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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.
Bobby
Bobby,
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.
Ground run settings.
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.
Any ideas?
Bobby Hughes
(last item before
flight)
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