by RitterKreuz » Sun May 02, 2010 9:07 pm
When working with recipricating aircraft engines you have three temperatures of particular concern
1. CHT = Cylinder Head Temperature 500 is a little on the warm side... you would want to see a CHT in a Bonanza of somewhere in the neighborhood of the 350s - 400s tops
2. Oil Temp - easy, just keep it under the red line
4. EGT = Exhaust Gas Temperature, this is the temperature of the Exhaust gasses as they leave the exhaust valve. in a real bonanza you might want to see an EGT of about 1400 degrees to about 1450 tops.
controlling these temperatures should be a fairly easy thing
one thing you can do is open up the cowl flaps, this will allow for greater air flow through the engine compartment. While these are normally closed in cruise flight (or cracked open slightly) they should be fully opened during takeoff, climb or any ground operations to allow for maximum cooling.
another option is the mixture control. A full rich mixture control will typically yield a cooler burning fire, enriching the mixture should produce an almost immediate reduction in CHT and EGT across the board. The leaner you go with the mixture... the hotter the temps will be across the board to a point
lower the nose and climb at a faster airspeed (slower vertical speed) this will allow more cooling air to pass through the engine compartment and help keep temperatures to more nominal levels.
try these things out on your next flight, im sure you will see a difference.
also try running the following power settings for your Bonanza
Takeoff - Prop lever full, Power lever full (assuming its not turbo charged)
Climb - reduce power to 25" manifold pressure, then reduce prop RPM to 2500 RPM to attain "25/25 squared engine"
cruise, 19" manifold pressure with a prop RPM of around 2300 - 2400 RPM
on final approach, set the prop RPM to full and fly it on down to landing.
let me know if this helps control those temps
Last edited by
RitterKreuz on Sun May 02, 2010 9:09 pm, edited 1 time in total.
