Bobby, the way I read that statement from
aeromotive – it’s relative to using a hand pump to establish the
vacuum. Since the hand pump develops a very small volume of “static”
pressure difference - any slight leak could indeed “deplenish” its
vacuum very quickly and give poor results. However, when you have a 1300
CC dynamic pump (your engine) pulling down the vacuum continuously - a
slight air leak around the adjustment screw should not normally be noticeable.
So its my opinion, that in regular use a
normal air leak around the screw would probably not have an effect – only
when attempting to adjust it using an hand air pump. However, if you have
an abnormal air leak (excessive) around the screw and have your manifold
pressure sensor on the same line then it certainly could have an effect.
I personally run two separate lines from
the manifold (one from each rotor intake), “H” them together to
dampen pulsation and on to the EC2/3 pressure sensors – nothing else on
these two manifold pressure lines. I run a separate line for my manifold
pressure gauge and pressure regulator.
Ed
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Bobby J. Hughes
Sent: Tuesday, May 12, 2009 9:11
PM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Fuel Pressure
Regulator \ Vacuum Leak
I reinstalled my EC2 yesterday after a few changes
by Tracy. I
immediately discovered a new problem. The lowest MAP address being used was 62
and both primary and secondary injectors fired at all MP and RPM. With Tracy on the phone and
Dennis H supervising my efforts we found a small vacuum leak at the Aeromotive
A1000-6 fuel pressure regulator. After switching the two MP tubes between
A&B controllers the A controller starter working as expected. The EC2
staged properly with lower MAP addresses being accessed. When reinstalling
the EC2 I had switch the MP tubes from my usual configuration. A couple of
weeks ago I had noticed my B controller was not working as expected. I had to
continually adjust the mixture to keep the engine running. Now I know why.
What was unexpected is one MP tube is used for the fuel pressure regulator, B
Controller and my Advanced EFIS engine monitor. The Advanced engine monitor was
not affected by the slight leak. On the other hand the EM3 did see the leak
and was showing static pressure regardless of MP. Here is a note from the
Aeromotive web site.
NOTE: Testing the enclosed regulator by applying air pressure
or vacuum to the vacuum port with a
hand-held
pump will yield poor results, due to the slight air leakage through the
adjustment screw
threads.
This minute leakage, which is typical of all adjustable fuel pressure
regulators, does not, in any
way,
affect the performance of the regulator.
Bobby
Hughes
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