Wednesday, November 26, 2014
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Cooling System Reports Minimize
I am posting the following reports in hopes that someone will find the information useful. My coolant temperatures have been high ever since I cleaned up my cowling and painted the coolant tubes that run along the belly. I've spent a lot of time trying various things and decided that I should start documenting this.



October 2, 2010
Altitude: 7,000' MSL
OAT: 69 F.
Density Altitude: 9493'
RPM: 4100
EGT: 1350 F.
Thermostat: None - Restriction plate with 1" dia. hole
Coolant: Water (small amount of residual anti-freeze mixed in)

Coolant Temp Sensor Notes:
  • Swirl Pot: VDO sensor connected to EM3 engine monitor (calibrated)
  • Left Head Outlet: Aux coolant temperate guage with matching sensor
  • Right Head Outlet: Type F Thermocouple connected to coolant port bolt (calibrated)
  • Radiator Inlet: Type F Thermocouple clamped to aluminum coolant pipe about 2' before radiator inlet
  • Radiator Outlet: Type F Thermocouple clamped to aluminum coolant pipe about 2' after radiator outlet
Take off, climbed to 7000', and flew for approximately 20 minutes to stabilize
  • Timing: +5 (from default of zero)
  • Oil Temp: 216 F.
  • Coolant Temp, Swirl Pot: 208 F.
  • Coolant Temp, Left Head Outlet: 220 F.
  • Coolant Temp, Right Head Outlet: 204 F.
  • Coolant Temp, Radiator Inlet: 184 F.
  • Coolant Temp, Radiator Outlet: 172 F.
Made timing change and flew for approximately 10 minutes to stabilize
  • Timing: +2 (from default of zero)
  • Oil Temp: 216 F.
  • Coolant Temp, Swirl Pot: 207 F.
  • Coolant Temp, Left Head Outlet: 218 F.
  • Coolant Temp, Right Head Outlet: 200 F.
  • Coolant Temp, Radiator Inlet: 181 F.
  • Coolant Temp, Radiator Outlet: 166 F.
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