Hello all,
Hope you don’t mind I may be a pain in the butt for a
while. I’m breaking in this new Barrett Precision Engines TSIO 550
and hope some of you won’t mind answering niggling questions that will come up
as I go through the process. I have about 6.5 hours on it now and the
CHT’s are coming down nicely. Still running full rich and cycling the
power in cruise from about 33 inches MAP down to 25” in gradual
increments. Today I got to 12,500 and stayed there about an hour with
CHT’s never going to 400 and after the initial climb and level off, they
stayed below 380. Previous flights, I could not seem to keep #3 below
400 above about 10,000 ft, even when powering back. So it looks like the
rings are seating well and break in is on track.
I did notice one thing that I don’t recall seeing before
during engine run up before takeoff. The EGT’s all went to caution temps
when I switched to the MAG at 1700 RPM. The drop on the MAG has been a
bit high – usually over 100 RPM and inconsistent. Sometimes it could be
95 RPM and it has been as high as 145 RPM. Today I think it
was close to the higher number. I have the EGT caution warning go off at
1475. I know that’s not particularly high but it’s the first time
bitching Betty has gone ballistic six times in a row in short order like
that. As expected there is no drop on the Lightspeed ignition and the
EGT’s don’t seem to change much when selecting only that ignition
source.
Any thoughts on that?
Regards,
John Barrett, CEO
Leading Edge Composites
PO Box 428
Port Hadlock, WA 98339
www.carbinge.com