Hi! Carl
Don't know where you take it off on the 912 UL but the 914 has a sensor
already plumbed in .
You need the manifold pressure to know how much power you are applying (
you could be labouring the engine, since the prop is controlling the RPM
the throttle becomes the power applicator. I had this difficulty with
the 3300 Jabiru because they wouldn't give me MP/power/RPM/
ambient/altitude graphs I never knew where the engine was loaded until
many hours experimenting with fuel usage. Of course the Rotax is geared
so the RPM is still more complex.
Usually on a direct drive the rule of thumb is to run "squared" = 24" MP
to 2,400 Engine Rpm, at least in the initial stages of experimentation.
Regards
Bob Harrison G-PTAG.
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of Carl
Pattinson
Sent: 03 September 2008 22:01
Subject: Europa-List: Manifold Pressure Gauge
<carl@flyers.freeserve.co.uk>
I am just filling in the LAA form to change our propeller (from a fixed
pitch to a CS version - Woodcomp/ Smart Avionics controller). The engine
is
a Rotax 912 UL 80hp.
The LAA form says that the installation of a manifold pressure gauge is
mandatory. Anyone know why?
Its probably a dumb question but I dont understand the point of
monitoring
manifold pressure on a normal engine. I always thought it was more
relevant
to turbocharged engines.
Also where does one take the pressure takeoff on the engine - I would
guess
the balancing pipe between the carburettors - is there a mod required on
the
engine?
Thanks for the explanation in advance.
Carl Pattinson
G-LABS
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