Bob/Ed,

Matt asked the question about what happens when a wet pump fails.   I happen to have an airwolf wet pump so I tried to figure it out.  I couldn't find the plumbing diagram but now I'm wondering if the airwolf sends oil back into the oil system or only lets it out via the air output.

Looking on the web I tried to find anything about failures.  One guy wrote in a blog that the "old wet pumps" make a bigger problem if you have an oil fire.   I suppose that would be true if you lit vaporized oil that came from the pump exit. but that would require burning through the hose that goes to the air/oil sep first.

Colyn

On Jan 23, 2012, at 7:50 AM, Robert R Pastusek wrote:

"The original question was, if you are going to have a backup, what kind of backup is preferred."


Group,

When we built our IV-P, the back-up system was a "wet" vacuum pump, which operated the artificial horizon.  The wet pumps have an excellent service life, having gone several thousand hours without overhaul.  We simply plumbed the discharge of the pump into the oil separator that was already there for the crankcase vent.  It worked for us and has also worked for a IV-P friend of ours who has over 1000 hours on his IV-P.  Before we installed the wet pump on his IV-P, he was losing pumps quite frequently.
It's old technology, but it works and doesn't require electricity.

Ed Smith
Chesapeake, VA







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