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Tommy, The fuel pressure going high and the mixture going full rich at the
same time is pretty coincidental not to be related. I'd be looking at the
regulator with some suspicion. The first one I dug out of the used parts
bin for the Renesis was bad. I grabbed the one off my old 2nd gen
engine and it is still flying.
Steve, the sag does sound like the sparkplug problem but a lot of other
things can't be ruled out. Plugs are easiest things to try though.
How many hours on them? Turbo is going to be hard on them, mine last
longer when I'm flying easy.
I couldn't resist the cold air yesterday and went flying locally.
Felt like the power was unlimited! I could climb at 1000 fpm at 200
mph. No exciting stories though, all was wonderfully "boring".
Tracy
----- Original Message -----
Sent: Sunday, December 05, 2004 9:01
AM
Subject: [FlyRotary] Re: power sag and
fuel pressure saga.
Tommy,
This problem sounds very, very familiar. I have
the same issue with the
mixture. In my case, my fuel pressure
regulator was definitely a problem,
as it wasn't maintaining the
pressure. The pressure would really jump up
with both pumps
running.
Even after replacing the regulator though, I still don't seem
to be able to
tune the controller to the proper mixture below 2500
RPM's. Above that, it
seems OK, but is very rich below 2500. I
can though get a change in
mixture, if I rotate the mixture control
CCW. It still runs though at full
CCW at low RPM's. It used to
die.
I saw Ed Anderson's reply to you about the possibility of a
leaking fuel
injector. Perhaps I have the same problem, since it is
not a full moon.
Steve Brooks
-----Original
Message-----
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net]On
Behalf Of Tommy James
Sent:
Saturday, December 04, 2004 6:16 PM
To: Rotary motors in
aircraft
Subject: [FlyRotary] Re: power sag and fuel pressure
saga.
Okay, here's my saga for the day to go along with
Steve's
I departed 31A heading for 28A, famous as the Rotary mecca of NC
and home of
Ed Anderson, OAT 55*, coolant at 180 or so. Cruising at 25x25
when the red
EIS light blinks a warning fuel pressure at 45 or more.
My GPS had ceased
operations for the day, but I had just passed RUQ. I knew
where I was, more
or less. I turned and made a precautionary (read
puckered)landing at RUQ.
Fuel pressure fluctuating from 42 to
52.
The cowling came off, I always carry a few tools, and I checked
the
connections for the fuel pressure gauge which were secure and showed
no
change. A visual inspection of the fuel system showed nothing unusual
and
everything was cool, literally.
After sitting for 30 minutes or more
the fuel pressure read 31 with the pump
and engine off. Not understanding
anything more, I put the cowling back on
and fired it up. Hard
start(longer crank time)so I used the cold start
option. Cranked
right up now, but the mixture meter is off the scale rich..
Not running
very smooth with misses obvious. B controller produced no
change.
After a long taxi, the temp is up to 150 or so. Fuel pressure
now
showing 36 which is normal. Adding backup pump took pressure to 43.
Things
look normal again. Departed with sun in my eyes so I could not read
mixture
meter, but I know it was about 8bars as I started TO roll. Climbed
out to
the north and noticed mixture meter was off the scale rich.
Moving the
control to 9 o'clock made absolutely no change in mixture or
performance.
(this is usually enough to cause a stumble) The
short flight back home was
uneventful, except for my wondering what would
go off next. Electing to
climb as much as possible, I was at 4500 and 7
miles out, so, the low power
glide might have cleared the engine as it ran
smoothly after landing with
mixture reading normal 6 bars. Fuel
pressure back to 32 at idle.
Soooo, does anybody have any
insight? I'll go out tomorrow PM and test
everything and fly for
effect.
Thanks to all,
Tommy
James<><
-----Original Message-----
From: Rotary
motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of Steve
Brooks
Sent: Saturday, December 04, 2004 3:28 PM
To: Rotary motors in
aircraft
Subject: [FlyRotary] Re: power sag
Tommy,
I'm not
certain about the coolant, but the oil was barely 130F, the coolant
was
pretty low.... maybe 140 or so if I had to
guess.
Steve
-----Original Message-----
From: Rotary motors
in aircraft [mailto:flyrotary@lancaironline.net]On
Behalf Of Tommy
James
Sent: Saturday, December 04, 2004 2:26 PM
To: Rotary motors in
aircraft
Subject: [FlyRotary] Re: power sag
Steve, What was the
coolant temp at takeoff? Sounds like the engine went
lean with the
cold temperature and boost. I'd make sure it was 'super rich'
for
takeoff, like 8 bars or more on the EM2 mixture meter.
Regards,
Tommy<><
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