bullojm1
Well Known Member
I've noticed an issue recently where I cannot seem to run LOP smoothly after a long climbout. Going down to SNF I was flying relatively low - 4500' to avoid the headwinds. My CHT's on climbout only got up to about 300 degrees. I had no issues with the engine running smoothly LOP, burning 7.8-8.2 GPH, and leaned out to roughly 20-40 degrees LOP.
Coming back I climbed up to 9,500'. On climbout the CHT's reached 370 degrees. When I tried to lean, the engine would surge and stumble any any mixture setting leaner than peak. I pulled back the throttle to cool the engine down. Once the CHT's went down to the low 300's, I could easily lean the engine LOP.
This is not the first time this has occurred, and it always is correlated to highest CHT's. I am running a Superior IO-360 with a vertical sump, Precision Fuel Injection with the Sam James short cowl and plenum. Oil temps are always around 180 degrees. OAT doesn't seem to matter. It happens with the OAT across the board (except when it is too cold for the CHT's to get above 300).
My thought it is has to be related to the fuel system getting hot - either the fuel divider, fuel pump or the lines going from the divider to the injectors. Before I invest in some thermocouplers to take temperature readings on my fuel system, I thought I'd see if anyone else has had this issue and can offer some advice.
Thanks and I appreciate any assistance!
Coming back I climbed up to 9,500'. On climbout the CHT's reached 370 degrees. When I tried to lean, the engine would surge and stumble any any mixture setting leaner than peak. I pulled back the throttle to cool the engine down. Once the CHT's went down to the low 300's, I could easily lean the engine LOP.
This is not the first time this has occurred, and it always is correlated to highest CHT's. I am running a Superior IO-360 with a vertical sump, Precision Fuel Injection with the Sam James short cowl and plenum. Oil temps are always around 180 degrees. OAT doesn't seem to matter. It happens with the OAT across the board (except when it is too cold for the CHT's to get above 300).
My thought it is has to be related to the fuel system getting hot - either the fuel divider, fuel pump or the lines going from the divider to the injectors. Before I invest in some thermocouplers to take temperature readings on my fuel system, I thought I'd see if anyone else has had this issue and can offer some advice.
Thanks and I appreciate any assistance!