Difference between N52 and N52K - E46Fanatics E46 BMW Social Directory E46 FAQ 3-Series Discussion Forums BMW Photo Gallery BMW 3-Series Technical Information E46 Fanatics - The Ultimate BMW Resource BMW Vendors General E46 Forum The Tire Rack's Tire Wheel Forum Forced Induction Forum The Off-Topic The E46 BMW Showroom For Sale, For Trade or Wanting to Buy

Go Back   E46Fanatics > E46 BMW > General E46 Forum

General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

Reply
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 01-15-2020, 05:13 PM   #1
dmax
Registered User
 
dmax's Avatar
 
Join Date: Aug 2006
Location: NJ
Posts: 25,587
My Ride: '99 328i 1.569 mu
Year: 99
Model: 328i
Transmission: 5-spd
Difference between N52 and N52K

...and N51 for that matter.

If I can DIY a bit, is there a major difference between the engines...those who know?

I've found some 2006 e90s with 250 hps, which seems to become a little less in the N52K version.

...and with a '09-11 model I'll have a few years' newer car and some extra dodads.

Forgive me for not talking e46. Is that ok here?

Thanks folks!
__________________

To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
See Facebook for upcoming shows...and listen to my podcast!
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.




To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
dmax is offline   Reply With Quote
Old 01-15-2020, 05:37 PM   #2
TerraPhantm
Registered User
 
Join Date: Feb 2008
Location: Philadelphia
Posts: 7,678
My Ride: M3
N52 vs N52K - minor changes:
Different engine management (MSV70 vs MSV80)
Different MAF sensor (analog vs digital)
Different throttle body (uses magnetic sensors instead of whatever was used before)
Different valve cover (aluminum vs plastic)
Stronger connecting rods on the N52K
Larger exhaust valve stems on the N52K (these were actually introduced mid production on the regular N52)
Revised electric water pump (no idea what the difference is)
Lighter cam shafts on the N52K (same specs otherwise).

Power output is the same. You'll see some people saying 255hp vs 26xhp and even some quotes of 272hp. The 255 vs 260 are the same engine with the same tunes. Some chassis had somewhat more efficient exhausts allowing a few horsepower to be squeezed out. The 27x hp quotes are in reference to european spec direct injection models.

In the US, only the X3 and X5 came with the 3-stage manifold version of the N52K. But it is trivial to retrofit this to 128/328/528s.

N52K vs N51
Extra catalytic converter in midpipe
Secondary air pump (N52/N52K didn't have one)
Modified combustion chamber geometry
Lower compression
Stainless steel fuel lines
Radiator with ozone fixing coating
Activated carbon filter for evaporative emissions
Purge system pipes made from "optimized" plastic (whatever that means).
Comes factory with 3-stage intake manifold (and thus cannot be easily tuned to make the full 255hp since it already needs the DISA manifold to make its 230).
__________________

To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
TerraPhantm is online now   Reply With Quote
Old 01-15-2020, 06:11 PM   #3
LeverThis
Registered User
 
Join Date: Jul 2016
Location: SF Bay Area, CA
Posts: 1,366
My Ride: 2004 325i automagic
The N51 sounds like a sulev version, so you probably want to avoid that one. A radiator with ozone fixing coating sounds pricey, not to mention the reduced power output.
__________________

To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
:

20mm OD x 12mm ID x 4mm W : Viton O-Ring
3/4" OD x 1/2"ID x 1/16" Thick : Thrust Bearing/Washer

Last edited by LeverThis; 01-15-2020 at 06:13 PM.
LeverThis is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 01-15-2020, 06:23 PM   #4
dmax
Registered User
 
dmax's Avatar
 
Join Date: Aug 2006
Location: NJ
Posts: 25,587
My Ride: '99 328i 1.569 mu
Year: 99
Model: 328i
Transmission: 5-spd
My bmw vin deconder shows the N52 at 258 hp and the N52K at 234 hp ...I guess I'd like stronger connecting rods, etc, though that might add weight and thus the hp loss (in part)?

I'm also revisiting my decision to stay away from turbos. A CPO car would be worry-free for some years, at least...and 335s are out there...how many with manuals, I don't know.

Am I being old and purist for no reason in my anti-turbo stance? I know more expensive when they go wrong...but also know they want the right oil at the right time. I worry they don't have longevity, though.

