Difference between M52 and M54 Engine - BMW Forum - BimmerWerkz.com

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post #1 of 10 (permalink) Old 09-30-2005, 03:59 PM Thread Starter
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Difference between M52 and M54 Engine

I recently came accross a BMW 323ci and the owner says that the car is of the year 2002.

As far as I know, BMW's up to 2000 where built with the M52 engine and from 2000-Recent with the M54. Am I correct?

Also the 323ci line was until 2000 or not?

What are the differences of the M52 and M54 engines? I searched around but couldn't find anything.

Thanks again for any help guys
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post #2 of 10 (permalink) Old 09-30-2005, 04:39 PM
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Quote:
Originally Posted by Paraklas
I recently came accross a BMW 323ci and the owner says that the car is of the year 2002.

As far as I know, BMW's up to 2000 where built with the M52 engine and from 2000-Recent with the M54. Am I correct?

Also the 323ci line was until 2000 or not?

What are the differences of the M52 and M54 engines? I searched around but couldn't find anything.

Thanks again for any help guys
Yes, you right! Regarding differences-not much, some tech. updates and little more horse powers
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post #3 of 10 (permalink) Old 10-02-2005, 01:21 AM
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M54s are aluminim blocks, m52s aren't. You get more hp, and better anti-knock algorithms. There may be some other things, but this is what I can thinki about off the top of my head.

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post #4 of 10 (permalink) Old 10-02-2005, 05:01 AM Thread Starter
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This is quite interesting.. http://www.bmwworld.com/engines/m54.htm
Also this which makes me think twice if the 323 has the M52: http://www.bmwworld.com/engines/nikasil.htm
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post #5 of 10 (permalink) Old 10-02-2005, 05:50 PM
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Quote:
Originally Posted by Paraklas
This is quite interesting.. http://www.bmwworld.com/engines/m54.htm
Also this which makes me think twice if the 323 has the M52: http://www.bmwworld.com/engines/nikasil.htm
323i/ci 1999 and 2000 E46 have M52TU(technically updated) engines.
M52 engines were installed on E36 cars !
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post #6 of 10 (permalink) Old 10-02-2005, 07:08 PM Thread Starter
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Nice!!!!!!!! Didn't notice that TU in the end.. Thanks!! This minimizes the difference between the M54 and will hopefully make my decision easier

Now why did they stop producing the 323?
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post #7 of 10 (permalink) Old 10-02-2005, 08:11 PM
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^^ The 323 was just rebadged 325 when the m54 engines were introduced

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post #8 of 10 (permalink) Old 10-03-2005, 04:23 PM Thread Starter
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Saw the car today... It's a year 2000 European 323ci 2494cc with an M54 engine in flawless condition.

Thanks guys for all the info!!
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post #9 of 10 (permalink) Old 10-04-2005, 02:06 PM Thread Starter
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Grrr it has the Steptronic gearbox and I wanted a manual one... How bad can it be?
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post #10 of 10 (permalink) Old 09-18-2015, 02:07 AM
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M 54 - one problem
he DISA valve, otherwise known as the ęIntake Manifold Adjuster UnitĽ, is located on the side of the intake manifold and is a common failure on the M54 and M52TU BMW engines. The failure is caused by the type of materials used in the manufacture of two of the three key valve components. The three key components of the DISA are the flat plastic flapper valve which opens and closes depending on engine rpm and throttle position, the bell crank lever that rotates it, and the vacuum pot that actuates the bell crank lever. The flapper valve is made of 30% glass reinforced nylon and the bell crank lever is made of standard 6/6 nylon. As shown in the pictures on the left, the bell crank lever has a male, hex shaped protrusion, which snaps into a matching female pocket on the flapper valve. These hex shaped sections are what allow the rotation of the bell crank lever to rotate the flapper valve.

During normal engine operation, vibrations from pressure pulses inside the intake manifold cause the bell crank lever and flapper valve to vibrate against each other where the hex shaped portions contact each other. These vibrations start a wear process which will cause the tiny glass fibers in the flapper valve to become exposed. Once the fibers become exposed they start to erode away the male hex portion of the weaker bell crank lever. As soon as the erosion starts itís all down hill from there until the hex is completely worn away. The symptoms of a worn DISA valve include rough idle, lean engine codes and lack of low to mid rpm power.
If you disassemble a worn out DISA valve and look at the bell crank lever itís common to not even recognize that it once had a hex shape on the protrusion. Once the hex is shape is worn off the lever, the flapper valve no longer opens and closes in a controlled manner by the rotation of the bell crank lever. The brittle flapper valve becomes free to slap around uncontrolled within the DISA support framework. This uncontrolled movement can lead to complete destruction of the flapper valve. The broken pieces of valve have no where else to go except through the intake manifold runners and through the motor, sometimes resulting in severe engine damage. Even a small piece of plastic broken off the flapper valve can hold an intake valve open, resulting in bent valves or much worse.

Since the only parts on the DISA valve that typically fail are the flapper valve, bell crank lever and housing seal, why replace the entire unit. Replace the failed internal parts with these upgraded parts and have a much more reliable DISA for 1/3 the cost.
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