Here is the old message Dave:


Subject:        vacuum pumps
   Date:        Mon, 20 Jul 1998 00:40:11 -0700
  From:        Paul <rotaryeng@earthlink.net>
    To:        bit@any

I am always keeping my eye out for vacuum pumps that could be used to
drive gyro instruments. The trouble with the aviation types for rotary
engines is they are designed to be driven from the accessory gear case
on an AC engine. They do not lend themselves to be belt driven as they
don't have the bearings for it. Besides, they are expensive.

Dave Atkins has succesfully used a smog pump as a vacuum pump for gyro
instruments  but it is heavy and bulky. Here is another alternative that
might also work.

http:://www.moroso.com

BTW I was surprised to find the auto racers are using smog pumps to
scanvenge the crankcase oil in dry sump systems.

Paul

 
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