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Attached is plot of data collected from my
EC2 during a throttle up-throttle down sequence that I sent to Tracy in mid
March. The color bars at the bottom show where the actual and expected
(from the operators manual) table addresses for the conditions at that time in
the run aren’t consistent. The mismatch in the color bars at the
lower RPM and MP show areas that I questioned. Higher MP than 23”
are not accessible to me at this elevation since my engine is normally
aspirated, but the higher MP regions seem to behave as described in the manual.
As unkind as it is, I am glad to see that
I am not the only one seeing this behavior. I’m inclined to stop
tearing up my installation trying to find a problem that doesn’t
exist. Apparently the EC2 is just doing things we didn’t expect.
Steve Boese
RV6A, 13B NA, EC2, RD1A
-----Original Message-----
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Bobby J. Hughes
Sent: Wednesday, April 22, 2009
9:01 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: EC2
address range issue
I did hear from Tracy and
he agrees I should not be seeing address 37 under this condition. Will work on
it again next week after SNF.
Bobby
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Mark Steitle
Sent: Wednesday, April 22, 2009
7:46 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: EC2
address range issue
You may want to post your message on the EC-2/EM-2
list also.
On Wed, Apr 22, 2009 at 9:06 AM, Bobby J. Hughes <bhughes@qnsi.net> wrote:
Bill,
I tested moving the rpm /
map threshold (mode 7A) from 2500 to 3000,4000,2000 and 1200. I was still
seeing a problem in this address range. Not sure it was the same exact problem
but same symptoms. Tune it richer one time and then next time it need to be
leaned. With the MAP at 12.5 and RPM at 2270 I would expect to using address 26
or 27 not 37. Address range 32-63 are for above 13" MAP and rpm between
2500 and 3800. 12.5" and 2270 rpm does not meet that condition. But it is
above 10" MAP. Is that a third condition?
I had the same experience
as you reported with mixture address gaps when tuning. I skip from about 42 to
72 when slowly advancing the throttle one address at a time. Advance the throttle
quickly and the engine would miss and cough. I set the skipped address
range back to near 0 and can advance the throttle quickly with little
hesitation. I think it will need to be fine tuned in flight.
From: Rotary
motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Bill Schertz
Sent: Tuesday, April 21, 2009 8:40
PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: EC2 address range
issue
On my EC-2, the map table changes
from low table to high table at 2400 rpm. I don't have a super charger, and my
EC-2 may not be the same model as yours, as Tracy keeps making
changes/improvements.
You are seeing one reading at 3010
rpm and another at 2270, these span the area where mine (according to manual)
switches between low and high map tables.
Bill Schertz
KIS Cruiser #4045
N343BS
----- Original Message -----
Sent: Tuesday,
April 21, 2009 8:20 PM
Subject: [FlyRotary]
EC2 address range issue
I sent an email to Tracy but he's at
SNF this week and not sure he will see it until next week. Though I would
run this by the group.
Mixture Correction Table address
32-41 are giving me problems. Here is an example of what I am seeing.
Address 37 , MAP 12.1, RPM
3010, Val +26, O2- 14.5 Tuned perfect. Move the throttle up and down the
map table and engine starts to run poor in the address range. Adjust throttle
back to Address 37 and things have changed.
Address 37, MAP 12.5, RPM
2270, VAL +26, O2- 12.5 Tuned rich.
I have tuned this range a dozen or
more times. It also happens to be right in my taxi range.
Prop in fixed mode at high rpm
setting.
Supercharger 1" bypass
open so no air is being compressed in manifold.
Prop and supercharger settings do
not seem to make any difference with this problem.
I played around with mode 7A
changing the rpm vs manifold reference points but did not seem to make a
difference.
I can idle at 10" MAP and 1200
rpm.
(last item before flight)
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