nomocom
Well Known Member
Nancy, Welcome to the forum and here's you very own thread
Earlier, you replied.....
The WOT fuel flow is with the boost pump on. The boost pump does not affect the WOT fuel flow at all. Don explained to me that in order to get 18 GPH I need a corresponding volume of air. I tried opening the alternate air but that had no effect. The reason I ponder the low flow is:
1. Does this mean my engine is not developing full HP on takeoff?
2. On hot days (85F) I can see my CHTs approach 400F by the time I get to pattern altitude.
I read that the WOT fuel flow cools the engine. In cruise flight I run LOP and the CHTs will drop below 330F.
Be that as it may, my engine runs so much better after getting overhauled by AFP.
Bubblehead, I look forward to hearing how things go when you get the FI back.
Nancy
__________________
1) maybe, 2) not uncommon, but unrelated unless not very ROP.
Don has a nice closed loop flow bench that measures both fuel and air, so if he says it's ready to do 18 gph on a IO360 (not an IO390), I'd not wonder to much about that until exhausting other possibilities.
The first thing I'd check is calibration of your flow meter. Does your fuel burn on the meter agree with the certified avgas sales meter?
If that is a positive, then confirm the mixture linkage allows going to the rich stop on the controller.
Another check on the controller is how far you are rich of peak, when the mixture knob is forward (should be 200 deg or more ROP).
So, if all those are good, then probably should talk about cam lobes, but I wouldn't go looking for that until the above is answered.
best
Earlier, you replied.....
The WOT fuel flow is with the boost pump on. The boost pump does not affect the WOT fuel flow at all. Don explained to me that in order to get 18 GPH I need a corresponding volume of air. I tried opening the alternate air but that had no effect. The reason I ponder the low flow is:
1. Does this mean my engine is not developing full HP on takeoff?
2. On hot days (85F) I can see my CHTs approach 400F by the time I get to pattern altitude.
I read that the WOT fuel flow cools the engine. In cruise flight I run LOP and the CHTs will drop below 330F.
Be that as it may, my engine runs so much better after getting overhauled by AFP.
Bubblehead, I look forward to hearing how things go when you get the FI back.
Nancy
__________________
1) maybe, 2) not uncommon, but unrelated unless not very ROP.
Don has a nice closed loop flow bench that measures both fuel and air, so if he says it's ready to do 18 gph on a IO360 (not an IO390), I'd not wonder to much about that until exhausting other possibilities.
The first thing I'd check is calibration of your flow meter. Does your fuel burn on the meter agree with the certified avgas sales meter?
If that is a positive, then confirm the mixture linkage allows going to the rich stop on the controller.
Another check on the controller is how far you are rich of peak, when the mixture knob is forward (should be 200 deg or more ROP).
So, if all those are good, then probably should talk about cam lobes, but I wouldn't go looking for that until the above is answered.
best