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mikenjulie.parkin(at)btop
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 Posted: Wed Feb 22, 2006 12:53 pm Post subject: 914 Fuel Pumps. |
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I am not sure whether it was Europa or not, but I heard that someone was investigating putting the manual fuel pump on the 914 with electrical back up pumps for the high demand situation. Sounds like a good idea to me.
Does anyone know anything about it.
regards,
Mike
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tonyk(at)kaon.co.nz
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| Posted: Wed Feb 22, 2006 1:57 pm Post subject: 914 Fuel Pumps. |
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With regard to putting a mechanical pump back on to the 914.
I investigated this some time ago and found that non of the pump drive gearing is present in the 914 gearbox so it would be a major mod
Tony.
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Ivor Phillips
Joined: 16 Jan 2006
Posts: 253
Location: London UK
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| Posted: Thu Feb 23, 2006 12:37 am Post subject: 914 Fuel Pumps. |
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Have just checked my 2005 engine and the fuel pump camshaft lobe is in
place,
No problem to fix mechanical back up pump, ( except for running fuel line
back and forth on top of a hot engine)
| Quote: | all the 914 have the eccenter for the pump-drive installed.This is the
status since around 2003. I can't say how the situation was before.
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Ivor Phillips
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rholder(at)avnet.co.uk
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| Posted: Thu Feb 23, 2006 1:02 am Post subject: 914 Fuel Pumps. |
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ivor.phillips wrote:
| Quote: | Have just checked my 2005 engine and the fuel pump
camshaft lobe is in place, No problem to fix mechanical
back up pump, ( except for running fuel line back and
forth on top of a hot engine)
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Ivor,
The mechanical pump is the _primary_ pump as it can't be
switched off !
Of course I have 912S with a mechanical pump, and an
electric pump in series.
Use firesleeve to cover the fuel lines across the top of
the engine. They will be fine.
Richard
G-OWWW High Cross
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BEBERRY(at)aol.com
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| Posted: Thu Feb 23, 2006 1:18 am Post subject: 914 Fuel Pumps. |
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Why should the mechanical pump ( if you can fit one) be the 'back up pump?
It would seem sensible to adopt general G.A., practise and have a permanently
running mechanical pump and electrical back ups which are used only for take
off and when below 3000ft on the approach.?????
Patrick
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mikenjulie.parkin(at)btop
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| Posted: Thu Feb 23, 2006 2:59 pm Post subject: 914 Fuel Pumps. |
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| Quote: | At Take Off the engine produce an manifold pressure of 1350 hPa = 39,9
in.Hg
= 19,6 psi
That means, you need a max. Fuel pressure at the carburetor of 24,7
psi!!!!!!
The mechanical pump delivers 0,15 bar up to 0,4 bar(5,8 psi). Do you see
that difference?!
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Gottfried,
But that 24,7 psi includes the local atmospheric pressure. Consider
pressure at sea level on an ISA day. If the atmospheric pressure was 1013
hpa, then the fuel pump pressure required would be (1350+250)-1013 = 587 hpa
(8.5psi) this as you correctly say is beyond the capability of the
mechanical fuel pump. (Ref - Maintenance Manual p34). However, that is a
max power calculation.
If one considers the max continuous condition as quoted in the operating
manual - 5000 rpm, 31 in/hg, the situation with just the mechanical pump
would be considerably better and certainly sufficient to continue to a
diversion without a problem - all be it at a fairly low altitude.
Example:
Condition - 75% power, 5000 rpm, 31 in/hg. Air box pressure = 1049 hpa.
therefore fuel pump pressure required at 1000 ft (ISA day) - (ambient
pressure = 976 hpa)
(1049+250)-976 = 324 hpa which is 4.7 psi.
Using the minimum pressure required of 0,15 bar a calculated fuel pressure
required from the mechanical pump would be 3.2 psi.
Plainly, pressure altitude is the driving factor here.
kind regards,
Mike (G-JULZ)
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