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Originally Posted by chesbb
I just purchased a 128i E88. When I run the VIN it tells me that I have a N51 engine. Can someone tell me what is the difference between the N51 & the N52.
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There are a lot of 128i owners here and I'm sure someone will chime in, but in the meantime, this popped up in a quick google search (same engines in the E9x cars).
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The N51 has the three-stage intake manifold and the N52 does not. BMW used the three-stage intake manifold on the N51 to compensate for the slightly lower compression ratio as compared to the N52, 10.0:1 compared to 10.7:1. They are both rated at 230 horsepower.
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https://www.e90post.com/forums/showthread.php?t=1173511