----- Original Message -----
Sent: Sunday, September 21, 2003 12:12
PM
Subject: [FlyRotary] Re: EC2 in-flight
timing adjustment.
Tracy, More questions stirred up
here...:0)
1. Will best power timing be
different than best economy?
2. What would you guess the EGTs to
be at best power mixture and 5000rpm
3. Is 5-6 bars on the RWS mixture
meter the best power range?
Thanks,
Tommy <><
1.
Establish normal cruise and get the plane *perfectly* trimmed in zero
turbulance air.
2. Lean engine for best economy. This is
about 1525 - 1550 EGT on mine. This varies with altitude &
powersetting.
3. Put EC2 in mode 8 and advance timing 1 step
(1.875 degrees) and note change in rpm (a digital tach w/ <= 10 rpm
resolution is a must).
4. If you got an increase at step 3, repeat until
there is no increase in rpm.
5. Retard the timing 1 step.
Factors to keep in mind. My cruise is typically at
17 - 18" MAP which is below the manifold pressure advance point (this
point is adjustable in Mode 6). The timing is advanced by 5.625
degrees more than nominal timing which is typically 20 - 23 deg BTDC at
rpm > 3600.
I think mine is advanced 1 or 2 steps from default
setting.
Tracy