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      05-12-2020, 04:03 PM   #23
behindthen0thing
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Quote:
Originally Posted by CanAutM3 View Post
Here you go: https://f80.bimmerpost.com/forums/sh...&postcount=188

Most SCH simply result in having to retime the valvetrain. However, some presumed "fixes" have resulted in catastrophic failures. Go figure...

Anyhow, on a stock tune, I have zero worries about a SCH.
Thanks for finding some of that information.

I think the "fixes" that resulted in damage though were because the fixes failed.
Like the sprockets breaking, or them slipping as well.
Never heard of a good slip. It's a novel idea and somewhat interesting to think that there might be a mechanical safeguard on the valve train, but it can't stand to reasoning that this is true.

Sometimes a slip will not make contact. Sometimes slips cause catastrophic damage. I haven't seen a single scenario where a slip prevented any damage.
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      05-12-2020, 04:06 PM   #24
CanAutM3
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I haven't seen a single scenario where a slip prevented any damage.
How could you validate that? If the slip prevented the damage, there would be no damage to show. It's a catch 22. Only BMW design PFMEA would be able to demonstrate this.
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      05-13-2020, 10:17 PM   #25
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Quote:
Originally Posted by sna66 View Post
There is no demonstrated correlation between anything and SCH, especially since BMW doesn't and won't ever acknowledge it as a manufacturing defect
Is it really a "manufacturing defect"?
You are right, not a defect in manufacturing, but a design flaw
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