Welding the cracked aluminum supercharger upper housing

  • ilikescars
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16 Mar 2007 14:16 #6580 by ilikescars
ilikescars created the topic: Welding the cracked aluminum supercharger upper housing
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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17 Mar 2007 06:09 #6587 by Mark Tomei
Mark Tomei replied the 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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17 Mar 2007 10:58 #6588 by ilikescars
ilikescars replied the topic:
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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18 Mar 2007 02:19 #6594 by Mark Tomei
Mark Tomei replied the topic:
Thanks, I will give it a try and report back on the success.

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05 Dec 2008 16:04 #12087 by oldbanger71
oldbanger71 replied the topic:
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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06 Dec 2008 03:40 #12106 by Greg Frownfelter
Greg Frownfelter replied the topic:
aluminum oxide media looks pretty good also

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