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86 Testarossa Wheel disaster!

Discussion in 'Boxers/TR/M' started by Guss23, Apr 16, 2021.

  1. Guss23

    Guss23 Karting

    Jun 11, 2017
    179
    Indianapolis
    Full Name:
    Jason Sharkey
    I am trying to get my 86 looking as new and stock as possible. The original wheels were in good shape but all of them had a few chips and scuffs. I pulled them, disassembles the spline assembly and took them to my powder coater. He called me a week later and said that he tried to blast all of them but could not get through the powder coating that was already on them as because they were magnesium, he did not want to mess with them. Now each of them are partially stripped. I took them to a wheel restorer and he is planning on cooking them to get the old finish off but he didn't know if that would work as magnesium has such a low melting rate (500 digrees) Any suggestions?
     
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  3. V4NG0

    V4NG0 Formula Junior
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    Dec 14, 2018
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    Looking for parts NLA
  4. turbo-joe

    turbo-joe F1 Veteran

    Apr 6, 2008
    7,659
    southwest germany
    Full Name:
    romano schwabel
    same problem I had with my chromodora for my BB. with sandblasting you cannot remove all the "paint" but you will remove the magnesium. so you may take sandpaper and also a dremel to remove all, then get the wheels heated to about 170°C for minimum 2 hours to get all the moisture out. then put on 2 compound primer, then the paint and the clear coat, all wet in wet.
    I tested several things with coating but after a while the coating in the edges got air bubbles.
    now since 1 year I have no problem anymore
    how long ? ? ?
     
  5. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    22,168
    Texas
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    Steve Magnusson
    I believe the TR wheels are a more conventional Aluminum casting alloy -- they are not the difficult-painting "light alloy" (~30% Mg) material used on 308.
     
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  6. turbo-joe

    turbo-joe F1 Veteran

    Apr 6, 2008
    7,659
    southwest germany
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    romano schwabel
    I think so too steve
    but my BB wheels are much magnesium
     
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  8. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    22,168
    Texas
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    Steve Magnusson
    Yes, the older model cast wheels, with little offset, are the "light alloy" (with the high Mg content), but, when they went to wheel designs having very large negative offsets, they had to go to a stronger cast material (as the extra thickness needed to give the required strength in the light alloy would negate any weight benefit of using the light alloy).
     
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  9. Guss23

    Guss23 Karting

    Jun 11, 2017
    179
    Indianapolis
    Full Name:
    Jason Sharkey
    The car is a January 86 car. The wheels are SUPER lite.
    Thanks for all of the help! Kind of feel like this is a AA meeting!
    "Hi, my name is Jason and I am a Testarossa owner"
     
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  10. xplodee

    xplodee Formula 3

    Jan 3, 2017
    1,055
    Allentown, PA
    Full Name:
    Tim
    No way those wheels are the original tool. They simply don't look the same. On the original monodado wheels the inner facet where the pedals of the five spokes bend down have no additional chamfer from the center pentagon. These are wheels based on the later five stud style but made to fit a monodado. I know, it's a subtle difference. But I can spot it a mile away and so can a concours judge
     
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  11. carguy

    carguy F1 Rookie

    Oct 30, 2002
    3,355
    Alabama (was Mich.)
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    Jeff
    Many years ago I refinished a set of "early" wheels, not knowing what the exact material composition was, I was afraid that blasting would be too aggressive, so stripped them and sanded them by hand. I removed 90% of the paint and underneath was a white primer coating that was practically impossible to remove completely. Since this primer was so tough, I left it in place, and finished sanding by hand (Lots of work). I then had a pro-painter prime and paint the wheels, and they turned out beautiful.
     
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  13. jgmblair

    jgmblair Formula Junior

    May 27, 2010
    619
    Winnipeg, MB Canada
    Full Name:
    Jeff Blair
    I just had some cam and valve covers stripped of powder coating on my 308 and they used a very expensive stripper specially designed for this purpose. The chemical is not something the average DIY’er should play with I was told!
     
  14. Guss23

    Guss23 Karting

    Jun 11, 2017
    179
    Indianapolis
    Full Name:
    Jason Sharkey
    Looks like my only option is to have them painted. They are to be completed by next tuesday!
     
  15. V4NG0

    V4NG0 Formula Junior
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    Dec 14, 2018
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    You’re probably right. My eye isn’t sharp enough to see the difference. The wheel’s distributor told me about the tool being purchased when I went to pick up the set at their warehouse.

    Are you talking about the switch from metric (Cromodora?) knock offs in the early examples to the standard (OZ?) knock offs sometime in ‘86? Or when they took the later knock offs and pretty much just put a 5-lug pattern on it? I thought the ‘86 and ‘88.5 wheels were identical except for the obvious aspect.
     
  16. George Vosburgh

    George Vosburgh F1 Rookie
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    May 26, 2011
    3,451
    Pittsburgh, PA
    I have a guy in Columbus, OH that did my '77 308 magnesium wheels if you need it.
     
  17. A348W

    A348W Formula 3

    Jun 28, 2017
    1,670
    North Wiltshire, UK
    You need to find somebody who specialises in magnesium; if they don’t know what they are doing they will destroy them.

    They are about but hard to find. If you were in the uk I could help.

    I can only suggest google searching and maybe looking for somebody who specialises in bike rims as they are magnesium a lot.

    for info. http://www.tpcs-magnesium-refurbs.co.uk/
     

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