Porous wheels
Melting Slicks
Joined: Mar 2000
Posts: 2,129
Likes: 737
From: East Coast, USA
- X-ray Radiography
- Ultrasonic Testing (UT)
- Computed Tomography (CT) Scanning
- Dye Penetrant Inspection (DPI)
- Magnetic Particle Inspection (MPI)
- Eddy Current Testing
Drifting
Joined: Mar 2002
Posts: 1,253
Likes: 265
From: 48th state
@x86guru got it right. X-ray radiography is most common method of checking porosity of die castings. However, all die castings have porosity. The question is how much and how large is the porosity? Issues occur when there's too much porosity and/or porosity is large/grouped together causing structural weakness.
Last edited by MagicMtnDan; Aug 6, 2024 at 03:40 PM.
Thread Starter
Pro
Joined: Oct 2013
Posts: 652
Likes: 359
So in case you didn't know, there was a lot of wheels recalled for porosity. No doubt many were not returned having been already replaced with after market rims. It is these to which I am referring and wondering if there is a way to know if a particular rim is in this recall.
Race Director
Joined: Mar 2001
Posts: 19,975
Likes: 6,774
From: Bonneville Salt Flats
Simply go with quality aftermarket fully-forged if in doubt. Consider it part of the price-of-admission and be done with it. GM has crapped out on wheel quality at least since the first series Z06's on the 2001 C5s that were notorious for breaking. 
Race Director
Joined: Sep 2000
Posts: 11,146
Likes: 1,913
From: Missouri City, TX
Do you remember that the 2001 C5 Z06 was the only C5 vette during the entire C5 generation to get “forged” wheels of some type from Speedline?? Early Z production was delayed by lack of wheels, mine by 5 weeks. Then GM fixed the supply chain constraints by changing the Z06 wheels to centrifugal spin cast starting MY2002. All the rest C5 wheels were always centrifugal spin cast. The spin cast wheels were known for breaking the spokes in a collision. I don’t remember forum members complaining of 2001 forged wheels from catastrophic spoke cracking.
E-Ray, 3LZ, ZER, LIFT
Joined: Sep 2007
Posts: 35,045
Likes: 12,412
From: NE South Carolina
So in case you didn't know, there was a lot of wheels recalled for porosity. No doubt many were not returned having been already replaced with after market rims. It is these to which I am referring and wondering if there is a way to know if a particular rim is in this recall.
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