|
Re: [FlyRotary] Re: Fuel Injector Sizing
I agree with your statement, Buly. Ideally if
the pressure differential between fuel rail and manifold is kept constant
by use of a manifold reference then that would imply that the fuel pressure
should vary to compensate for different manifold pressure. However, my
fuel pressure is rock steady and this is the second manifold-referenced fuel
pressure regulator I have used with no difference. So either my
manifold-reference fuel pressure regulator isn't or I am misunderstanding what
they are suppose to do.
But, that is my experience. How about others
of you flying what is your experience with fuel pressure??? Does it vary?
The variance corresponds to what??
Thanks
Ed A
----- Original Message -----
Sent: Saturday, January 22, 2005 8:16
AM
Subject: [FlyRotary] Re: Fuel Injector
Sizing
I’ll check it
again Ed, but mine varies. I thought the whole idea of being MAP referenced is
to react to the MAP changes? Other ways we it can keep the pressure constant
without the MAP reff.
Buly
On 1/22/05 7:42 AM, "Ed Anderson"
<eanderson@carolina.rr.com>
wrote:
Hi
Buly,
Actually, I
have a manifold referenced pressure regulator (which if I understand the
concept) attempts to keep the pressure differential between the fuel side
and manifold side of the injector constant. However, Varying engine manifold
pressure (varying throttle opening) does not appear to have any affect on my
fuel pressure. It sits rock steady at 40 psi with one pump and goes up
to 43 psi with both running regardless of throttle position. I would
expect that as manifold pressure rises from opening the throttle that the
fuel pressure would rise to keep the pressure differential constant - but,
if that is indeed happening, I can not detect it.
Ed A
-----
Original Message -----
From: Bulent Aliev
<mailto:atlasyts@bellsouth.net>
To: Rotary motors in aircraft <mailto:flyrotary@lancaironline.net>
Sent: Friday, January 21, 2005 7:57
PM
Subject: [FlyRotary] Re: Fuel Injector
Sizing
On 1/21/05 6:37 PM, "Ed Anderson"
<eanderson@carolina.rr.com>
wrote:
George, my
fuel pressure gauge reads between 40 and 43 psi depending on
whether I have one or both pumps on. I fly with 40 psi (one
pump). My pump (with no flow) will give a pressure of
80 psi, but a regulator keeps it at 40-43 psi. I generally
check my pumps for their no-flow pressure and have noticed over
the 6 years that the pressure of the main pump has decreased from
80 psi to 60 psi - so getting near replacement time. The
spare pump still produces 80 psi - less wear as it is normally
only on for take off and landing.
Ed
A
Hi Ed, do you set your fuel pressure without the engine
running or with? The MAP varies the FP while running, so I Assume 37
psi without engine running would be the benchmark?
Buly
|