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Old 12-08-2018, 07:10 AM   #1
MclubSport
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Piston identification - HELP !!!

Please help me to identify this piston. I find on 8 weeks on google on facebook on ebay. I can't identify... Was in a block M50 stroker with 328 crank and I have 5 pistons... I want to rebuild the engine.
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File Type: jpg 328-2.jpg (55.8 KB, 29 views)
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Old 12-13-2018, 02:59 PM   #2
CMBusch
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Well, I can tell you it's not from a M50TUB25 or a M25B28. They don't have the dish pistons. Most likely from a M50NV. What's the diameter?

Here's a good website to use. There's a chart with relevant piston info towards the bottom of the page.
https://www.e30zone.net/e30wiki/index.php?title=M5x

EDIT: If you're using those pistons with 135mm rods and a 2.8L crank and they are from a NV, you're going to be 4.88mm above the deck at TDC.

Last edited by CMBusch; 12-13-2018 at 03:07 PM.
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Old 12-13-2018, 11:02 PM   #3
pazi88
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Definitely not m52b28 piston. Doesn't even look like M50NV piston. Maybe m50 vanos piston, but can't be sure. Almost all m5x engines with 84mm bore have flat top piston. And normally BMW pistons have markings on the top of the piston, but those don't have.

Last edited by pazi88; 12-13-2018 at 11:08 PM.
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Old 01-14-2019, 10:16 PM   #4
mini612
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I also would like to know what piston that is as well. It looks similar to the m50nv. Could it be from the m42b18? I have a pics of rods and pistons from; m20b27, m50nv, earlier m50b25tu, later m50b25tu, m52b28 and m54b30. I’ll post them as soon as I figure out how to paste them or download them onto this reply.
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Old 01-14-2019, 10:19 PM   #5
mini612
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Line up (L - R): m20b27, m50nv, earlier m50b25tu, later m50b25tu, m52b28 and m54b30
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File Type: jpg EFAF7C1F-F180-4E05-8562-5F23D9EE2EA9.jpg (77.8 KB, 14 views)
File Type: jpg A8CE26B0-3461-4FA9-AB28-1D794A28A83B.jpg (32.8 KB, 14 views)
File Type: jpg 930EAC7E-E351-4238-9598-D0FAE6D1471E.jpg (48.5 KB, 14 views)

Last edited by mini612; 01-15-2019 at 05:35 AM.
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Old 01-16-2019, 05:52 AM   #6
philakamrbean
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That looks like an s52 piston. If the diameter is 86.4, there's your winner.
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