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Date: Mon, 20 Dec 2004 14:01:40 -0400
From: Jeff Waltermire <jeff_waltermire@ntm.org>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: oven cleaner and aluminum
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When I had a BMW motorcycle I used oven cleaner (eazy off) to take a 
layer off of oxidized aluminum.  It EATS aluminum so be careful where 
you use it.  I used it to my advantage on the motorcycle.  I don't know 
what it does to other metals but I would say use with caution.

For pistons in Continentals (with major lead and carbon deposits) I have 
used a product called BH38 from Spartan chemicals.  We just soaked them 
in it undiluted.  An hour later we removed them and rinsed them with 
water and they were like new.  BH38 is also great for removing oil and 
grease on the engines and hose it off with water.  It doesn't hurt 
aluminum nor rubber.  We have used it here for years with no problems.

Jeff