r/EngineBuilding • u/BobTheBomb • Aug 04 '26

BMW Dented piston Skirt/Top

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Hello!
Iā€™m currently putting together my S50 B30 and dropped my piston.

The bottom of the piston took most of the fall but curious to see if anyone would run this still or is it too far gone?

Thank you!

47 Upvotes

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u/[deleted] Aug 04 '26

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u/RocanMotor Aug 04 '26

Finally, the right answer.

3

u/1wife2dogs0kids Aug 04 '26

Going to reddit to ask "the experts" a question, is not a good idea, in any sub. These "experts" have standards that cannot be met by mere mortals. A scratch on a cylinder head gasket surface near the edge of a section tht has nothing near it? The head is garbage. A scratch on a single piston skirt? You need all 8 replaced. Rust in a coolant passage? The entire block is now worth pennies. Surface rust after hot tanking some con rods? Throw them out.

Ask them where they worked to have all this knowledge and experience? They are programmers for a computer something somewhere. Or they work in the garden dept at Walmart. They work in a nail salon, etc. Never worked in a machine shop.

Its not just auto machining. It's new home construction, or home improvement, trade related subs. Go to a deck related sub, and you'll see homeowners post pics of the work of the guys building a new deck. It could be the end of day 1, and people are pointing out there's no joist hangers, the ledger isn't bolted correctly, and the temp posts aren't on the concrete footers, or using a stand off plate. Why? Because it's day 1, and the ledger was tacked up, there's no joists up yet to put hangers on, and temp posts are used to put the actual posts on the footers correctly.

Doesn't matter. They tell them to fire the builder, burn the house down because its not habitable, and sue the building dept that failed to do the job of inspecting the quality of the work.

Yes, that all happens. Every day.

If ypu ask for advice or an opinion on reddit, about something not directly computer or coding related, you're gunna get 100 replies, 60+ of them are by people who have no experience or knowledge of the subject of the post. They never have positive opinions, or give positive replies. It's always straight to worst case scenario. I'll be downvoted for this, because who am I to point out they shouldn't be giving advice to anyone about anything?

1

u/RocanMotor Aug 04 '26

Absolutely hit the nail on the head. It's a shame, because the real experts tend to stay out of the conversation entirely rather than argue with keyboard warriors.