Airwolf's Latest Has Advantages
"Are you old enough to know
what that is?" asked John Kochy, at his Airwolf Filter Corp booth,
outside the big hangar at Oshkosh. Being 52, and looking on that
challenge as a... challenge, I replied, "Of course, that's a vacuum
John said, "...a wet vacuum pump." Oil-bathed, in fact.
"The dry pumps are designed to wear out -- that's the only way they
can work, the only way they can seal," he explained. "A wet pump
like this, runs in oil, and lasts a lot longer. We put a 2000
hour, 10-year warranty on these, when your engine uses an oil
These units were so new, the literature hadn't arrived. "We plan
on finishing certification by the end of the year," his daughter,
Brandy, told us.
Wet vacuum pumps haven't been produced for decades; they
had some disadvantages. For instance, it's engine oil that
circulates through them. The pumps need clean oil; and
old metallurgy didn't always stand up well to engine oil's
What if your engine was built since, say, 1953? "Continentals
and Lycomings still have the port," John explained. "They just have
it blocked off. Just re-open it." It's a screw-in plug.
Why reintroduce these wet pumps, if they were discontinued due
to lack of interest so long ago? "They're an improvement on
existing art," John said. Lubrication, filtration, machining, and
metallurgy have all improved measurably since wet pumps were
displaced by the typical dry pups we all know.
Unlike a dry pump, too, the wet pumps don't have to go in any
certain direction -- they're ambidextrous, so to speak. (If you
turn a dry vacuum pump backwards -- that is, if you can
turn it -- you'll wreck it in a moment.)
So, if you'd like to try the latest in ancient technology, all
brought up to modern specs and carrying a marvelous warranty, get
in touch with Airwolf, and with John and Brandy. The pump will sell