Is it time to move on to an f30?
__________________

To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
See Facebook for upcoming shows...and listen to my podcast!
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.




To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
dmax is offline   Reply With Quote
Old 01-15-2020, 06:28 PM   #5
TerraPhantm
Registered User
 
Join Date: Feb 2008
Location: Philadelphia
Posts: 7,678
My Ride: M3
Quote:
Originally Posted by dmax View Post
My bmw vin deconder shows the N52 at 258 hp and the N52K at 234 hp ...I guess I'd like stronger connecting rods, etc, though that might add weight and thus the hp loss (in part)?

I'm also revisiting my decision to stay away from turbos. A CPO car would be worry-free for some years, at least...and 335s are out there...how many with manuals, I don't know.

Am I being old and purist for no reason in my anti-turbo stance? I know more expensive when they go wrong...but also know they want the right oil at the right time. I worry they don't have longevity, though.

Is it time to move on to an f30?
You're looking at 330s vs 328s. The engines were sold in 3 power variants. Low power, Medium Power, and High Power

Low power (e.g 325i) was 215hp
Medium power (e.g 328i) was 230hp
High Power (e.g 330i) was 255hp.

The high power variant has a 3-stage intake manifold. The low and medium power variants do not.

The medium power version only ever existed as an N52K. The low and high power versions were available in both forms, but in the United States only the X3 and X5 3.0si were sold with High Power N52Ks, and only the Canadian X3 3.0i got the low power version of the N52K.

Asides for the intake manifold, the engines were identical. Same cranks, same cams, same pistons, etc.
__________________

To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

Last edited by TerraPhantm; 01-15-2020 at 06:30 PM.
TerraPhantm is online now   Reply With Quote
Old 01-15-2020, 08:44 PM   #6
dmax
Registered User
 
dmax's Avatar
 
Join Date: Aug 2006
Location: NJ
Posts: 25,587
My Ride: '99 328i 1.569 mu
Year: 99
Model: 328i
Transmission: 5-spd
...and thanks so much, Terra! Next time I'm in philly, I owe you a beer!
__________________

To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
See Facebook for upcoming shows...and listen to my podcast!
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.




To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
dmax is offline   Reply With Quote
Old 01-15-2020, 09:49 PM   #7
Megalocnus
Registered User
 
Join Date: Oct 2008
Location: Los Angeles, CA
Posts: 3,741
My Ride: 05 330i ZHP/MT
The early N52 engines have a CCV system similar to the M54 and M52TU engines, except it has a built-in electric heater - hence the parts are way more expensive...
The N52K has a much simpler and better designed valve cover-integrated CCV, like in the M56 engines.

The E90 SULEV BMWs don't have the fuel pump/gas tank issue that pretty much condemns any post-150K mile E46 SULEV car that needs replacing the fuel pump. The tank has service lids and the pump is a separate part.
They still have SULEV-specific parts, i.e. radiator, airbox, catalytic convertors, some of which are substantially more expensive than the non-SULEV counterparts...

Last edited by Megalocnus; 01-15-2020 at 10:10 PM.
Megalocnus is offline   Reply With Quote
Old Yesterday, 03:12 AM   #8
LeverThis
Registered User
 
Join Date: Jul 2016
Location: SF Bay Area, CA
Posts: 1,366
My Ride: 2004 325i automagic
Quote:
Originally Posted by Megalocnus View Post
The early N52 engines have a CCV system similar to the M54 and M52TU engines, except it has a built-in electric heater - hence the parts are way more expensive...
The N52K has a much simpler and better designed valve cover-integrated CCV, like in the M56 engines.
So the early N52 engine is the one that catches fire randomly when the car is off?

Edit1: Nevermind, I think it might be the hvac blower wiring that catches fire in the e90s.

Edit2: Nevermind again ... I see there are multiple e90 fire recalls. One for hvac wiring and the other is for the heater for the pcv ... which means the early n52 perhaps??
__________________

To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
:

20mm OD x 12mm ID x 4mm W : Viton O-Ring
3/4" OD x 1/2"ID x 1/16" Thick : Thrust Bearing/Washer

Last edited by LeverThis; Yesterday at 03:39 AM.
LeverThis is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

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 On
Censor is ON



All times are GMT -5. The time now is 08:19 AM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
(c) 1999 - VerticalScope Inc. All rights reserved.