Always had high CHT's in my 6A....run the majority of mods to lower the CHTs.....here is what I have...chime in....
RV-6A, O-360-A2A (Aerosport / Solid Crank / Carb); Sensenich fixed pitch, cruise prop
Flying for 10 years, 300 TT, frequent flights, 100LL only, AS 100W Oil after break in in 2004.
RMI Micromonitor for individual CHT/EGT's....
Tested the CHT probes several times (ice water / boiling water)
Re-sealed baffles and re-adjusted baffles several times
Opened up bottom of cowl slightly (air exit over pipes)
Started with some small extra luvers...upgraded to larger luvers in the bottom of the cowl
Filed down the cylinders twice and clean extensively
Checked Mag Timing at each annual....
All compressions good at annual...
#2 runs the hottest. But #3 used to be my hot one for several years.
- To keep temps down, I usually reduce power at 1000 ft to 2300 rpm, mixture leaned before takeoff, and I climb no slower than 100 KIAS...
- Temps very high in the climb, but settle down to mid 350's in cruise...
Today:
15C OAT / Field Elevation: 4500 climb to 12,000 at 120 KIAS / 2300 RPM
(Taken in climb / 120 KIAS / 8000 MSL)
CHT/EGT #1: 390 / 1429
CHT/EGT #2: 470/ 1428
CHT/EGT #3 : 353/1406
CHT/EGT #4 : 401/1436
Observations: It runs hot. Not sure why (hence the question). Strangly the EGT's are closer than I would have imagined for a carb set up.
The CHT grouping seems too far apart (and hot), I've thought of the probes themselves, but they seem to test ok and when swapped give similar results.
OK....thoughts...???
RV-6A, O-360-A2A (Aerosport / Solid Crank / Carb); Sensenich fixed pitch, cruise prop
Flying for 10 years, 300 TT, frequent flights, 100LL only, AS 100W Oil after break in in 2004.
RMI Micromonitor for individual CHT/EGT's....
Tested the CHT probes several times (ice water / boiling water)
Re-sealed baffles and re-adjusted baffles several times
Opened up bottom of cowl slightly (air exit over pipes)
Started with some small extra luvers...upgraded to larger luvers in the bottom of the cowl
Filed down the cylinders twice and clean extensively
Checked Mag Timing at each annual....
All compressions good at annual...
#2 runs the hottest. But #3 used to be my hot one for several years.
- To keep temps down, I usually reduce power at 1000 ft to 2300 rpm, mixture leaned before takeoff, and I climb no slower than 100 KIAS...
- Temps very high in the climb, but settle down to mid 350's in cruise...
Today:
15C OAT / Field Elevation: 4500 climb to 12,000 at 120 KIAS / 2300 RPM
(Taken in climb / 120 KIAS / 8000 MSL)
CHT/EGT #1: 390 / 1429
CHT/EGT #2: 470/ 1428
CHT/EGT #3 : 353/1406
CHT/EGT #4 : 401/1436
Observations: It runs hot. Not sure why (hence the question). Strangly the EGT's are closer than I would have imagined for a carb set up.
The CHT grouping seems too far apart (and hot), I've thought of the probes themselves, but they seem to test ok and when swapped give similar results.
OK....thoughts...???
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