Ralf,

I’m pulling the RPM back to 2300, which drops the cruise speed to 260-265 and fuel burn to 14 GPH at FL 220 cruise. My climb and max numbers are almost identical to yours.

Bob

Hello Craig,

Do you have the GAMI injectors or was your engine set up in a special way?

I thought that LOP operations are approved up to 28 inHG. I would like to run mine with 32 inHg but I am afraid to damage something.

Here is what I see so far:

Climb – full power – full rich (this gives me the coolest temps) – 160…170 IAS – CHT 380 – 390 – results in 1600 ft/min (beginning) 800 ft/min (end)

Level off at FL22, FL23 – full power – full rich – TAS 292…297 (on the bezel – I know this reads high) – #3+4 CHT 380 - 390

After this LOP at FL22, FL23 at 28 inHG, 16.1 gph – TAS 270…275 (on the bezel) – #1 CHT 360…375

Like I said I would like to run it at 32 inHg LOP but I am afraid I damage something.

Ralf

Going to Oshkosh:

25,000 ft

ISA +36 degF

2500 RPM

32 inHg

16.9 gph LOP

276 kts TAS (Chelton)

374 degF, #2 CHT

5.1 psi cabin pressure

In my limited IV-P time, I see about 3 kts per 1000 ft altitude increase. CHT’s at 18,000 ft are very low (345 degF) and CHT’s at 25,000 ft are as above when LOP.  I don’t fly ROP except for climb.  OAT significantly affects fuel flow and therefore speed when LOP.  The IV-P is a fantastic traveling machine.

Craig Berland

N7VG