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Steve,
I need to try this:
At 1400 rpm with both INJ ON and
CS OFF, disabling the PRI should cause the engine to quit – if you
quickly set the CS to ON the engine should recover using the SEC injectors. This verifies that both the primary and secondary
injectors are delivering fuel when the cold switch is on and the MAP is below
the staging threshold as suggested above.
I haven’t tried to recover the engine
with the cold start after shutting off the primary. Cold start gives me a
much richer mixture than I get by turning off the secondary. I need to
see if I can tell what is happening to cause the difference.
Bill
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net]
Sent: Monday, January 25, 2016
11:00 AM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re: parts
upgrade; was: What do you think may be happening?
I have taken the liberty of inserting the bold faced
comments below.
Steve Boese
Bill, something you may want to try (if
only temporary) is to separate the Cold Start function from the Injector
Disable functions; I believe this makes it is easier to tell what is going on.
Wire the Cold Start switch independently
to pin 30.
Use one toggle switch to power the PRI
and another to power the SEC injectors.
At 1400 rpm with both INJ ON and CS OFF,
disabling the SEC injectors should do nothing.
At 1400 rpm with both INJ ON and CS ON,
the engine will run very rough due to fuel-doubling to PRI injectors –the fuel is not doubled by the primary injectors, but
rather the secondary injectors are delivering fuel now too. Still, this
is a handy feature for true COLD starting.
At 1400 rpm with both INJ ON and CS OFF,
disabling the PRI should cause the engine to quit – if you quickly set
the CS to ON the engine should recover using the SEC injectors. This verifies that both the primary and secondary
injectors are delivering fuel when the cold switch is on and the MAP is below
the staging threshold as suggested above.
At >4000 rpm and above staging:
disabling either INJ should cause the engine to stumble – if you now set
the CS to ON the engine should recover using the remaining injectors at twice the original pulse width. other
injectors.
My engine is wired this way permanently
…. So is mine.
Jeff
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Steve and Tracy,
The injectors are all four the yellow injectors, 450 CC, I
think. The EC-2 was in Mode 0 when I tested it yesterday.
No, unfortunately, I have not gotten the signal recording setup
going.
Good Luck with the slicing and dicing, Tracy. Is this a second hip or a redo
of the first?
Bill
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On 1/20/2016 12:55 PM, Tracy Crook
wrote:
Steve’s description of how the EC2/3 works was
correct.
Many get this bit confused but The intention with
the disable switch was to use a DPDT switch for the disables.
When in the disable position, the other pole of the switch is used to activate
(switch to ground) the Cold Start input to the EC2/3 at the same time.
This eliminates having to turn off the CS switch when disabling a set of
injectors and enables the EC2 to operate on either set over the full range of
manifold pressures. The EC2/3 is able to see when you have disabled the
primaries and operate the secondary’s even though engine is
operating below stage point.
I’ve been out of touch lately and will be for
awhile. Need to have my hip replaced (again).
Tracy
Sent from Mail for Windows 10
Steve,
I think my engine dies and has little
effect when I turn off the primary and secondary respectively. I will
have to investigate this when I get the switches replaced (I plan to replace
both) I may have something miswired??
It is cold, maybe Tracy
is back in Florida
and will chime in.
Bill
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]
Sent: Wednesday, January 20, 2016
12:32 PM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re: What do
you think may be happening?
Bill,
I have tested the injector disable
function with my EC2's. With the power interrupted to the primary
injectors and the cold switch on, the engine runs on the secondary injectors at
MAP below the staging threshold. I don't know the details of how the
controller treats the cold switch, but it is possible that with the cold switch
on, the controller increases the fuel flow by using both the primary and
secondary injectors at MAP below the staging threshold, and doubles the
injector pulse width at MAP above the staging threshold. I remember
investigating this when first using the controllers but don't remember the
exact details. My backup system does work at low MAP.
Steve
Bobby,
I am sorry I was not
clear and the reason was that I was not clear myself.
The injector disable
switches are for in case you lose an injector in flight and the engine starts
to run on only one rotor. You can disable either of the primary or
secondary injectors which will take the failed injector out of the circuit.
Tracy says you should test this to make sure that it works. That
is where my question came from. You can only test the disable switches
when the engine is not staged. If the engine is staged, and you turn off
the primary injectors, the engine will die because the secondary injectors are
not running, and if you turn off the secondary injectors, the engine will run
rich because you turned on the cold start but the secondaries were not running
anyway.
I am not sure what would
happen if you lost a primary injector in flight, disabled the primary injectors,
then reduced power to the staging point in order to land??? I suspect all
would get quiet! :>(
Bill
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]
Sent: Wednesday, January 20, 2016
11:35 AM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re: What do
you think may be happening?
Bill,
I’m not sure I
understand the question. If your referring to my “center off switch
position” it’s not used in flight. Intentionally anyway J
It’s used to shut down the engine. Primary injector switch of course.
Same switch used for both primary and secondary injectors.
Bobby
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]
Sent: Wednesday, January 20, 2016
10:55 AM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re: What do
you think may be happening?
Changing the subject a
minute…How do you disable the secondary’s when the engine is
staged?? They are not running anyway???
Bill
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