E90Post
 


N54Tuning.com
 
BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > N52B25 vs N52B30



Reply
 
Thread Tools Search this Thread
      09-02-2013, 11:23 AM   #1
jokers_greg
Master of Montego Blue
jokers_greg's Avatar
Canada
14
Rep
318
Posts

Drives: 2008 BMW 323i
Join Date: Jan 2012
Location: Canada

iTrader: (4)

Garage List
2007 335i  [0.00]
N52B25 vs N52B30

Got a quick question regarding the two. Are they the same block/head size just the cylinders are bored out a bit to go from 2.5 to 3.0L?

I'm curious if the cylinder walls in the 3L are just thinner, or if the engine is physically larger as well?
Appreciate 0
      09-02-2013, 03:04 PM   #2
mike-y
just another bmw douche bag
United_States
165
Rep
3,669
Posts

Drives: 1.9L of fury
Join Date: Nov 2008
Location: Los Angeles, CA

iTrader: (4)

the 2.5 has both a smaller bore and a smaller stroke than the nb30. Otherwise the actual blocks and heads are the same. Just different bore size and rotating assembly.

82mm bore x 78mm stroke vs. 85mm bore x 88mm stroke.
Appreciate 1
      09-02-2013, 05:21 PM   #3
jokers_greg
Master of Montego Blue
jokers_greg's Avatar
Canada
14
Rep
318
Posts

Drives: 2008 BMW 323i
Join Date: Jan 2012
Location: Canada

iTrader: (4)

Garage List
2007 335i  [0.00]
Quote:
Originally Posted by mike-y View Post
the 2.5 has both a smaller bore and a smaller stroke than the nb30. Otherwise the actual blocks and heads are the same. Just different bore size and rotating assembly.

82mm bore x 78mm stroke vs. 85mm bore x 88mm stroke.
Right, so the outer dimensions are still the same. However with a larger bore, the cylinder walls would be thinner
Appreciate 0
      09-07-2013, 08:35 PM   #4
Wrngway
Lieutenant
Wrngway's Avatar
14
Rep
426
Posts

Drives: '11 328i Sedan A6
Join Date: Jul 2011
Location: D.C. Metro

iTrader: (1)

Here's an N52 article I found. I suspect your answer and any other info you need may be here. If not, it's a good read.
Attached Images
File Type: pdf N52 Article.pdf (4.85 MB, 3157 views)
Appreciate 0
      09-10-2013, 05:41 PM   #5
jokers_greg
Master of Montego Blue
jokers_greg's Avatar
Canada
14
Rep
318
Posts

Drives: 2008 BMW 323i
Join Date: Jan 2012
Location: Canada

iTrader: (4)

Garage List
2007 335i  [0.00]
Quote:
Originally Posted by Wrngway View Post
Here's an N52 article I found. I suspect your answer and any other info you need may be here. If not, it's a good read.
Awesome article, thanks!
Appreciate 0
      09-10-2013, 11:53 PM   #6
nate5ks
Captain
United_States
27
Rep
649
Posts

Drives: 2006 BMW 330xi
Join Date: Nov 2011
Location: Jacksonville Beach, FL

iTrader: (0)

Quote:
Originally Posted by Wrngway
Here's an N52 article I found. I suspect your answer and any other info you need may be here. If not, it's a good read.
Where?
Appreciate 0
      09-11-2013, 02:14 AM   #7
mapleridge
Banned
108
Rep
2,681
Posts

Drives: E90 N52 AT
Join Date: Apr 2011
Location: Vancouver, BC

iTrader: (4)

excellent read. thanks.
Appreciate 0
      09-11-2013, 07:10 PM   #8
Wrngway
Lieutenant
Wrngway's Avatar
14
Rep
426
Posts

Drives: '11 328i Sedan A6
Join Date: Jul 2011
Location: D.C. Metro

iTrader: (1)

Quote:
Originally Posted by nate5ks View Post
Where?
It's an attached pdf file. If you're browsing on your phone you might not be able to see it.
Appreciate 0
      05-05-2018, 09:59 AM   #9
BMW525I
Registered
0
Rep
1
Posts

Drives: BMW 525i E28
Join Date: May 2018
Location: Quito, Ecuador

iTrader: (0)

Dear E90 Forum.

I am looking for an E90 BMW 325i. I am in doubt though about exactly how know whether the engine is an N52b25 (Which I want) or an n52b30. I used to think that all b30īs had Silver Engine Covers and all b25īs had Black Engine Coverīs, but I have found a 325i from 2012, which has a Black engine cover, but the owner says, that it is a b30, so how do I know for certain that it is a b25 and NOT a b30??? Supposedly the b25 was only used until 2011, whereafter a b30 was used, even though it was still called 325i and had the same output (218 hp), but are there a feature or an engine code, that I can check for, so that i know for sure, that it is a b25? Did the b25 in latinamerica, where I live, continue beyond 2011, where the european versions had already changed from a b25 to a b30 in 2011, but that for instance a 325i in latinamaerica, were still the b25 in 2012, since sometimes in South America nad South Africa, the models tends to keep being produced for longer periods in these regions of the world. I live in Ecuador myself.

Thanks in Advance.

Sincerely Thomas.
Appreciate 0
      05-05-2018, 10:48 AM   #10
W37V
[Oo=||=oO]
No_Country
564
Rep
1,636
Posts

Drives: Car
Join Date: Aug 2014
Location: Location

iTrader: (0)

Quote:
Originally Posted by BMW525I View Post
Dear E90 Forum.

