Klaus, I have a 914 and was wondering how I could intercept the fuel
supply line to the carbs. On the 914 there is pressure control block
that has four ports: fuel input, return fuel flow, fuel to port carb,
fuel to S.B. carb. Unfortunately, with two ports for the flow to the
carbs I don't see how only one fuel flow tranducer will work. It may be
possible to cap one fuel port and feed both carbs from the one port. In
this manner only once fuel flow transducer would be required. Not sure
though if the one port could provide sufficient flow for both carbs. Any
thoughts.
Erich Trombley
A028
On Thu, 25 Nov 1999 15:09:38 Klaus Dietrich writes:
> Donald,
> that's exactly what a lot of us flying have done. BTW the flow meter
> that a
> number of us are using is called ELBA and works flawlessly (I know 6
> Europas
> which have it fitted for more than a year, including mine without
> any problems).
> The display has the same size as the VDO engine instruments and
> shows actual
> flow, remaining fuel, remaining endurance and total time. You can
> get it from
> Karine Boveroux in Toulouse. (boveroux.instruments.ulm@wanadoo.fr)
> She will give you excellent service and a good price. Just refer you
> to me. Let
> me know if you like me to send you a electronic picture of my
> installation.
>
>
> Klaus
>
> "Kesterton, Donald" wrote:
>
> > Jerry et al.,
> >
> > Assuming it was possible to find a fuel flow system with a flow
> transducer
> > which was accurate at the flow rates you find with a 912, would it
> be OK
> > (i.e. work accurately) to locate the transducer in the fuel supply
> line to
> > the carburetors, after the fuel return bleed back to the fuel
> tank, the
> > objective being that the fuel flow transducer measures the flow to
> the
> > carburetors only, and not the return flow. This would remove the
> need (and
> > expense) of a differential flow system. What do you think?
> >
> > Donald Kesterton
> > #216
> > G-PATS
> >
> > ----------
> > From: Jerry Davis [SMTP:lts@avnet.co.uk]
> > Subject: Re: Fuel Flow guage
> >
> > I spoke to one of the fuel computer manufacturers about
> this
> > problem. They are looking at a solution but nothing is coming yet.
> The real
> > problem is the fuel return flow. I think all of the less expensive
> flow
> > meters use impeller or vane type senders which generate
> frequency/flow
> > signals. The problem is these devices only operate over reletivley
> small
> > ranges. I have several senders here which work well on Rotax
> engines.
> > Typically they measure a 10 l/hr or 25 l/hr with very acceptable
> errors. The
> > trouble is to have a sensor which measures a high volume you must
> have a
> > large jet over the vane or impeller. The same sensor will not
> generate
> > enough fluid velocity when the flow rates are low to spin the
> impeller.
> >
> > For eample a normal 912 impeller works well above 6 litres
> per hour
> > but it may stall at a little less than this flow rate say 4 l/hr.
> maximum
> > flow is 23 l/hr giving a range of less than 6:1.
> >
> > For the flow return flow rates can be higher than 20 l/hr
> down to
> > nothing.
> >
> > Volumetric or displacment meters may be the only solution
> but they
> > are expensive and I have no experiance with these devices.
> >
> > Jerry
> >
> >
> lts@avnet.co.uk
> >
> http://www.avnet.co.uk/touchdown
> >
> > ----- Original Message -----
> > From: Michael Dawson
> > Subject: Fuel Flow guage
> >
> > Could anyone out there advise me of a reasonably
> priced fuel
> > flow guage ? the cheaper one sold by RD has a 1/8th Inch orifice
> in the
> > transducer which I understand gives flow problem from time to time
> - their
> > expensive one is very expensive as with a 914 you need and extra
> transducer
> > and the lot comes to well over 1000.
> >
> >
> >
> > The Europa List is supported by Aviators Network UK -
> info@avnet.co.uk
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