[PrematureApex]

Closed deck block (odds are it would share the same, if not extremely similar, casting with the S55).

http://www.bmwusa.com/bmw/M/M2/

The M2’s fully aluminum closed-deck block design and grey-cast iron liners allow cylinders to endure higher pressure under the most demanding driving conditions.

[PrematureApex]

I will say, I'm a bit confused over the logic some people use on this forum.

It would be one thing if we had BMW literature stating it was an open deck.

But we don't.

The absence of specificity in some BMW sources is not the same thing as contradictory information.

So far, all of BMW's literature that mentions the block type at all have indicated a closed deck.

Absolutely zero BMW sources have indicated an open deck.

[PeterPure]

Originally Posted by ASAP

This is a lot of talk on something that we have no confirmation on lol... a different part number means next to nothing... for example... BMW has 5 different version / part numbers of N54 spark plugs that it uses that are virtually indistinguishable...

In addition, if this is truly a different turbo, its quite wild that it made the same exact power as a standard N55 on the dyno... even when tuned... lol

I would only believe a wastegate difference as this has changed before... but a maxed turbo is a maxed turbo... if no sizing difference, then no difference at all virtually.

Indeed a different part number does not mean much

[Boss330]

Originally Posted by PrematureApex

I will say, I'm a bit confused over the logic some people use on this forum.

It would be one thing if we had BMW literature stating it was an open deck.

But we don't.

The absence of specificity in some BMW sources is not the same thing as contradictory information.

So far, all of BMW's literature that mentions the block type at all have indicated a closed deck.

Absolutely zero BMW sources have indicated an open deck.

The logic is quite simple: It's a N55 and N55 have open deck blocks... We have BMW litterature stating that the N55 indeed is an open deck block! So by default a N55 is a open deck block unless it specifically is said it's a new block or a closed deck block.

And it's not mentioned in the tech training docs like it was on the S55, which made a point about detailing that, unlike the N55 open deck block, the S55 has a closed deck block.

But, yes it has been written a few places that it has a closed deck. But it's NOT mentioned in the official press release nor in the tech training docs. And a new engine block is quite a big thing... They mention S55 pistons and other bits and pieces. But NOTHING about a larger/different turbo nor new engine block with a closed deck design...

[zenmaster]

Originally Posted by ASAP

This is a lot of talk on something that we have no confirmation on lol... a different part number means next to nothing... for example... BMW has 5 different version / part numbers of N54 spark plugs that it uses that are virtually indistinguishable...

In addition, if this is truly a different turbo, its quite wild that it made the same exact power as a standard N55 on the dyno... even when tuned... lol

I would only believe a wastegate difference as this has changed before... but a maxed turbo is a maxed turbo... if no sizing difference, then no difference at all virtually.

Could be the same turbo internals but different housing, but I doubt it. Every other model using the N55 engine has the exact same turbo part number. That is except for the X4 which has yet another turbo part number. Nah, this thing is simply flowing much more air and it ain't merely due to the less restrictive intake (over the M235i). The EPA figures attests to it.

[Bosozoku]

Originally Posted by Yellowflash21

... They just created such a public confusion by giving N55 name to an M car.

M Division had to work hard to keep the M2 slower than the M3/4.
Didn't want to undercut the perceived value of the bigger-margin cars.

[CaryTheLabelGuy]

I don't understand why BMW would design a different block other than the S55's, that was closed deck, and still call it an N55. Why not just call it an S55B302 (compared to the F8x's S55B30)?

[Boss330]

Originally Posted by CaryTheLabelGuy

I don't understand why BMW would design a different block other than the S55's, that was closed deck, and still call it an N55. Why not just call it an S55B20 (compared to the F8x's S55B30)?

Agreed that if it was a closed deck block it would have made more sense to use the S55 block. And that would have been mentioned in the litterature. But they only mention S55 pistons...

However, calling it a S55B20 would not work with the system BMW has for engine nomenclature. The 30 part denotes displacement in liters and as long as the M2 engine is a 3 liter it has to be a 30 as well.

Examples:

S52B30 - E36 M3 3.0
S52B32 - E36 M3 3.2
S54B32 - E46 M3 3.2
N53B25 - multiple models 2.5 liter
N53B30 - multiple models 3.0 liter
S38B36 - E34 M5 3.6
S38B38 - E34 M5 3.8
S63B44 - F10 M5 4.4
S65B40 - E9x M3 4.0
S65B44 - E92 M3 GTS 4.4

[CaryTheLabelGuy]

Originally Posted by Boss330

Agreed that if it was a closed deck block it would have made more sense to use the S55 block. And that would have been mentioned in the litterature. But they only mention S55 pistons...

However, calling it a S55B20 would not work with the system BMW has for engine nomenclature. The 30 part denotes displacement in liters and as long as the M2 engine is a 3 liter it has to be a 30 as well.