I am looking for an E90 BMW 325i. I am in doubt though about exactly how know whether the engine is an N52b25 (Which I want) or an n52b30. I used to think that all b30īs had Silver Engine Covers and all b25īs had Black Engine Coverīs, but I have found a 325i from 2012, which has a Black engine cover, but the owner says, that it is a b30, so how do I know for certain that it is a b25 and NOT a b30??? Supposedly the b25 was only used until 2011, whereafter a b30 was used, even though it was still called 325i and had the same output (218 hp), but are there a feature or an engine code, that I can check for, so that i know for sure, that it is a b25? Did the b25 in latinamerica, where I live, continue beyond 2011, where the european versions had already changed from a b25 to a b30 in 2011, but that for instance a 325i in latinamaerica, were still the b25 in 2012, since sometimes in South America nad South Africa, the models tends to keep being produced for longer periods in these regions of the world. I live in Ecuador myself.

Thanks in Advance.

Sincerely Thomas.
Type in last 7 of the vin into this website http://bimmer.work or any other bmw vin websites and it will list what engine the car has.
Appreciate 0
      05-05-2018, 06:27 PM   #11
Zajac1
Major
Zajac1's Avatar
Poland
150
Rep
1,292
Posts

Drives: 2011 E91 328i MT
Join Date: May 2011
Location: New Jersey

iTrader: (1)

Quote:
Originally Posted by BMW525I View Post
Dear E90 Forum.

I am looking for an E90 BMW 325i. I am in doubt though about exactly how know whether the engine is an N52b25 (Which I want) or an n52b30. I used to think that all b30īs had Silver Engine Covers and all b25īs had Black Engine Coverīs, but I have found a 325i from 2012, which has a Black engine cover, but the owner says, that it is a b30, so how do I know for certain that it is a b25 and NOT a b30??? Supposedly the b25 was only used until 2011, whereafter a b30 was used, even though it was still called 325i and had the same output (218 hp), but are there a feature or an engine code, that I can check for, so that i know for sure, that it is a b25? Did the b25 in latinamerica, where I live, continue beyond 2011, where the european versions had already changed from a b25 to a b30 in 2011, but that for instance a 325i in latinamaerica, were still the b25 in 2012, since sometimes in South America nad South Africa, the models tends to keep being produced for longer periods in these regions of the world. I live in Ecuador myself.

Thanks in Advance.

Sincerely Thomas.
realoem.com
Appreciate 0
      05-05-2018, 06:50 PM   #12
PhaseP
Major
357
Rep
1,375
Posts

Drives: 325XI
Join Date: May 2010
Location: Earth

iTrader: (0)

The vin should tell. Also there are three labels on the engine block that tells its model. One is in front of it, a small white sticker, it may have fallen off though. A picture from my N52B30 325, the sticker is barely hanging on, but says N52B30A of some sort at the 2nd line:
Name:  IMG_1685.JPG
Views: 411
Size:  234.9 KB

The other is on the side under the manifold, can be seen in between the manifold runners with a light. It is hard to read but it does say N52B30A
Name:  IMG_1686.JPG
Views: 412
Size:  208.1 KB

The last one I am aware of, is a barcode that is on the side wall of the flange at the back of the engine where transmission bell house bolts to. On the exhaust side of the engine. I could only see it from engine bay with an inspection mirror on a stick and shining light on it. Here is my picture of it, it is not readable because couldn't camera focus on the mirror, but you can make out that there is a barcode and some text written there on the round mirror. Part of the text says "3.0" as engine volume, which tells it is B30.

Name:  IMG_1690.JPG
Views: 411
Size:  188.7 KB

You can search for pictures of the N52 blocks online and can find more of these for reference use.
Appreciate 0
      05-05-2018, 07:13 PM   #13
PhaseP
Major
357
Rep
1,375
Posts

Drives: 325XI
Join Date: May 2010
Location: Earth

iTrader: (0)

Quote:
Originally Posted by mike-y View Post
the 2.5 has both a smaller bore and a smaller stroke than the nb30. Otherwise the actual blocks and heads are the same. Just different bore size and rotating assembly.

82mm bore x 78mm stroke vs. 85mm bore x 88mm stroke.
They have different block and head part numbers.
Appreciate 0
      05-17-2018, 03:46 PM   #14
johnmyster
Private
32
Rep
50
Posts

Drives: 2011 e92 n52
Join Date: May 2017
Location: Virginia

iTrader: (6)

I know that the intake maifolds bolt up the same (so cylinder to cylinder spacing is the same) but the ports in the head of the 2.5 are smaller...so the head would be unique atleast in that manner.

I suspect the combustion chamber would be smaller as well, either by piston or head changes, or both. Then the head would also be different to match the smaller bore.

The engine has the same external footprint, but significant changes within.

Quote:
Originally Posted by mike-y View Post
the 2.5 has both a smaller bore and a smaller stroke than the nb30. Otherwise the actual blocks and heads are the same. Just different bore size and rotating assembly.

82mm bore x 78mm stroke vs. 85mm bore x 88mm stroke.
Appreciate 0
      05-17-2018, 06:50 PM   #15
hassmaschine
Brigadier General
United_States
1908
Rep
4,632
Posts

Drives: "NBO" 330i
Join Date: Jun 2014
Location: earth

iTrader: (0)

The ports on the head are smaller too.
Appreciate 0
Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


All times are GMT -4. The time now is 06:44 AM.




e90post
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST