I have had a problem of the engine surging. It began abruptly. The
previous flights were normal. I am at 500 hours without engine
problems. Now, when I advance the throttle the last one inch(turbo
comes in) the engine starts drops RPM even to the range of 3000. If I
advance the throttle up to about 5500 it runs smoothly, but beyond that
it starts to surge and will continue varying from 3000 to 4000. I have
ruled out any problem with the Airmaster Prop. The surging is too fast
for it to be the prop changing pitch. I talked with Lockwood and they
suggested the carbs need to be overhauled. They suggested the fuel
pumps might be clogged, but checked that and it runs the same pressure
it has for 500 hours. The turbo waste gate cycles correctly(I
think)when turning on the master switch and the turbo spins freely.
does the carb need overhauling or cleaning at 500 hours? Anyone had
this problem?
Ken Carpenter N 9XS Mono 914
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