pothole vs. brand new ACDelco LCA - TCCoA Forums
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post #1 of 26 (permalink) Old 03-06-2019, 06:55 PM Thread Starter
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pothole vs. brand new ACDelco LCA

And the winner is...POTHOLEEE
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post #2 of 26 (permalink) Old 03-06-2019, 07:34 PM Thread Starter
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Hit a pothole coming off the highway in heavy traffic in Providence, RI. Obviously it was a massive pothole and I didnt have a chance to swerve around it with the rush hour traffic. Parked it for the night and ordered a Moog LCA. Going to go there and fix it on the spot. At least i wont have to worry about anything being frozen since its a new part.
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post #3 of 26 (permalink) Old 03-06-2019, 08:02 PM
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That wasn't the control arm's fault; it broke where it hit.

A straight line is a good sign of massive overload; but you can see where the arm hit the upper parts in the pic.

6000 lbs = 0k 20k lbs, not so much.

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post #4 of 26 (permalink) Old 03-06-2019, 09:09 PM
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On one hand, it shows how robust the ball joint is, on the other hand I wonder how a TRW/Moog would fare in the same impact. I'd expect the arm to bend rather than snap.

-Matt
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post #5 of 26 (permalink) Old 03-06-2019, 10:00 PM Thread Starter
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I would have expected the same thing. My dads been a mechanic his whole life and never saw one snap. He did see them bend
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post #6 of 26 (permalink) Old 03-06-2019, 11:26 PM
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Look at the I-shape of the LCA in cross section. It's not going to bend much that way if any, due to how it's shaped.

RwP

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post #7 of 26 (permalink) Old 03-06-2019, 11:38 PM
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Quote:
Originally Posted by RalphP View Post
Look at the I-shape of the LCA in cross section. It's not going to bend much that way if any, due to how it's shaped.

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No different than bending a connecting rod

-Matt
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post #8 of 26 (permalink) Old 03-07-2019, 06:44 AM Thread Starter
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ya shape has nothing to do with it. Its the how soft or hard the steel is. they must heat treat those LCAs because untreated steel bends. Im guessing they didn't heat treat it correctly. luckily the strut rod kept my wheel for falling off while i was still in motion.
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post #9 of 26 (permalink) Old 03-07-2019, 11:15 AM Thread Starter
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Funny...it didnt look like that when I put it on haha
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post #10 of 26 (permalink) Old 03-07-2019, 01:03 PM
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That arm seems like it cracked in a way that cast iron does. Is that what it's made of?

Kind of concerning seeing that. I'm still running the OEM lower arms in both my cars. I'm one of the few that prefers to squeeze new lower ball joints in, instead of replacing the entire arm. I find it easier to do that way and you can still get the OEM TRW ball joints at rockauto for almost nothing.

My Tbird has taken some pretty hard hits, since I also run it through the Winter, never had that happen thank God.

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post #11 of 26 (permalink) Old 03-07-2019, 01:09 PM Thread Starter
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This arm was already cracked. You can tell with black from oxidation that a crack had already started before the complete break. yes it was cast steel
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post #12 of 26 (permalink) Old 03-07-2019, 01:10 PM Thread Starter
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Good news is shes up and running. Replaced the ACDelco arm with a Moog.
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post #13 of 26 (permalink) Old 03-07-2019, 01:13 PM
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Quote:
Originally Posted by Kenz View Post
That arm seems like it cracked in a way that cast iron does. Is that what it's made of?

Kind of concerning seeing that. I'm still running the OEM lower arms in both my cars. I'm one of the few that prefers to squeeze new lower ball joints in, instead of replacing the entire arm. I find it easier to do that way and you can still get the OEM TRW ball joints at rockauto for almost nothing.

My Tbird has taken some pretty hard hits, since I also run it through the Winter, never had that happen thank God.
I wonder if the OEM/TRW/Moog arms are forged rather than cast. I’m just speculating but are the ACDelcos are noticeably beefier in size than them, like their UCAs? Perhaps it’s possible they simply use a thicker casting to compensate for inferior metallurgy.

