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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 10-14-2011, 11:06 PM   #1
RKiepper
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Engine sleeves?

Can anyone tell me where I get a set of cylinder sleeves for an m52Tu 2.8? Bought a car with a seized engine, gonna rebuild it and swap it into my other e46. Don't even know where to start looking, nothin on search.
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Old 10-14-2011, 11:27 PM   #2
travisn
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who said you need sleeves? maybe it can be bored over and just run oversized pistons/rings.
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Old 10-15-2011, 01:01 AM   #3
RKiepper
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I've read there's not a lot of room for boring over the cylinders in a m52.. Something like 0.5 mm. I simply have more capacity to change cylinder sleeves and rings then the resources to have the block bored over + pistons. I'm more of a hands-on person anyway.
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Old 10-15-2011, 12:10 PM   #4
Jackcat559
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I would imagine a good machine shop would be able to source new sleeves
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Old 10-15-2011, 11:17 PM   #5
RKiepper
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Thanks! I'll have to check around, a google search on this topic came up with people asking the same question.. Only found incomplete or dead threads with nothing on progress. Having a hard time finding any products too. I have no technical info on the m52tu block besides the bore, so I'm lost on the type of sleeves. Wet or dry? Actual thickness?
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Old 10-17-2011, 11:39 AM   #6
mrshelley
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You can bore it to to 0.5 mm and that's all. After that, the cylinder walls will crack. As for sleeves, I have never seen it successfully done as just outside of the stock sleeve, is a honeycomb of aluminum which is integral to the structure of the block. So, it was not designed to be like other aluminum blocks. So, if you can even make it work, it'll end up costing you more than buying a working longblock. The M52TU and M54 share the same block and they were used in hundreds of thousands of various BMW's.
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Old 10-17-2011, 09:53 PM   #7
RKiepper
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I've read reports of attempts remove the sleeves and engines just falling apart. The sleeves are a structural part of the engine block . Ive found an m54, but I think it's seized up too..
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Old 10-18-2011, 07:35 AM   #8
NickG@TechniqueTuning
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The M52TU and M54 can definitely be resleeved if necessary. Been there, done that, with no issues whatsoever. Of course, you need to have a competant machine shop do the work, and not some backyard outfit (ie, no DIY's here). As was mentioned, the stock sleeves can be machined a maximum of 0.5mm oversize. If you need more, then have the sleeve(s) replaced.
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