[RedCarrot]

The M2 Comp thread prompted me to look into the weight difference between the two engines. My search result is that the S55 weighs 205kg while the N55 weighs 132kg. That can’t be right, can it? That’s a 73kg (160 lb) difference!! I know the twin turbo has more turbo hardware and plumbing but still...

Perhaps the S55 figure includes turbo hardware while the N55 figure doesn’t? Does anybody have any insight?

[WAY]

That’s with all cooling and plumbing. Not sure what the N55 figures include that it’s not possible for it to be 132kg with cooling and plumbing!

[quduoheng]

Originally Posted by RedCarrot

The M2 Comp thread prompted me to look into the weight difference between the two engines. My search result is that the S55 weighs 205kg while the N55 weighs 132kg. That can’t be right, can it? That’s a 73kg (160 lb) difference!! I know the twin turbo has more turbo hardware and plumbing but still...

Perhaps the S55 figure includes turbo hardware while the N55 figure doesn’t? Does anybody have any insight?

The s55 on m4 has central cooling on top where the s55 on m2 doesn't. So there is a few dozen pounds.

[Tag]

I believe I read sometime ago the n54 was 195kg. The n55 must be somewhere in that weight range, although I can't find it documented anywhere other than some post which are not official. IMO there's no way it's only 132kg while the s55 is 205kg.

[//M]

Originally Posted by quduoheng

The s55 on m4 has central cooling on top where the s55 on m2 doesn't. So there is a few dozen pounds.

Wait What? Is that a typo or does the S55 in the comp not have a liquid intercooler on the top of the engine.

[Bluenose-2er]

Originally Posted by Tag

I believe I read sometime ago the n54 was 195kg. The n55 must be somewhere in that weight range, although I can't find it documented anywhere other than some post which are not official. IMO there's no way it's only 132kg while the s55 is 205kg.

N54 is twin turbo while N55 is single turbo, so not a good comparison. But I agree the weight differential between N55 and S55 sounds suspect.

[quduoheng]

Originally Posted by tifosielia

Wait What? Is that a typo or does the S55 in the comp not have a liquid intercooler on the top of the engine.

I hope it's a typo.
M2S55 might have been physically down tuned. so less cooling capacity compare to m3/4. Just guessing.

[ChrisK]

Originally Posted by tifosielia

Wait What? Is that a typo or does the S55 in the comp not have a liquid intercooler on the top of the engine.

I would say -> nobody knows.

[ChrisK]

Originally Posted by quduoheng

I hope it's a typo.
M2S55 might have been physically down tuned. so less cooling capacity compare to m3/4. Just guessing.

I'm confused - you were the one that posted "The s55 on m4 has central cooling on top where the s55 on m2 doesn't. So there is a few dozen pounds."

So this is only speculation - correct?

[quduoheng]

Originally Posted by ChrisK

I'm confused - you were the one that posted "The s55 on m4 has central cooling on top where the s55 on m2 doesn't. So there is a few dozen pounds."

So this is only speculation - correct?

What are you confused about?
Yes, we can only speculate there is no cooler on top of the S55 from the picture we see.

M2 comp should have a lighter S55 engine to banlance the car compare to M3/4. And with less cooling capacity to restrict the power, but a bit better than N55.
Everybody will be happy.

[McPurrs]

Maybe they threw a spare and a jack in the trunk to balance it out lol

[ChrisK]

Originally Posted by quduoheng

What are you confused about?
Yes, we can only speculate there is no cooler on top of the S55 from the picture we see.

M2 comp should have a lighter S55 engine to banlance the car compare to M3/4. And with less cooling capacity to restrict the power, but a bit better than N55.
Everybody will be happy.

My mistake - the way I read it, it sounded like you had some inside info.

[allthatisntnow]

The N55 is 190+KG still. Its still a 3.0L inline six that shares 75% of parts with the S55. An extra turbo and plumbing doesn't weigh 70KG. That 135KG figure has to be for a 3/4 cylinder.

[//M]

Originally Posted by ChrisK

My mistake - the way I read it, it sounded like you had some inside info.

Yeah, I was nervous too. I think he's saying there's no hood vent on the comp.

[ORIGIN M.]

Originally Posted by quduoheng

The s55 on m4 has central cooling on top where the s55 on m2 doesn't. So there is a few dozen pounds.

Yep front-mount intercooler on the M2sc with a crappy tune to go with it.

Nailed it.

[SeanWRT]

I don't think BMW would bother make new post turbo intake plumbing for an air to air S55, just to 'physically detune' it.

