On Jun 6, 2010, at 12:38 PM, Frans Veldman wrote:
> While solving my cooling problems, I learned a few things:
> 1) Naca ducts provide no ram air, but merely "allow air to get in".
To all you 912S powered flyers,
Page 8-1 of the Europa "912 Rotax installation manual" states:
> The engine inlet air is fed through a NACA duct situated in the top
> cowling. It passes into a plenum
> chamber which feeds the air directly to the carburettors. This
> ensures that the coolest air available is
> used at all times, thus ensuring no reduction of engine performance.
If Frans is correct, it would appear to follow that the 912S plenum
does not offer inlet air to the carbs under ram air pressure.
And since the 914 engine inlet is a NACA vent also, the same would
apply.
I'm surprised...having thought that engine performance benefits when
the carb gulps air which is above ambient pressure.
Any wisdom to pass on to a heretic?
Fred
A194 (w/ Sube)
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