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General E46 Forum
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Old 12-26-2012, 04:38 PM   #1
metlic53
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325i engine with 330i engine?

as some of you know i have a cracked head and i don't know how the previous owner drove it so its probably not a good idea to just get a new head cause i don't know the shape of the aluminum block.
Will the 3.0 out of a 330i bolt straight into my 2001 325i? what years are compatible with this swap? any advice?
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Old 12-26-2012, 04:54 PM   #2
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I heard is same wires sensor swap by itself is same but you will need to change some modules and reprograming then!
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Old 12-26-2012, 05:03 PM   #3
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I'm pretty sure your 2001 E46 325i came with a M52TUB25 motor and the 330i came with a M54B30 motor. Therefore its not a straight swap... I had the opposite issue in which OI spun a bearing in the lower block of my M52TUB25 motor so I used my M52TB25 head unit and paired it with a M54B30 block. In other words I used my original 323i head unit and a 330i block, crankshaft and injectors to put my car back on the road. Main issues are the 330i motor is drive-by-wire and I believe the 325i motor has a cable throttle body. Secondly the MAF is larger as are the intake hoses and the DME software is different. Those are just a few of the issues you will have to overcome in order to do a straight swap.
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Old 12-26-2012, 06:05 PM   #4
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I'm pretty sure your 2001 E46 325i came with a M52TUB25 motor and the 330i came with a M54B30 motor. Therefore its not a straight swap...
1999-2000 323/328 M52TU line of engines
2001+ 325/330 M54 line of engines (some M56)

2001 325 is a 2.5L M54
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Old 12-27-2012, 10:16 AM   #5
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well i'm going to start looking for an engine then. Whats the latest year i could get and it be a direct swap? is there a certain year that was "better" than the other? i'm hoping to find one with 90k miles or lower, i found one already with 90k and they wanted 2 grand for it (not too bad)
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Old 12-27-2012, 10:22 AM   #6
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well i'm going to start looking for an engine then. Whats the latest year i could get and it be a direct swap? is there a certain year that was "better" than the other? i'm hoping to find one with 90k miles or lower, i found one already with 90k and they wanted 2 grand for it (not too bad)
If I were you, i'd go for 03+. they seem to be mostly free of oil consumption problems for some reason
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Old 12-27-2012, 04:28 PM   #7
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If I were you, i'd go for 03+. they seem to be mostly free of oil consumption problems for some reason
i found one out of a 03 z4 with 66k miles for 2500 with 90 day warranty
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Old 12-27-2012, 10:39 AM   #8
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1999-2000 323/328 M52TU line of engines
2001+ 325/330 M54 line of engines (some M56)

2001 325 is a 2.5L M54
Thanks Alex, appreciate the right information, you da man; the fact that it is still a 2.5L confused me I assumed incorrectly thatr the M54 only came as a 3.0L motor.
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Old 12-26-2012, 05:06 PM   #9
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325i was equipped with an M54B25. Its a direct swap all that is needed is some coding of the MS43 DME.

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Old 12-26-2012, 05:29 PM   #10
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More or less a direct swap. Best to grab the intake from the 330. Plugging all that in and installing a 330 tune on your DME should do the trick
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Old 12-26-2012, 05:59 PM   #11
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yup direct swap.
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Old 12-27-2012, 10:17 AM   #12
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Old 12-27-2012, 01:14 PM   #13
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Would it be reasonable to assume the M54 out of a 5 series would be suitable also. I assume some of the periperal plastic will not fit. Is it possible to do "some coding" or a "330 tune" with INPA etc. maybe by changing the VO? Or does this mean replacing the DME?
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Old 12-27-2012, 01:16 PM   #14
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Would it be reasonable to assume the M54 out of a 5 series would be suitable also. I assume some of the periperal plastic will not fit. Is it possible to do "some coding" or a "330 tune" with INPA etc. maybe by changing the VO? Or does this mean replacing the DME?
3, 5, X3, X5, Z4, 04' E60 530, doesn't matter
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Old 12-27-2012, 01:23 PM   #15
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3, 5, X3, X5, Z4, 04' E60 530, doesn't matter
Oil pans are different between chassis, but the block and head are the same.

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Old 12-27-2012, 01:27 PM   #16
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Oil pans are different between chassis, but the block and head are the same.

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right, thats common knowledge. theres a bunch of other stuff that op will have to switch over as well depending on what year engine he gets. he'll handle it
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Old 12-27-2012, 02:08 PM   #17
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right, thats common knowledge. theres a bunch of other stuff that op will have to switch over as well depending on what year engine he gets. he'll handle it
I wouldnt say its common for everyone to know that. OP should be made aware of the differences regardless if he knows or not.

Best of luck with the swap OP.

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Old 12-27-2012, 03:01 PM   #18
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I wouldnt say its common for everyone to know that. OP should be made aware of the differences regardless if he knows or not.

Best of luck with the swap OP.
I agree, it's not common knowledge to everyone. Especially someone asking if its the same engine.
Good info
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Old 12-27-2012, 03:07 PM   #19
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I agree, it's not common knowledge to everyone. Especially someone asking if its the same engine.
Good info
I know. that's why i told the OP what cars he could source the engine from

it'll be painfully obvious when the pan is sticking out or doesn't fit.. give the OP more credit.
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Old 12-27-2012, 04:14 PM   #20
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What mileage should I look for? I'm gonna try and get 90k or lower
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