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VDO and Advanced part numbers.
The
injected 41,315 is VDO # 360-003D
The
carb 41,215 is VDO # 360-043D
Bobby
My Advanced Flight
System EFIS \ EM shipped with a Stewart Warner fuel pressure
sensor. They have had a few failures and now ship with VDO. Go
figure.
Strange indeed. I can't find a listing
anywhere for a VDO electric fuel pressure gauge nor can I find a VDO pressure
sensor that specifically states that it is rated for fuel pressure use.
The ones I found now state that they are NOT rated for fuel. Got a part
number for it?
Tracy
On Tue, Dec 28, 2010 at 3:35 PM, Bobby J. Hughes <bhughes@qnsi.net>
wrote:
Tracy,
My
Advanced Flight System EFIS \ EM shipped with a Stewart Warner fuel
pressure sensor. They have had a few failures and now ship with
VDO. Go figure.
Bobby
From: Rotary motors in
aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of
Tracy Sent: Tuesday, December 28, 2010 1:40 PM To:
Rotary motors in aircraft Subject: [FlyRotary] Re: Fuel rail
pressure
Hello Brian, Here is an excerpt from the updated
EM2 installation guide. Note that this assumes that your EM2 has
been updated since this change was developed (last 2 months or so).
FUEL PRESSURE
SENSOR
The EM2 was originally designed around VDO pressure sensors and the
fuel pressure sensor was to be the same type as used for the Oil Pressure
sensor. VDO at some point changed the design of these
sensor and they are no longer safe to use with Fuel (they
begin leaking from the terminal end). The closest
substitute is a Stewart
Warner 114875.
These are available from Summit Racing as PN
SWW-114875. To make it fully compatible with the EM2 you must
wire a 562 ohm resistor from the sensor output terminal to
ground. This can be added near the sensor or near the
EM2, which ever is most convenient. You must
also set the Channel 13(mixture) Low limit value to 1
instead of 0. The calibration values for the Fuel pressure
channel (12) should then be set to the following values:
Scale factor – 6.922 , LOW END OFFSET – 0, SENSOR OFFSET ~ 963 , LOW
ALARM LIMIT - ~28 , HIGH ALARM LIMIT -~55. Tracy
On Tue, Dec 28, 2010 at 12:10 AM, <bktrub@aol.com>
wrote:
Tracy,
did you ever find a suitable replacement fuel pressure sender? What are
you using now?
Thanks,
Brian Trubee
Sent: Mon, Dec 27, 2010 4:30 pm Subject: [FlyRotary] Re: Fuel rail
pressure
Just for another data point: I installed the fuel pressure
regulator prior to the fuel rails in my 20B installation so there is no fuel
flow to flush vapor from the rails on hot startups. This arrangement
is now used on most new cars. Even with this arrangement I have had no
trouble with vapor lock. Even if it should happen, the
EC2/3 primer function would be able to vent the vapor from the
rails. This setup allows the use of a Floscan type fuel flow sensor
with the EM2/3 since there is no return flow from the fuel rails. No
big advantage other than being much easier to
calibrate. Tracy
On Mon, Dec 27, 2010 at 6:53 PM, <bktrub@aol.com>
wrote:
It seems to me that the fuel would have to be pretty hot for the
vapor pressure to exceed 40 psi and cause vapor lock. Running the fuel
pump in such a case would cause coller fuel to flow through the rail and
back to the tank.
Brian Trubee
-----Original
Message----- From: Al Gietzen < ALVentures@cox.net> To: Rotary motors in aircraft
< flyrotary@lancaironline.net> Sent: Mon, Dec 27,
2010 3:49 pm Subject: [FlyRotary] Fuel rail pressure
Also remember that when you are starting the
engine you are starting it under a load. This is different then in a
car config where in a car you are starting it with no load attached to the
crankshaft. If the fuel rails are getting so hot that they are
vaporizing I would think this would cause an excess pressure in the fuel
system and be very dangerous. This is not a problem I have ever had
in a car. What is causing this besides poor
ventilation?
The pressure in
the fuel rail can never exceed the setting of the pressure regulator;
which should bear about 40 psi engine off. That’s true even if you call
the e-shaft a crankshaftJ.
Al
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