Hi! Richard
I don't know about 914's.yet but have you thought about Ice possibility
? You didn't mention about use of carb heat on decent?
Regards
Bob Harrison G-PTAG
Robt.C.Harrison
-----Original Message-----
[mailto:owner-europa-list-server@matronics.com] On Behalf Of Richard
Schultz
Sent: 03 August 2006 03:54
I am looking for ideas on a recurring engine problem that caused me 3
precautionary landings on the way from Oshkosh last weekend. The typical
setting was after an hour to hour and a half of cruise flight time the
engine would drop RPM and feel like it was ready to quit. Moving the
throttle forward made it worse and pulling it back made it better. The
first hint of a problem was on landing at Green Bay after coming up from
Texas. The engine ran at reduced power as soon as I came off the
throttle to start the decent for landing from 6500 feet. The initial
thought was the problem came from the longer idle coming down and
fouling the plugs. A change of the plugs and the engine ran on the
ground for 20 minutes going in to and out of full turbo power without a
hitch. The plane was then flown for an hour to Oshkosh and for an
additional hour during the week both at low level (2500') the return
trip started out great and at 6500' and about an hour in to the flight
again the engine lost power. I tried the throttle settings and again
moving up was bad down was good. I tried both fuel pumps on and each
alone, I tried both sets of plugs alone and together with no change in
the engine response at cruise range. Another landing and calls to
Lockwood for advice. They had me inspect the filters with were just
replaced prior to the trip and clean, Next I opened the fuel pressure
regulator to check for dirt, nothing clean as the day it was built. I
next check the carbs to see of they were free floating and they were no
lead build up. I then was told to report the needle valve richer to see
if that would help. Run up on the ground for 20 minutes showed no signs
of problems. Next morning (Sunday) run up on the ground looked good.
Climbed up to 6500 over the airport and hung out doing circles for about
half an hour using the full range of throttle settings. After the half
hour set 5000 RPM and 30 inches and off I went. 30 minutes latter the
same old problem was back. I again made a precautionary landing in Iowa.
Having had all the fun I cold have and no new ideas the plan was left to
think about its behavior and drove home. I am taking my trailer up to
embarrass the plane in from of its new friends and pull the wings and
bring it back to Houston this weekend. Dose anyone have a thought on why
this is happening after a hour or more at cruise power? Flight up was 12
hours with no problems and it just came on very sudden. I have been
burning a combination of avgas and mogas with the trip up being all
avgas. Fuel pumps were tested the week before the flight @ 20 gallons an
hour for each pump.
Comments anyone with a 914 having similar problems?
Aircraft has 95 hours. 914 with an intercooler, AirMaster prop
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