative video loved it!

Great research. Great job 👍

The difference is one is sick and one is super sick

s55 is a track/racing engine n55 is daily/street regular car engine. s55 can withstand more but is also more expensive in repairing/maintaining. Judging the fact that n55 cars are half the price of s55 I am happily owning my 640i with n55 XD

Has anyone figured a way to put the twins from a s55 to a regular N55?? I'm curious!!

Great vid

i owned a mineral white e92 n55 and now i bought a mineral white m235 i love it

Isn't the bore and stroke of both n55 and s55 is the same? I've just searched that aftermarket piston for the s55 is same as the n55.. Just point it out.. Btw I'm sorry if I'm wrong..

Good informative video thanks.

Whats the normal oil consuption on n54?

Could you do an engine swap with a 1 series? Replacing the S55 for the N55?

You quoted the bore and stroke for the S55 as 89.6 x 80mm this gives 3,026cc. Something wrong there. :) N55 B & S 84 x 89.6 gives 2979cc ....correct.

Bore and stroke are exactly the same on S55 and N55.

N54/55 😍 .... n63>s55 for performance?

So basically 4x the parts that can go wrong on the s55

So many components to break down. You'll have plenty of material for your channel

Wow that’s helpful

Thank you

Driven one with 600hp and yes it's very very fast 3.5 to sixty easy

Thats a lot of waterpumps to go bad there lol

n55 doesnt have forged crank and rods

💚💙💛🧡 Great video content 💚💙💛🧡

Hi. Your videos are good I've been following it for a while now. I just wanted to know, is it sure that the N55 has forged connecting rods? From what I've read, the N54 rods were forged along with the crank, but the n55 is complete cast iron. I may be wrong I'm not claiming you are wrong either, just wanted to confirm my thoughts. Thanks

The crankshaft in the S55 is also a few pounds lighter than the N55.

انت من وين .؟؟؟

S55 Crank Hub........

S55 = more SHIT to break down! More fucken money to throw away. 😂

S55 is the worst sounding bmw engine ever. Rubbish.

I have an m4 competition..I can tell you for a fact the s55 rips! Id say reliable too. Ive taken it literally across the country. Zero problems.

Thanks for the information, I think I'll go for a N55 for my next BMW as I want to get a M2 I can work on myself, I am not a drifter so I think it will be satisfactory. The S55 sounds overly complicated with more failure points, admittedly it would be cool to have more power but I like to be realistic.

The S55 is a masterpiece. I can’t wait to see what BMW have done with the S58

Dude, you freakin killed it with this 🤙🏼🤙🏼

So the block, pistons, crank, turbo's, manildfolds, etc are all different. So how the hell are 75% of the components shared??

Great video

Hi everybody, just a note- the N55 does not have a forged crankshaft in MOST applications. There are a couple exceptions including the M2, F26 M40i (yes, the X4 did NOT initially use a B58) which have truly forged steel cranks, along with the Alpina variants. The M235i, LCI M135 (and ActiveHybrid 3 if anyone gives a shit or owns one) are oddballs... They have cranks that are made from a stronger steel, rather than the iron in the other N55 variants. if you have a 135, 335, 435, 535, 640, X3, X4, X5, or X6 with an N55, you have a cast crank. This is a common misunderstanding, and I see how easily this info can be confused so I don't fault you for it. It's just worth knowing if you are trying to build these engines, it's what I do for a living. Thanks for reading!

4 Water pumps!! oh helll naaah!! every bmw owner lol

I'm sticking to the n55

Doesnt the n55b in the m2 come with a dual sump to fix the oil starvation issue?

Great video Omar! There’s a lot of things about the S55 that I didn’t know

Fantastic video, this is an engine geeks paradise! Had no idea there was that much difference in the engines, makes you appreciate the BMW engineering even more! I’m about to buy an m135i so this is amazing

Yeah that cooling system is scary! I complain about servicing the one on my n54, can't imagine that one plus M tax 😭 M2 non comp might be the best of both worlds in that area.

