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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > N52B25 vs N52B30



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      09-02-2013, 10:23 AM   #1
jokers_greg
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N52B25 vs N52B30

Got a quick question regarding the two. Are they the same block/head size just the cylinders are bored out a bit to go from 2.5 to 3.0L?

I'm curious if the cylinder walls in the 3L are just thinner, or if the engine is physically larger as well?
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      09-02-2013, 02:04 PM   #2
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the 2.5 has both a smaller bore and a smaller stroke than the nb30. Otherwise the actual blocks and heads are the same. Just different bore size and rotating assembly.

82mm bore x 78mm stroke vs. 85mm bore x 88mm stroke.
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      09-02-2013, 04:21 PM   #3
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Quote:
Originally Posted by mike-y View Post
the 2.5 has both a smaller bore and a smaller stroke than the nb30. Otherwise the actual blocks and heads are the same. Just different bore size and rotating assembly.

82mm bore x 78mm stroke vs. 85mm bore x 88mm stroke.
Right, so the outer dimensions are still the same. However with a larger bore, the cylinder walls would be thinner
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      09-07-2013, 07:35 PM   #4
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Here's an N52 article I found. I suspect your answer and any other info you need may be here. If not, it's a good read.
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File Type: pdf N52 Article.pdf (4.85 MB, 435 views)
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      09-10-2013, 04:41 PM   #5
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Quote:
Originally Posted by Wrngway View Post
Here's an N52 article I found. I suspect your answer and any other info you need may be here. If not, it's a good read.
Awesome article, thanks!
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      09-10-2013, 10:53 PM   #6
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Quote:
Originally Posted by Wrngway
Here's an N52 article I found. I suspect your answer and any other info you need may be here. If not, it's a good read.
Where?
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      09-11-2013, 01:14 AM   #7
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excellent read. thanks.
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      09-11-2013, 06:10 PM   #8
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Quote:
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Where?
It's an attached pdf file. If you're browsing on your phone you might not be able to see it.
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