Brantel
Well Known Member
This thread will serve as a place to help a guy put an end to his CHT limited climb performance.
My RV7 has a Hartzell BA CS prop, Lycoming Narrow Deck O-360 with a carb that was drilled out to a #?? (will have to look at logs) and I see 16.5-17 gph FF on a max power takeoff from 1350ft airport elevation.
I have one mag and one P-Mag and I am running the P-Mag on the base curve with "0" advance shift.
Oil temps run around 175 in the winter and 190-200 in the summer.
My airplane has always been CHT limited in climb performance. On anything but a cool day, my CHT's on #1 & #3 (#3 being the worst) will quickly hit 400° and will go to 425° or more if I let them. (I limit CHT by putting the nose down and building speed. Of course this limits climb performance).
On a hot day here in the Southeast, this issue is exacerbated leaving me with poor climb performance.
During cruise, all CHT's run below 360 on hot days and around 340 on cool days. Oil temps will drop 5-10° from climb temps.
I have looked at my baffles and seals and would say that they are average. I have plugged all the holes that I know of but I know that there obviously is something wrong or I would not be having these issues.
I am going to shift my attention from avionics to getting my engine cooling more efficient.
Next time I have the cowl off I will take some pics and start looking for opportunities.
My RV7 has a Hartzell BA CS prop, Lycoming Narrow Deck O-360 with a carb that was drilled out to a #?? (will have to look at logs) and I see 16.5-17 gph FF on a max power takeoff from 1350ft airport elevation.
I have one mag and one P-Mag and I am running the P-Mag on the base curve with "0" advance shift.
Oil temps run around 175 in the winter and 190-200 in the summer.
My airplane has always been CHT limited in climb performance. On anything but a cool day, my CHT's on #1 & #3 (#3 being the worst) will quickly hit 400° and will go to 425° or more if I let them. (I limit CHT by putting the nose down and building speed. Of course this limits climb performance).
On a hot day here in the Southeast, this issue is exacerbated leaving me with poor climb performance.
During cruise, all CHT's run below 360 on hot days and around 340 on cool days. Oil temps will drop 5-10° from climb temps.
I have looked at my baffles and seals and would say that they are average. I have plugged all the holes that I know of but I know that there obviously is something wrong or I would not be having these issues.
I am going to shift my attention from avionics to getting my engine cooling more efficient.
Next time I have the cowl off I will take some pics and start looking for opportunities.
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