Examples:

S52B30 - E36 M3 3.0
S52B32 - E36 M3 3.2
S54B32 - E46 M3 3.2
N53B25 - multiple models 2.5 liter
N53B30 - multiple models 3.0 liter
S38B36 - E34 M5 3.6
S38B38 - E34 M5 3.8
S63B44 - F10 M5 4.4
S65B40 - E9x M3 4.0
S65B44 - E92 M3 GTS 4.4

That was a typo. I fixed it.

[hellrotm]

Originally Posted by Boss330

However, calling it a S55B20 would not work with the system BMW has for engine nomenclature. The 30 part denotes displacement in liters and as long as the M2 engine is a 3 liter it has to be a 30 as well.

Originally Posted by CaryTheLabelGuy

I don't understand why BMW would design a different block other than the S55's, that was closed deck, and still call it an N55. Why not just call it an S55B302 (compared to the F8x's S55B30)?

On another forum had contacted BMW. They got these responses, interesting part being no more "S" denotations.

The engine of the BMW M2 coupe is a genuine M engine that was developed in the Engine Development Department at M GmbH in Munich's Preußenstraße. Performance-related components from the BMW M4 engine have been adopted for the BMW M2 coupe.

On why the N55B30T0 doesn't have an "S" denotation.

We are moving away from the traditional "S" designation that has solely used for BMW M engines.

[OrangeCrush]

Originally Posted by BlackJetE90

On another forum they connected BMW. They got these responses, interesting part being no more "S" denotations.



On why the N55B30T0 doesn't have an "S" denotation.

Oh no, I bet Sticky is having a field day with the going away from 's engines thing.

[raysspl]

Not surprised 1 bit to hear about this

[PrematureApex]

Originally Posted by Boss330

The logic is quite simple: It's a N55 and N55 have open deck blocks... We have BMW litterature stating that the N55 indeed is an open deck block! So by default a N55 is a open deck block unless it specifically is said it's a new block or a closed deck block.

And it's not mentioned in the tech training docs like it was on the S55, which made a point about detailing that, unlike the N55 open deck block, the S55 has a closed deck block.

But, yes it has been written a few places that it has a closed deck. But it's NOT mentioned in the official press release nor in the tech training docs. And a new engine block is quite a big thing... They mention S55 pistons and other bits and pieces. But NOTHING about a larger/different turbo nor new engine block with a closed deck design...

It's a new block. Don't know how many places you need to read that in order to consider it established.

[greekcs]

need confirmation of new block. must remove head and take photos. jk

[neckthrough]

Originally Posted by Boss330

But, yes it has been written a few places that it has a closed deck. But it's NOT mentioned in the official press release nor in the tech training docs. And a new engine block is quite a big thing... They mention S55 pistons and other bits and pieces. But NOTHING about a larger/different turbo nor new engine block with a closed deck design...

Uh... BMW USA's main M2 page advertises "CLOSED-DECK BLOCK" in big bold letters as 1 of the 3 main selling points of the Engine/Performance section. The text in that section further reads "The M2’s fully aluminum closed-deck block design and grey-cast iron liners allow cylinders to endure higher pressure under the most demanding driving conditions."

http://www.bmwusa.com/bmw/M/M2/

So are you implying that there's a major faux-pas on the part of the website designer? Again, this is not a small detail in a big section of text. This is a major advertising point for the engine.

[///M Guy]

Originally Posted by swagon

M2 is now in the BMW ETK...

M2: 11 65 8 053 153

M235i (there are two part numbers): 11 65 7 648 913; 11 65 7 643 115

X4 M40i: 11 65 8 663 045

Attachment 1400021

The pics are identical for all cars.

Thanks for sharing!

[ASAP]

Originally Posted by neckthrough

Uh... BMW USA's main M2 page advertises "CLOSED-DECK BLOCK" in big bold letters as 1 of the 3 main selling points of the Engine/Performance section. The text in that section further reads "The M2’s fully aluminum closed-deck block design and grey-cast iron liners allow cylinders to endure higher pressure under the most demanding driving conditions."

http://www.bmwusa.com/bmw/M/M2/

So are you implying that there's a major faux-pas on the part of the website designer? Again, this is not a small detail in a big section of text. This is a major advertising point for the engine.

It does indeed... which is weird as no other N55 is closed deck... but a closed deck to me implies a major engine difference, as in this isn't an N55... but why then is it still called an N55?

[ASAP]

Originally Posted by CaryTheLabelGuy

I don't understand why BMW would design a different block other than the S55's, that was closed deck, and still call it an N55. Why not just call it an S55B302 (compared to the F8x's S55B30)?

Again... dead on... I think something is not right here...

[zenmaster]

Maybe BMW DIDN'T design it!

[burrito007]

In on first real M2 vs. M4 fanboy dispute thread.

[bimmerjph]

Originally Posted by ROBNYC

Yes because the M2 has overboost feature of 370lb torque, so in essence the X4 M40i engine is a detuned M2 (355hp/343).

Overboost could be done via a software. Doesn't necessarily require a hardware change.

[M3 Adjuster]

Originally Posted by zenmaster

Now we know for sure the M2 is not using the standard N55 turbo.

Whatev. I knew months ago. So much doubt that the M engineers will come thru and they always do...