John,

1. = ; I would set the EGT warning at 1650 degF. On a turbocharged engine,= the only exhaust gas temp to be concerned with is TIT however I have found b= y setting my EGT to 1650 degF, I get an early warning of rising CHT=E2=80=99= s if my EGT=E2=80=99s are slightly high. I run LOP and it is an early r= eminder to lean a little. I find this most relevant when flying at FL 220 an= d up. At full rich you should be in the EGT 1200=E2=80=99s range.=

2. When doing a Mag check, make sure all EG= T=E2=80=99s rise when switching to one mag and all EGT=E2=80=99s drop when s= witching back to both mags. Don=E2=80=99t worry about the drop. I= f you want to do a robust mag check, do this while at cruise power. Caution=E2= =80=A6tell your wife what is about to happen before doing this.

3. The Lightspeed must be advancing the ignit= ion timing at 1700 RPM otherwise I would expect an EGT rise when selecting t= hat source only. ??

Craig Berland

N7VG

Hello all,

Hope you don=E2=80=99t mind I may be a pain= in the butt for a while. I=E2=80=99m breaking in this new Barre= tt Precision Engines TSIO 550 and hope some of you won=E2=80=99t mind a= nswering niggling questions that will come up as I go through the process.&n= bsp; I have about 6.5 hours on it now and the CHT=E2=80=99s are coming down n= icely. Still running full rich and cycling the power in cruise from ab= out 33 inches MAP down to 25=E2=80=9D in gradual increments. Today I g= ot to 12,500 and stayed there about an hour with CHT=E2=80=99s never going t= o 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 w= ell and break in is on track.

&nbs= p;

I did notice one thing that I don=E2=80=99= t recall seeing before during engine run up before takeoff. The EGT=E2= =80=99s all went to caution temps when I switched to the MAG at 1700 RPM.&nb= sp; The drop on the MAG has been a bit high =E2=80=93 usually over 100 RPM a= nd inconsistent. Sometimes it could be 95 RPM and it has been as high a= s 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=E2=80= =99s not particularly high but it=E2=80=99s the first time bitching Betty ha= s gone ballistic six times in a row in short order like that. As expec= ted there is no drop on the Lightspeed ignition and the EGT=E2=80=99s don=E2= =80=99t seem to change much when selecting only that ignition source.

A= ny thoughts on that?

Regards,

John Barrett, CEO