Very informative! R u planning on making a video about s55 vs s58? On paper they both have rather similar specs but I'd love to know more about what bmw have done to improve the design

Yes S55 more sheett to break down and fix! There goes your damn wallet.... Ill keep my n55 6 inline engine as its way easier to work on! Enough power for me!

I'd of been more interested in a S55 vs B58 engines.

Would love to see a 2022 version of this video comparing B58 vs S55 considering you can find both engines around 30k nowadays. Who takes the cake for reliability, performance and maintenance? 🤔

Think I'll just build my n55 😂

GREAT VIDEO! You have balls! The last time I tried to explain the differences between the S55 and N55 to owners of the N55 I literally got all kinds of profane comments stating I didnt know what I was talking about. People have this belief that you can buy the cheaper alternative and achieve better results than the more expensive model without doing extensive upgrades. Rule of thumb: engineers get paid larger salaries than we do to increase hp in todays cars reliably and the companies charge you for the extra engineering. There are a lot more differences than you explained in the engineering of the entire S55 F80. You are right it would take you an hour to explain them. Lol

The noobs complaining that an s55 will cost more to maintain, are the same dudes that drive around all day with a check engine light in there N54. If you're able to afford this car, you should be able to afford the maintenance.

Great graphics. Do you know how much can a stock N55 turbo push?

S55 has same bore and stroke as N55: 84.0mm bore and 89.6mm stroke.

Quite educational. I am looking forward to the 1 and a half hour long version of this topic.

Very informative. I really enjoyed the video.

An engine with 4 water pumps and 8 radiators should be illegal to make.

Love my m3

Thanks for the very insightful video.

Very informative. Thank you!!!

Great job on gathering all that information! I definitely enjoyed watching this video, and also learned some facts from the S55 I didn't know.

I have a 2016 F82 M4 Competition and I must say that this video was a real eye opener about my S55 engine! Great engine, great car, great daily driver and an equally great video! Kudos and enjoy your new M4! 👍 🏁🏎

Me: it’s just a body kit, new chassis, and some engine upgrades. Also me now: ohhh yea it cost more for good reason.

The BMW God Has Spoke.

Love these types of videos that you produce. Keep up the great work man!

Didn’t watch the video but S55 is a way better engine in every category, Except sound!

Absolutely love the visuals! The S55 looks like an absolute nightmare as far as long term reliability goes. But hey, gotta pay to play right?

I just got a 2012 335i with the n55 and I want to mod it but before going to stage 1, are there things I should do to get it ready for stage 1( im a noob when it comes to tuning rn lol)

Thank you

Did you just said N55 share the same forged crank and rods just like S55?!

N55 and b58 difference or n54 and b58

Very reliable and durable? How many miles do you have on this? Modern bmws start coughing up oil, ps fluid, water pumps etc at 60k miles.

Joey!

No wonder Asian performance cars don’t quite compare to German cars and myth of reliability , if it’s too complicated then it must be unreliable but the only unreliable issue is the myth.

so you said under G force, the N55 can have problems, will it on my X4 35i, if I drive hard in twisty roads? thanks!

So the s55 it’s better technology better and performance

The bore and stroke you quoted for the s55 isn't correct, they are actually the same as the n55. 84mm bore 89.6mm stroke.

So N54 used twin turbo , then N55 went to single turbo ( cause its better ) now we are back to twins ? hope they fixed waste gate rattle issues

So basically the s55 is completely different from the n55...minus being a straight 6 lol

Is the N55 in the 2015 BMW X4 35i reliable? will it have rod bearing problems?

What happened to the carbon mirror caps?? Great video though!

Lol as a 2011 happy n55 owner I love my 335 xdrive msport - holy hell 4 water pumps for the m damn

Wow I thought it was only a software upgrade well I was wrong no idea they were so different...

Couldn't you solve the rod bearing problem with over filling it with oil.

Basically, don't touch the S55 if you don't have a shit tone of money to spend.

Hopefully there's no waste gate rattle on these like the n54 has...

Fantastic video, thank you.

Fantastic information well done 👍🏼 💯

air to water IC and the UBER cooling system nuff said