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

Welcome to the E46Fanatics forums. E46Fanatics is the premiere website for BMW 3 series owners around the world with interactive forums, a geographical enthusiast directory, photo galleries, and technical information for BMW enthusiasts.

You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!

If you have any problems with the registration process or your account login, please contact contact us.

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 12-09-2012, 01:14 PM   #1
Simon says
Registered User
 
Join Date: Dec 2012
Location: United States
Posts: 5
My Ride: 2003 BMW 325ci
Compression help needed

I am a new member, as well as a new member to owning a Bmw. I recently purchased and 2003 325ci and along with all the cars I come to own I want to deal them with as much care possible to get the most out of it. Is the 120 compression or i believe 9 bar each cylinder normal for my m56 SULEV engine? I believe normal compression is anywhere from 160-180 please correct me if I'm wrong but someone please help!
Simon says is offline   Reply With Quote
Ads by Google

Guests, get your FREE E46Fanatics.com membership to remove this ad.
Old 12-09-2012, 01:28 PM   #2
aikmanson
Registered User
 
Join Date: Nov 2011
Location: Kingston/Cortland NY
Posts: 238
My Ride: 2000 323ci
Quote:
Originally Posted by Simon says View Post
I am a new member, as well as a new member to owning a Bmw. I recently purchased and 2003 325ci and along with all the cars I come to own I want to deal them with as much care possible to get the most out of it. Is the 120 compression or i believe 9 bar each cylinder normal for my m56 SULEV engine? I believe normal compression is anywhere from 160-180 please correct me if I'm wrong but someone please help!
Correct me if I am wrong here, but isnt the SULEV engine only offered in sedan form? Are you sure you have a SULEV engine, and if so, is your car really a 325ci?
__________________
2003 Jeep Wrangler Rubicon
2000 BMW 323ci
1995 Saab 900 SE - JZW Stage 4
aikmanson is offline   Reply With Quote
Old 12-09-2012, 01:39 PM   #3
Simon says
Registered User
 
Join Date: Dec 2012
Location: United States
Posts: 5
My Ride: 2003 BMW 325ci
SULEV comes in 2003-2005 325 sedans, coupes, and sport wagons with automatic transmission only. I just don't know if it changes specifications from the m54 engine. It was confirmed by the dealership I was working with it has a SULEV
Simon says is offline   Reply With Quote
Old 12-09-2012, 04:25 PM   #4
aikmanson
Registered User
 
Join Date: Nov 2011
Location: Kingston/Cortland NY
Posts: 238
My Ride: 2000 323ci
Quote:
Originally Posted by Simon says View Post
SULEV comes in 2003-2005 325 sedans, coupes, and sport wagons with automatic transmission only. I just don't know if it changes specifications from the m54 engine. It was confirmed by the dealership I was working with it has a SULEV
Interesting, good to know.

I did a search on google and here and couldn't find any info on the compression of the SULEV. Found something that mentioned the pistons being different with the SULEV having a slightly lower compression ratio than the M54, but no hard numbers.
__________________
2003 Jeep Wrangler Rubicon
2000 BMW 323ci
1995 Saab 900 SE - JZW Stage 4
aikmanson is offline   Reply With Quote
Old 12-09-2012, 05:43 PM   #5
shovelit
Registered User
 
Join Date: Oct 2012
Location: Pittsburgh PA
Posts: 345
My Ride: 03 325xi and 04 330x
What prompted you to do a compression test?
Are you chasing a problem?
shovelit is offline   Reply With Quote
Old 12-09-2012, 06:20 PM   #6
lcoleman
Registered User
 
Join Date: Mar 2007
Location: the barnyard
Posts: 2,433
My Ride: '79 Massey Ferguson
The exact number doesn't matter. Gauges can be inaccurate, or you might not have cranked it over long enough. It's the consistency between each cylinder that matters.
__________________
lcoleman is offline   Reply With Quote
Old 12-09-2012, 11:04 PM   #7
Simon says
Registered User
 
Join Date: Dec 2012
Location: United States
Posts: 5
My Ride: 2003 BMW 325ci
I'm not chasing a problem, I would just like to see the overall health and potential my at has to offer. I can't find anywhere on the Internet to what specifications may be different
Simon says is offline   Reply With Quote
Old 12-10-2012, 01:36 PM   #8
Hukerfaker
Registered User
 
Join Date: Sep 2010
Location: Croatia
Posts: 314
My Ride: My wife.
9 bars per cilinder should be normal compression on any petrol engine.
__________________
Hukerfaker is offline   Reply With Quote
Old 12-10-2012, 01:40 PM   #9
Hukerfaker
Registered User
 
Join Date: Sep 2010
Location: Croatia
Posts: 314
My Ride: My wife.
Now I see Wikipedia says 10, but I squeezed 200.000 kilometers out of my old car after I measured 9 bars per cilinder, so you should be fine. Just take care for the engine and don't treat it like it's m3
__________________
Hukerfaker is offline   Reply With Quote
Old 12-10-2012, 01:45 PM   #10
WDE46
Registered User
 
Join Date: Sep 2012
Location: Virgo Supercluster
Posts: 8,000
My Ride: 2004 330Ci OBM
The compression ratio is a little over 10:1, so you should see almost 10 bar. The rings and valves all leak a little bit even in perfect cars but not much.
WDE46 is online now   Reply With Quote
Old 12-11-2012, 09:30 AM   #11
Simon says
Registered User
 
Join Date: Dec 2012
Location: United States
Posts: 5
My Ride: 2003 BMW 325ci
Hmm, okay thanks to you all for this information
Simon says 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 02:35 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
(c) 1999 - 2011 performanceIX Inc - privacy policy - terms of use