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BMW M2 Forum > BMW M2 Discussions > Base M2 N55 deck layout (closed/open): BMW F87 M2 press releases 10/2015 vs. 02/2016

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      02-08-2017, 02:37 PM   #23
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Quote:
Originally Posted by GimmeanM View Post
I'm pretty sure the N55 in the M2 is an open deck. :
Let's look at the bright side of things: also open deck can bring joy.

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      02-12-2017, 02:42 AM   #24
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      02-12-2017, 05:06 AM   #25
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Isn't the tyre reference just because over this next life cycle year MPSS is replaced by Michelin themselves to a PS4 or something.
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      02-12-2017, 09:36 AM   #26
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Quote:
Originally Posted by rouxeny
Seems like a big vote for the "open deck" camp!

Not that 80% of our readers (me included) can actually describe what that means.
Not a BMW engine but a clear explanation:

http://www.enginelabs.com/news/suppo...r-closed-deck/
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      02-12-2017, 11:41 AM   #27
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Quote:
Originally Posted by Corinne View Post
Quote:
Originally Posted by Artemis View Post
Example of open deck:
Attachment 1533253

Example of closed deck:
Attachment 1533255
Ah ! Thanks Artemis... now it's clear. The closed deck has that extra thingy on the left !
a crankshaft thingy... lol
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      02-12-2017, 12:26 PM   #28
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Quote:
Originally Posted by crqflier View Post
Quote:
Originally Posted by rouxeny
Seems like a big vote for the "open deck" camp!

Not that 80% of our readers (me included) can actually describe what that means.
Not a BMW engine but a clear explanation:

http://www.enginelabs.com/news/suppo...r-closed-deck/
Thanks for this excellent article describing the difference between open and closed deck designs.
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      02-12-2017, 03:20 PM   #29
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Quote:
Originally Posted by crqflier View Post
Not a BMW engine but a clear explanation:
http://www.enginelabs.com/news/suppo...r-closed-deck/


I also posted that informative video in the past (in a time when I hadn't noticed yet that the 'closed deck' claim was questionable):
http://f30.bimmerpost.com/forums/sho...2#post19388892
http://f87.bimmerpost.com/forums/sho...5#post19770695
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      02-13-2017, 04:25 PM   #30
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Have no clue, but why would it matter? As long as the engine operates fine.
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      02-13-2017, 04:27 PM   #31
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Not sure why we think this is solved.
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      02-13-2017, 05:16 PM   #32
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Quote:
Originally Posted by zenmaster View Post
Not sure why we think this is solved.

Because the manufacturer has withdrawn all references to a closed deck for the N55 and it appears that the controversy began because the marketing materials were printed with incorrect info.

The marketing materials have been updated and BMW has retracted all references about the N55 being a closed deck design therefore clearly It is an open deck design.

The S55 in contrast is closed deck, as have been the majority of M motors in the past.
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      02-13-2017, 05:30 PM   #33
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Quote:
Originally Posted by SeanWRT View Post
Let's donate to have that evil opened up. So everybody file a law suit agaist the lying company asking a S55 replacement for compensation.
Why so you guys can have your exhaust note sound like shit too? mine does
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      02-13-2017, 05:31 PM   #34
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Understood. I will ask BMW for their official stance.
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      02-13-2017, 05:32 PM   #35
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Quote:
Originally Posted by crqflier View Post
Quote:
Originally Posted by rouxeny
Seems like a big vote for the "open deck" camp!

Not that 80% of our readers (me included) can actually describe what that means.
Not a BMW engine but a clear explanation:

http://www.enginelabs.com/news/suppo...r-closed-deck/
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      02-13-2017, 05:39 PM   #36
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BMW Group email response excerpt from 10/11/16:
Quote:
Happy to help and have your business.

The starting point for the engine design was the N55. However, the engine has been heavily modified and carries a different suffix designation to the N55 in the M235i. The heavy modification include changes to the engine block, rotating assembly, and forced induction system.

The N55 in the BMW M2 and BMW X4 M40i xDrive are indeed closed deck. The head gasket is the same as it didn’t require any adaptations even if it is now a closed deck design.

Should you have any other question I am sure our team at Customer Relations will be happy to assist.

Best regards,

------------------------------------------------------------

BMW Group

Hector Arellano-Belloc

BMW Product & Technology Spokesperson
AK-1-AM-US
300 Chestnut Ridge Rd.
Woodcliff Lake, NJ 07677
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      02-13-2017, 05:42 PM   #37
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Quote:
Originally Posted by zenmaster View Post
BMW Group email response excerpt from 10/11/16:
So this guy was either clueless or a lying sack. Something tells me he would not risk the latter option. So if it's not a closed deck, then he was clueless.

Still surprised nobody has had the head off one of these things, for some sort of radical build or something...
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      02-13-2017, 05:44 PM   #38
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Quote:
Originally Posted by M3 Adjuster View Post
Because the manufacturer has withdrawn all references to a closed deck for the N55 and it appears that the controversy began because the marketing materials were printed with incorrect info.

The marketing materials have been updated and BMW has retracted all references about the N55 being a closed deck design therefore clearly It is an open deck design.

