Hi Paul just two quick questions
1) Out off what vehicle does the planetary drive come from?
2) (Out off interest/ignorance) Can we not use vacuum from the

intake

manifold to drive our instruments?

Thanks for the Newsletter.
Patrick.

Don't forget that at full-throttle operation, there is no vacuum in the
manifold, so you would not have your vacuum instruments during that
time.  The brake booster in cars work well because when you are
braking, the engine is idling and you have a good vacuum in the intake
manifold to power the brake booster.  The vacuum reservoir provides a
few brake cycles worth of vacuum if you decide to do some power braking
:P  Most diesels don't have throttle plates and hence no vacuum, so
they use vacuum pumps.  The old Peugeot diesel that I had used a
diaphram vacuum pump that would go out every 60k or so.

-Eric Holmberg

Tom Kendall wrote:

While stripping down the 20b, I found an air pump with both inlet and outlet
fittings (it was clearly used to pump air *into* the engine... I suspect for
some kind of emissions thing).  While heavy for aircraft use, it sure seemed
like it would handle instrument duty, and probably a darned sight cheaper
and longer lived than an aircraft vacuum pump.  Anybody have experience with
these?

Dave Atkins has been running one for at least four years. Maybe longer.

Paul Lamar
 
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