kentb
Well Known Member
I finally got around to trying to run LOP. My setup is a lightspeed EI on top and a mag on the bottom. IO-320, CS prop, RV9A with 55 tach hours on a rebuild engine.
Two flight legs of about 1.4 hours each.
The first leg at 7500 ft 2350 rpm 23.4 map. I slowly leaned and here are the number for each cylinder as they peaked:
ch 2 peak at 1452 at 8.3 gph
ch 1 peak at 1415 at 8.1 gph
ch 3 peak at 1430 at 8.1 gph
ch 4 peak at 1431 at 7.9 gph
By the time 4 peaked the engine was starting to run rough and #2 (the first to peak) was 1430 on the EGT. I increased the mixture to smooth operation and the EGT went back up to 1440.
At this setting I was burning 8.2 gph at 149 kts TAS.
On the second leg of the trip I flew at 9500 ft. Again rpm was set at 2350 map was 20.9 and fuel flow was down to 7.7 gph, TAS 147 kts. The EGTs were:
ch1 1380
ch2 1410
ch3 1390
ch4 1389
Do I need to get balance injectors to be able to lean better?
Is there something else I should be looking at?
Kent
Two flight legs of about 1.4 hours each.
The first leg at 7500 ft 2350 rpm 23.4 map. I slowly leaned and here are the number for each cylinder as they peaked:
ch 2 peak at 1452 at 8.3 gph
ch 1 peak at 1415 at 8.1 gph
ch 3 peak at 1430 at 8.1 gph
ch 4 peak at 1431 at 7.9 gph
By the time 4 peaked the engine was starting to run rough and #2 (the first to peak) was 1430 on the EGT. I increased the mixture to smooth operation and the EGT went back up to 1440.
At this setting I was burning 8.2 gph at 149 kts TAS.
On the second leg of the trip I flew at 9500 ft. Again rpm was set at 2350 map was 20.9 and fuel flow was down to 7.7 gph, TAS 147 kts. The EGTs were:
ch1 1380
ch2 1410
ch3 1390
ch4 1389
Do I need to get balance injectors to be able to lean better?
Is there something else I should be looking at?
Kent