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With this scenario, would you try and
adjust the post stage area using Mode 1 or 9, or would you first lower the fuel
injector flow rate using Mode 3? If the rate is lowered, it would put the
below stage area pretty close to the max to adjust it. Adjusting the
after stage area will put it (I think) in the neighborhood of -25 to -50.
With that much difference pre & post staging, I'd start from scratch (reset all modes default) then adjust mode 3 (at wot), Mode 2 (at minimum MP) and Mode 6 (for minimum mixture change at staging) in that order. Then and only then would I adjust Mode 1/9.
Tracy
On Sun, Mar 6, 2011 at 7:20 PM, Bill Bradburry <bbradburry@bellsouth.net> wrote:
Brian,
If what I found today turns out to be the
total problem, you are going to be happy!
First let me say that I installed the
valve in my heater hose as was suggested by Tracy. What would you expect when you work
with hose clamps..right…a leak! So I think that I got that fixed
today. Hope!, Hope!
I taxied out on the ramp so I could
discover the leak and ran the engine up and down the scale. It was pretty
fine below the staging point and then I discovered that it was going rich above
the staging point. I could turn the mixture back to about 9:30-10
oclock and it would stop missing!
I have swapped out the stock red, blue
injectors for all four yellow injectors. As I recall, the red are good
for about 200 CC and the blue for about 500 CC. The yellow are good for
about 350 CC. this means that either setup will give about the same total
output at full bore. But the yellow give much more juice below staging
than the two red would. I have cleared the large secondary mode.
Looking at my MAP table, if find that the
prior to stage area is running pretty consistently around +80. The after
stage area is pretty consistently running around Zero to -15. The after
stage area is too rich and needs to be lowered.
Tracy,
With this scenario, would you try and
adjust the post stage area using Mode 1 or 9, or would you first lower the fuel
injector flow rate using Mode 3? If the rate is lowered, it would put the
below stage area pretty close to the max to adjust it. Adjusting the
after stage area will put it (I think) in the neighborhood of -25 to -50.
If I don’t have a water leak in the
morning, I will try leaning and flying with it like it is. Perhaps letting
it learn using Mode 9..
Bill B
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of bktrub@aol.com
Sent: Sunday, March 06, 2011 1:45
PM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re: Miss
above staging point.
Bill, you are describing what is
happening with my engine exactly. Please find out what is going on with it so
you'll save me the trouble. : )
Sent: Sun, Mar 6, 2011 6:20 am
Subject: [FlyRotary] Re: Miss above staging point.
Last upgrade was 7 Nov 07. for both the
EC-2 and EM-2. I am not certain what was done or when the CAS terminator
would have been done???
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On Behalf Of Tracy
Sent: Sunday, March 06, 2011 8:39
AM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re: Miss
above staging point.
Hi Bill,
When you just need a quick check of differential on EGTs, glance at the EGT bar
graphs on the main page of EM2. If the bars are close to the same height
you know they're OK. Each of the segments on the bars represents about 20
degrees F. One or 2 segments is not a problem, if there is a rotor
differential problem bad enough to cause a miss due to mixture or ignition, it
will be well over 100 degrees in difference, i.e. it will be
obvious. Remember which bar was the low one and that will tell you
which rotor to start looking at.
One other thought: Since you are running the Renesis, did you
have the EC2 upgraded with the Renesis CAS terminator? Don't know if you
were following the thread when that was being discussed a couple of years
ago. The EC2 was originally designed for the 2nd gen CAS and the Renesis
was different enough to need a change. High speed miss or hard starting
were the symptoms.
Tracy
The car the engine came from had about
1400 miles on it. I have run about 40 gallons of gas thru it. I
will have to check the coils for darkening. Also same for plug
wires. I am using the stock Renesis plugs. I might try cleaning
them.
On a previous occasion, I flooded the
engine and it would not start till I sand blasted the plugs. After that
it started normally.
This problem just happened on the second
takeoff. The engine was running smoothly at all rpms till I made the
second takeoff. It started to miss and pop and the rpm would only go to
about 6300. after I got in the air, I dialed the prop back and the rpm
was around 6000 and the engine smoothed out again and was ok the rest of the
flight. Now it is missing on the ground above the staging point. I
have mine set at 16 inches.
I watched the mixture and it seems fine on
both sides of the staging point and also on up in the higher rpms. The
only difference is that the engine starts to miss.erratically. I
didn’t notice the EGT as Tracy
suggested. I need to switch to the page that shows the temp of both of
them and check that today.
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re: Miss
above staging point.
How do the coils look (underneath)?
Are there dark areas in the potting material where they have gotten hot?
There is a history of coil failures in the RX-8's after about 30k miles.
How many hours on the plugs/wires?
How do they look?
I have the stock Renesis coils.
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On Behalf Of Mark Steitle
Sent: Saturday, March 05, 2011
6:19 PM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re: Miss
above staging point.
Which coils are you running? I
chased an intermittent miss which occurred in the 6000 -7000 range. I
upgraded to the LS2 "Yukon"
coils and the miss was gone.
I have developed a miss above the staging
point. The fuel pressure seems ok, the mixture also seems ok. I am
at a loss.
To try and troubleshoot, I am considering
getting above the staging point and disabling the primaries and secondaries to
see if I can identify which is the cause. Since it runs ok below the
stage, I assume it is not the primaries.
I recently changed my fuel filters and
installed a large canister filter. There seems a possibility that I
introduced some contamination that clogged an injector. Other wise it
seems it must be spark related. This just happened one flight ago.
The engine was running fine, till that last takeoff. It was missing and
would only get about 6300 rpm. After take off, I turned the prop back and
slowed the engine down to below that number and it smoothed out and ran fine
the res of the flight. Today while taxiing around, I noticed that the
miss was back.
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