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Welding the cracked aluminum supercharger upper housing

  • Greg Frownfelter
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06 Dec 2008 03:40 #12106 by Greg Frownfelter
Replied by Greg Frownfelter on topic Welding the cracked aluminum supercharger upper housing
aluminum oxide media looks pretty good also

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  • oldbanger71
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05 Dec 2008 16:04 #12087 by oldbanger71
plastic media gives a as casted look, waterjet ( Aquajet) system gives a ultra-cleen look but still like casted/ bwtween polished and casted.

The more i know, the more i realize that i don't know enough.
812 310 121 S

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  • Mark Tomei
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18 Mar 2007 02:19 #6594 by Mark Tomei
Thanks, I will give it a try and report back on the success.

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  • ilikescars
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17 Mar 2007 10:58 #6588 by ilikescars
Mark: I think plastic beads would give the nicest finish. Others may disagree, but I think it was left as a plain casting out of the factory.
My speedster has a polished aluminum cover, but that's overkill.

Mark

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  • Mark Tomei
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17 Mar 2007 06:09 #6587 by Mark Tomei
Replied by Mark Tomei on topic Supercharger
Any idea of what the best method of bringing back the finish to show quality would be? Plastic media blast? Glass beads? Etc? Thanks.

Mark

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  • ilikescars
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16 Mar 2007 14:16 #6580 by ilikescars
Hi, guys: The supercharger cover has been known to crack, due to Winter freezing. I've been told that in the 30's, the antifreeze was poor quality and would dissipate over a month's time, or someone would forget to pour in antifreeze.

The aluminum in the genny cover was cast in sand, and some of the silica would remain in the aluminum. When the aluminum is welded, the silica turns to glass and causes pitting in the final job. It's best to preheat the aluminum and let it cool for 24 hrs after welding. If pitting occurs, reheat and reweld as necessary. The weld must be "tool hardened" for best results.

Mark

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