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For what it's worth, I pulled the vacuum pump from my IV at 500 hrs.   I sent
the pump to Parker and asked for a detailed teardown and analysis.  The
report said that normal wear was noted and that it would have easily gone the
full 1000 hours, and why did I pull it ??. Because of all those scary stories
of them not going 500 hrs w/out failure.  Heat is their worst enemy, and if a
cooling shroud is installed it extends their life along with changing the
filter regularly.   Then I remembered that it was my $200 core !!!!  

Mike
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LML website:   http://www.olsusa.com/Users/Mkaye/maillist.html
LML Builders' Bookstore:   http://www.buildersbooks.com/lancair

Please send your photos and drawings to marvkaye@olsusa.com.
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