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phoennix10 (smartish) May 28
Looking at the original defective part, That part never saw an extrusion die. It was a pure casting. You do not get defects like that if it was put through extrusion dies. Even shitty Chinese Al extruders in TaiYuan can’t form defects like that.
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ben k (smartish) May 29
Holy shit. So that’s it. They are actually cast. I’m guessing the machining marks on the sides of the CAs are from some type of finishing process to make them look presentable. This is unbelievable. You ever heard of anyone using CAST suspension parts?
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ben k (smartish) May 29
Me neither, but I'm very inclined to agree with since it seems like he is an expert, and you just don't get that kind of porosity with extrusion. I'm still willing to buy one of these and send it out to someone for analysis.
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ben k (smartish) May 29
Yeah, I'd be ordering a brand new one. Just need someone with the connections to do the testing.
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ben k (smartish) May 29
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phoennix10 (smartish)
thanks for finding this. Proves my point that this was casted. Terrible quality control. As an ex F and DCX auto engineer, I would’ve never casted a suspension part. All these parts should be recalled. @MontanaSkeptic1
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Prof John Frink May 29
Question: Is this use of cast aluminum parts outside of industry standards or merely inadvisable? On the link provided it seems parts of the Grand Cherokee's suspension are made the same way. Sorry if it's a dumb question, I don't know anything about this stuff.
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Investor Gator 🇺🇸 May 29
So this part should be extruded instead of casted? What about comparable cars (by weight)?
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ben k (smartish) May 29
I would never use anything except forged. But that's just me. I always defer to experts like Phoenix
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phoennix10 (smartish) May 29
I suspect IMCs in the material from in the foundry that probably left a void after cutting or machining. Would love to see a 200x cross section and an SEM of that area.
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