The S55 in contrast is closed deck, as have been the majority of M motors in the past.
There seems to be an unwarranted leap in your conclusion. There is also the possibility that the marketing people realized that 95% (maybe higher) of those reading the material had no clue what "closed deck" means and decided to take it out for clear language reasons. The marketing people I have worked with in years gone by hated it when I tossed jargon into my suggested text.

So removal of such text from marketing material is a red herring.
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      02-13-2017, 05:45 PM   #39
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Quote:
Originally Posted by Bluenose-2er View Post
Quote:
Originally Posted by M3 Adjuster View Post
Because the manufacturer has withdrawn all references to a closed deck for the N55 and it appears that the controversy began because the marketing materials were printed with incorrect info.

The marketing materials have been updated and BMW has retracted all references about the N55 being a closed deck design therefore clearly It is an open deck design.

The S55 in contrast is closed deck, as have been the majority of M motors in the past.
There seems to be an unwarranted leap in your conclusion. There is also the possibility that the marketing people realized that 95% (Maybe higher) of those reading the material had no clue what "closed deck" means and decided to take it out for clear language reasons. The marketing people I have worked with in years gone by hated it when I tossed jargon into my suggested text.

So removal of such text from marketing material is a red herring.
A Potential red herring ..
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      02-13-2017, 05:52 PM   #40
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Quote:
Originally Posted by BruceM View Post
So this guy was either clueless or a lying sack. Something tells me he would not risk the latter option. So if it's not a closed deck, then he was clueless.

Still surprised nobody has had the head off one of these things, for some sort of radical build or something...
He's an engineer that teaches tech classes for BMW in addition to contributing to press releases. His name is on the USA press release from a year prior.

What he was responding to:

Quote:
.... I have some questions regarding the 2016/17 BMW M2's and X4 M40i engine (N55B30T0) design.

We know that the standard N55 engine block is an "open deck" design. However, some BMW marketing materials such as BMW USA and BMW UK state that the M2's engine has a "closed deck block". "The lightweight, thermodynamically optimised, all-aluminium unit is very rigid due to its closed-deck design - which means that the cylinder water jacket is closed at the top."

Can you please help me verify that the engine in fact features a closed deck design or if this is a mistake in the marketing materials. This feature is called into question due to the following:

1) The latest BMW marketing material for most other regions (i.e. Germany, France, Spain, Italy) have omitted mention of this important design feature for some reason.

2) If the engine deck is closed, why does it use the same head gasket (same OEM part no) as the standard N55 engine?

Also, since the engine is based on the standard open-deck N55, how was the deck closed in the manufacturing process? i.e. were inserts used or was an enitrely different block casting used?

Thank you!

Sincerely,...
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      02-13-2017, 06:01 PM   #41
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Quote:
Originally Posted by zenmaster View Post
He's an engineer that teaches tech classes for BMW in addition to contributing to press releases. His name is on the USA press release from a year prior.

What he was responding to:
Ah, so he wasn't just some marketing spokesman.

Well, then, it is difficult to conclude definitively anything about the design of the block from these latest data, IMO. The omission of the closed-deck language in more recent materials could mean everything, or nothing...
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      02-13-2017, 06:03 PM   #42
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More marketing trickery by BMW.
I'm quite saddened that BMW has come to resort to these tactics as of late.
Let's exaggerate the facts while the hype is strong and then, by the time buyers figure it out, the hype train would've already taken off.

Remember when all the initial data at the time of the F8X announcement claimed that the S55 was an "over-square" design with a different displacement than the N55? "Oh yes the S55 must be bespoke!"
Well it was proven to be false down the line. In fact not only was the displacement (bore x stroke) and compression ratio identical to the N55, "75% of the engine components were adopted from the N55 production engine."


I gotta say, I was involved with much debate with some members on the M2 discussion boards who swore on their soul that the N55B30T0 (in the F87) had the same block as the S55 because the phrase "closed-deck" in all the BMW propaganda.
It should come as no surprise that N55B30T0 is not a closed-deck.
The name of the engine itself implies that it is a variant (i.e., Technical Update) of the N55B30O0, not a "detuned S55" as many initially alleged it to be.
I tried to dispel the conspiracy theory to no avail that was widespread at the time, the belief that the F87's N55B30T0 was actually a [detuned] variant of the S55 but was not given the "S" code because it would cannibalize sales from the F8x.
One year later, nothing from BMW's technical drawings/literature or any aftermarket shops/tuners were able to supply evidence of a closed-deck in the M2.
And then the phrase slowly gets washed away in marketing literature as well.

Shameful a tactic as it is, BMW marketing was successful. Most people believed it initially and for those who bought the cars already, the newfound truth is unlikely to make them ditch their cars.
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      02-13-2017, 06:09 PM   #43
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So if the tech is saying the m40i is a closed deck wouldn't that also mean the B58 new engine would be closed deck too? According to this BMW tech?
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      02-13-2017, 06:28 PM   #44
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Sounds like they've employed Winston Smith as their records department writer for the bmw ministry of truth.
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