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post #14 of 26 (permalink) Old 03-07-2019, 01:25 PM
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Perhaps it’s possible they simply use a thicker casting to compensate for inferior metallurgy.
I was wondering that same thing. If that is true, it would probably hold true for the upper control arms as well. I specifically bought larger upper arms, NOS Dorman brand, harder to find... I did because of the larger size which I assumed meant they would be stronger. Maybe that isn't the case....

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post #15 of 26 (permalink) Old 03-07-2019, 02:08 PM Thread Starter
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When I compared the 2 arms side by side the Moog was slightly more beefed up. Acdelco looks pretty crappy in metal quality and now Im thinking they paint there product to hide the quality appearance. Moog was bare metal and looked better quality from what I could see. Id like to see if Moogs they are pited like the Acdelco on the inside.
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post #16 of 26 (permalink) Old 03-07-2019, 02:12 PM Thread Starter
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The Moogs definitely looked forged so now that I think of it should be solid instead of pited.
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post #17 of 26 (permalink) Old 03-07-2019, 02:13 PM
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You should be able to get a replacement for that through either the reseller or the manufacturer. That's WAY not typical, and the photo of the break clearly shows it was a manufacturing flaw which caused it to fail there.
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post #18 of 26 (permalink) Old 03-07-2019, 03:06 PM
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No different than bending a connecting rod
Last time I looked, connecting rods were mainly end thrust one end, rotational the other; not cross like that was. And plenty of connecting rods have become 2 piece or more designs during failure ...

The previous break (pointed out by jtavares0701) sure didn't help any.

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post #19 of 26 (permalink) Old 03-07-2019, 03:20 PM
No, Mr. Lemmywinks, No!!!

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That cross section is good metal; the crack cause water ingression, that started working on it.

Rust applies a lot of force as it grows.

That's what good metal looks like, broken. Small grain boundaries, and no 'elastic deformation".

If it stretches like taffy, that's when you know the metal is crap.

I'd bet you couldn't break one of those with a sledgehammer, personally.

I have an old one; when it gets warm this year, I'll give it a shot.

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post #20 of 26 (permalink) Old 03-07-2019, 08:01 PM Thread Starter
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Quote:
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You should be able to get a replacement for that through either the reseller or the manufacturer. That's WAY not typical, and the photo of the break clearly shows it was a manufacturing flaw which caused it to fail there.
Yes i did look into it. I ordered both sides off Rock Auto. They dont warranty parts but Acdelco does. Im going to try to get credit towards a different part. I already fixed my bird with a Moog and honestly dont want to put another Acdelco suspension part on my car.
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post #21 of 26 (permalink) Old 03-07-2019, 08:34 PM
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post #22 of 26 (permalink) Old 03-08-2019, 05:15 AM
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See if you can get anything from Providence, I'm sure you're not the only one that hit that.

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It's not a 97 Sport, it just looks like one!

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post #23 of 26 (permalink) Old 03-08-2019, 08:27 AM Thread Starter
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Quote:
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See if you can get anything from Providence, I'm sure you're not the only one that hit that.

Joe
I looked into that and unfortunately the state of Rhode Island wont cover property damage because my bird is registered in Massachusetts. If my I had her registered in Rhode Island I would be covered by that law.
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post #24 of 26 (permalink) Old 03-08-2019, 08:29 AM Thread Starter
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See if you can get anything from Providence, I'm sure you're not the only one that hit that.

Joe
RodeoJoe wow your not to far from me. Im from Attleboro Massachusetts
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post #25 of 26 (permalink) Old 03-09-2019, 05:00 AM
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Hi neighbor!

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It's not a 97 Sport, it just looks like one!

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post #26 of 26 (permalink) Old 03-09-2019, 08:00 AM Thread Starter
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hey there! I cleared out a chunk of land some years back for a shopping plaza down in Franklin by Tri County high school. some big trees there even needed a crane to get em down.
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