re: ram-air to the carbs: I believe there were previous threads discussing
this, and the analysis showed that the ram-air effect is negligible at our
speeds - but the drag penalties could be more significant.
fwiw, ymmv, etc.
Cheers,
Pete
A239
On Tue, Jun 8, 2010 at 8:08 AM, Frans Veldman <frans@privatepilots.nl>wrote:
>
> On 06/07/2010 08:56 PM, Gary Leinberger wrote:
>
> > My understanding is that the Bing carbs on the 912S are not designed
> > for ram air -
>
> They can handle ram air fine. Just make sure that also the float chamber
> vent sees the same pressure. (This means that the whole carb will see
> the elevated pressure, the higher pressure due to ram air is then no
> different than the higher pressure due to flying at a lower altitude.
> The Bing carbs are especially designed to deal with a lot of different
> inlet pressures.)
>
> > The 914 is boosted, but requires
> > numerous other gadgets to allow the Bing carbs to function properly
> > with the excessive pressure.
>
> Not true. The carbs are the same. All the "gadgets" you see on a 914 are
> for different reasons, not to make the carbs work correctly. And of
> course, the float chamber vents are connected to the airbox, so they see
> the higher pressure as well.
>
> If I had a 912, I would try to feed the engine with as much ram air as
> possible.
>
> Frans
>
>
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