Bilstein Escort Cup Suspension Install Procedure
09-20-2009, 06:09 PM
#16
Rennlist Junkie Forever
One of the people I asked about the effects of powder coating an aluminum load supporting element was a senior engineer where I worked at the time. He has a PhD in metallurgy sciences. Of course, that does not necessarily make him correct, but I took his word for it. I could always place a dial indicator on them while rotating them on the spindle, this would at least give me a good indication of run out.
Well that would make him an expert on the subject for sure. And you could take his advice to the bank at least with respect to this issue. So I guess at 350F it's not an issue. That's good to know.
As an FYI, I read that certain colors and paints require different oven temperatures. This from the "net". Not sure how accurate that is.
The other thing would be interesting to see is the thickness variation on the face of the hub (afffecting runout at the rim).
Do you know (or your friend) what specific alloy the hubs are made out of? I wonder what time/temp the hub alloy will allow before the anneal point is reached. (just wondering to wonder... I don't plan on powder coating my hubs)
TonyG
09-20-2009, 07:21 PM
#17
Three Wheelin'
Excellent write-up.
As for PC on safety critical structural aluminum elements, not a good idea.
The problem is not with annealing, it's with over aging. They can loose some ductility (gets brittle).
As for PC on safety critical structural aluminum elements, not a good idea.
The problem is not with annealing, it's with over aging. They can loose some ductility (gets brittle).
09-20-2009, 09:30 PM
#18
Drifting
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Tony:
Unfortunately, not really a friend, just a man that I worked with in California and that was three years ago. Technically, I was a contracted vendor on site and after finding out his credentials decided to ask his opinion. Was literally a five minute discussion in the hallway, so I guess I should take his recommendation with a grain of salt. Powder coating guy says he does all kinds of aluminum race car parts all the time, but I never asked about hubs specifically. Calipers aren't load bearing but have to hold a pretty tight tolerance on piston bores and they are routinely powder coated. I know that is like apples and oranges, but valid point made by the powder coater. I would be curious to see just how hot the hubs get on a tight course over continuous hot laps, just from brake disk heat transfer. Of course, that would not be sustained, but I imagine it could get quite hot. I could do more research on the subject and probably should, but honestly at this point of the build, it is way down on the list for me.
Unfortunately, not really a friend, just a man that I worked with in California and that was three years ago. Technically, I was a contracted vendor on site and after finding out his credentials decided to ask his opinion. Was literally a five minute discussion in the hallway, so I guess I should take his recommendation with a grain of salt. Powder coating guy says he does all kinds of aluminum race car parts all the time, but I never asked about hubs specifically. Calipers aren't load bearing but have to hold a pretty tight tolerance on piston bores and they are routinely powder coated. I know that is like apples and oranges, but valid point made by the powder coater. I would be curious to see just how hot the hubs get on a tight course over continuous hot laps, just from brake disk heat transfer. Of course, that would not be sustained, but I imagine it could get quite hot. I could do more research on the subject and probably should, but honestly at this point of the build, it is way down on the list for me.
