Welcome Guest. Sign in or Signup

2 Answers

EGT

Asked by: 3112 views
Aircraft Systems, Commercial Pilot, Flight Instructor, General Aviation, Private Pilot, Student Pilot

The EGT temperature increases as you lean the mixture until the optimum fuel/air ratio is achieved. Why does further leaning cause the temperature to begin decreasing?

Ace Any FAA Written Test!
Actual FAA Questions / Free Lifetime Updates
The best explanations in the business
Fast, efficient study.
Pass Your Checkride With Confidence!
FAA Practical Test prep that reflects actual checkrides.
Any checkride: Airplane, Helicopter, Glider, etc.
Written and maintained by actual pilot examiners and master CFIs.
The World's Most Trusted eLogbook
Be Organized, Current, Professional, and Safe.
Highly customizable - for student pilots through pros.
Free Transition Service for users of other eLogs.
Our sincere thanks to pilots such as yourself who support AskACFI while helping themselves by using the awesome PC, Mac, iPhone/iPad, and Android aviation apps of our sponsors.

2 Answers



  1. John D Collins on Nov 27, 2014

    At peak EGT, theoretically all of the gas is combined with the available oxygen in the air. This mixture is called the stoichiometric mixture and is approximately 15 to 1 air to fuel. In practice, not all the fuel can be consumed at this mixture. Regardless, excess fuel in richer mixtures cool the combustion, so richer mixtures reduce the EGT. A rich mixture with an EGT of roughly 100 degrees F cooler than peak will usually produce the most power, but the power curve is fairly flat with richer mixtures. On the lean side of peak EGT, the mixtures do not have sufficient fuel to combust with all the available air. As the mixture leans further, the power produced is directly proportional to the fuel flow and therefore the power curve drops rapidly with the reduced fuel flow. Lower power means less heat and the excess air also acts as a coolant.

    +1 Votes Thumb up 1 Votes Thumb down 0 Votes



  2. psequeira on Nov 27, 2014

    Thank you so much John!

    0 Votes Thumb up 0 Votes Thumb down 0 Votes


The following terms have been auto-detected the question above and any answers or discussion provided. Click on a term to see its definition from the Dauntless Aviation JargonBuster Glossary.

Answer Question

Our sincere thanks to all who contribute constructively to this forum in answering flight training questions. If you are a flight instructor or represent a flight school / FBO offering flight instruction, you are welcome to include links to your site and related contact information as it pertains to offering local flight instruction in a specific geographic area. Additionally, direct links to FAA and related official government sources of information are welcome. However we thank you for your understanding that links to other sites or text that may be construed as explicit or implicit advertising of other business, sites, or goods/services are not permitted even if such links nominally are relevant to the question asked.