If you have to think there're physical changes, a pair of smaller turbo make more sense - smaller trim but same frame to fit existing system. Much more effective and less hassle.

[stefan]

It's a conspiracy. Everyone knows the N55 in the M2 is no ordinary N55. They changed just about everything that would be changed on an S motor. They just didn't include the cooling. So what if.... could it be... the new M2 with it's S55 sans-heat exchangers.. is really just an N55 with a different codename?

:O

[SeanWRT]

Originally Posted by stefan

It's a conspiracy. Everyone knows the N55 in the M2 is no ordinary N55. They changed just about everything that would be changed on an S motor. They just didn't include the cooling. So what if.... could it be... the new M2 with it's S55 sans-heat exchangers.. is really just an N55 with a different codename?

:O

It's a good idea, but unfortunately W2A IC makes efficiency, not power. N55 isn't making 410PS crank with W2A.

What's more - A2A cooling isn't holding N55 back. Efficient aftermarket Intercooler is as good if not better than S55 W2A. And you see how B58 struggle with cooling from its less capable W2A.

The only correct engine for M2 in my book would be current N55 block + B58 turbo + S55 fueling and intercool system. To make that happen, two parts need to be slightly revised - exhaust manifold (to fit N55's bigger bore) and charge air pipe (turbo to IC). Other stuff are all existing parts. So you have a proper 400 crank power N55 - not too close to S55 but distinguished from other N55 variants and adorable in its own way. Calling it S56 would be appropriate. Could have done that at the very beginning (early 2015). Wouldn't take a lot of engineering at that moment, but I'm sure BMW won't bother at this point.

You think BMW care now that with S55 M2 is too close in straight to M3/4 you think wrong. F8X days are numbered, we're moving on to G generation. This is what they care - Let's just discontinue N55 and put in next best suitable existing thing (which happen to be S55) so we can legally keep making money from M2, a proven very successful product.

[Gatte]

Originally Posted by stefan

It's a conspiracy. Everyone knows the N55 in the M2 is no ordinary N55. They changed just about everything that would be changed on an S motor. They just didn't include the cooling. So what if.... could it be... the new M2 with it's S55 sans-heat exchangers.. is really just an N55 with a different codename?

:O

I hate to bring the N55 in M2 vs S55 topic and I am sure some of the others who've been with me on that topic a while back will also agree.

There are a few fairly fundamental differences between the N55 and S55:
1, One of them is an open deck and the other is a closed deck.
2, One of them has a twin scroll single turbo and the other has a twin turbo.
3, One of them revs to a higher redline than the other. This higher redline and output is usually what requires better and stronger internals.

The open deck vs closed deck topic was a very big deal, a massive deal in fact which got a lot of people, most of whom had recently purchased an M2 extremely aggravated.

I remember calling my dealership and having them check with the mechanics who were basically told that the engine in the M2 was very similar to what was in the M235i except for a few differences which were listed in a document that they were given by BMW.

There was also this list that was circulating which listed these differences. I can go back and try to find it but I would hate to read through those threads and open up the proverbial can of worms.

[stefan]

Originally Posted by Gatte

I hate to bring the N55 in M2 vs S55 topic and I am sure some of the others who've been with me on that topic a while back will also agree.

There are a few fairly fundamental differences between the N55 and S55:
1, One of them is an open deck and the other is a closed deck.
2, One of them has a twin scroll single turbo and the other has a twin turbo.
3, One of them revs to a higher redline than the other. This higher redline and output is usually what requires better and stronger internals.

The open deck vs closed deck topic was a very big deal, a massive deal in fact which got a lot of people, most of whom had recently purchased an M2 extremely aggravated.

I remember calling my dealership and having them check with the mechanics who were basically told that the engine in the M2 was very similar to what was in the M235i except for a few differences which were listed in a document that they were given by BMW.

There was also this list that was circulating which listed these differences. I can go back and try to find it but I would hate to read through those threads and open up the proverbial can of worms.

I was making a light hearted joke. That said, ill take that technical documentation if you have it.

[Gatte]

Originally Posted by stefan

I was making a light hearted joke. That said, ill take that technical documentation if you have it.

My bad.

I have to dig it up and there were a lot of threads on this so it could take a while unless Artemis has it handy which I am sure he does.

[///cbrash]

205KG does seem like alot for the S55. That being said, the larger intercooler I just placed on my car added about 18 pounds.

Potentially larger oil cooler and all other cooling parts could add some extra poundage on the s55 though.