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Old 03-11-2008, 10:13 PM   #1
dnanorton
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engine rebuild.

I have a 2000 323i (stock M52tu engine) with 100k on it. I'm wondering how much hp/torque I could get out of a NA engine rebuild for a budget of $7k-$10k.

I know I could go SC or custom Turbo, but thats not the point of this thread. I'm wondering just about NA.
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Old 03-11-2008, 10:30 PM   #2
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Old 03-11-2008, 11:54 PM   #3
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I can build you a higher compression m52tu motor if you can provide the parts. That will let you choose your compression ratio.

What kind of build are you looking for? I did a stock M54 rebuild with no problems, but Ithe customer went for OEM parts only. I could do the same with aftermarket parts if you wanted.
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Old 03-12-2008, 12:05 AM   #4
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Quote:
Originally Posted by dnanorton View Post
I have a 2000 323i (stock M52tu engine) with 100k on it. I'm wondering how much hp/torque I could get out of a NA engine rebuild for a budget of $7k-$10k.

I know I could go SC or custom Turbo, but thats not the point of this thread. I'm wondering just about NA.
I would think you would just get a few hp back that your car had when it was newer. My guess would be about 5 or 6 hp if you replaced things with identical parts. More with aftermarket and performance parts. Like if you decided to go higher compression, hotter cams, equal length headers, and matched software, I think you could see 30hp? Just my guesses.

Edit, I was thinking of the M54B30 engine in the 330, gains would likely be less in the 323 motor. But I believe it is only a few parts like the crankshaft that separate the enginen from the 328 motor.
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Old 03-12-2008, 12:19 AM   #5
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get a newer e46 for the 10k+sell price of your car...just my .02
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Old 03-12-2008, 01:10 AM   #6
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Stroke out to 3.0 spec with higher compression, and a valve job. Contact VAC for parts and know how.
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Old 03-12-2008, 01:12 AM   #7
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I like my car, I bought it new in 2000. I'll be keeping it.

Now back to the post.

With a stroker kit I can get more displacement. I can bump the compression a little with the right pistons while I'm at it, but I still want to run premium pump gas (93 oct) so I don't want to get to crazy. Blue print and balance everything, polish and port the heads at a really good machine shop. Rebuild it up with the right cam, valves, springs, bigger injectors and software to match. Im sure I'm missing something...........

300+ hp is the goal, but I'm just guessing. I'd like to find someone who has done it. I also wonder how it would run ater all that. Would it be streetable? It has to drive everyday.
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Old 03-12-2008, 01:23 AM   #8
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300hp out of a 323 is definitely pushing it if you want to stay NA... If you are looking for those kinds of numbers, I would reccomend doing some more homework. You might be better off going forced induction and calling it a day. 100k miles on a bimmer isnt enough to justify a rebuild in my opinion... I just did a valve job on my 2000 323, but mine has 188k miles... Did a compression check after getting the head job all done and back together and ive still got very good compression across the board. The bottom end of the m52's are pretty solid and can see well over 200k if properly maintained. Should be able to push 300k Id imagine.
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Old 03-12-2008, 09:34 AM   #9
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It'll be alittle difficult to get 300hp out of the m52 without some custom work. Get a 328i short block and fuel injectors, port and polish the cyl head, hot cams, higher comp pistons, with full exhaust and all the bolt ons, a good computer tune and I really bet you'll only be sitting at about 250 hp....unless you really go crazy on the motor.

If you're truly going to do this, don't forget to get a LSD.

You'll probably have a more reliable engine if you just bought a wrecked m3 and did the whole conversion rather than hopping up an m52.

What are your plans for your car?
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Old 03-12-2008, 03:17 PM   #10
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Check out pei330ci's build thread in the Motorsports section.

Quote:
Originally Posted by dnanorton View Post
I like my car, I bought it new in 2000. I'll be keeping it.

Now back to the post.

With a stroker kit I can get more displacement. I can bump the compression a little with the right pistons while I'm at it, but I still want to run premium pump gas (93 oct) so I don't want to get to crazy. Blue print and balance everything, polish and port the heads at a really good machine shop. Rebuild it up with the right cam, valves, springs, bigger injectors and software to match. Im sure I'm missing something...........

300+ hp is the goal, but I'm just guessing. I'd like to find someone who has done it. I also wonder how it would run ater all that. Would it be streetable? It has to drive everyday.
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Old 03-12-2008, 03:39 PM   #11
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Originally Posted by aggieE46 View Post
Check out pei330ci's build thread in the Motorsports section.
Confirm. His is a little extreme, but it give you some good ideas, like VAC's oil baffle and such.
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Old 03-19-2008, 02:35 PM   #12
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pei330ci posts answer a lot of mu questions.

Thanks for pointing me in the right direction.
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