by Capt. Siva, » 4 years ago
High CHTs generally indicate that the engine is under excessive stress for its own good. That's why it's so important to manage the powerplant in a fashion that limits CHTs to a tolerable value. For Bonanzas and Barons, a reasonable rule-of-thumb is that optimum engine longevity is achieved by limiting CHTs to 380°F. CHTs above 400°F should be considered abusive, and grounds for "doing something right now" to bring them down.
By contrast, high EGTs do not indicate that the engine is under excessive stress. They simply indicate that a lot of energy from the fuel is being wasted out the exhaust pipe rather than being extracted in the form of mechanical energy sent to the propeller. High EGTs do not represent a threat to engine longevity. The engine is simply not capable of producing EGTs that are high enough to harm anything. Therefore, attempting to limit EGTs in an attempt to be kind to the engine is simply wrongheaded.
Having an engine monitor that displays and records CHT and EGT for each cylinder is also absolutely invaluable for detecting and diagnosing a wide variety of engine problems. The art of troubleshooting with an engine monitor is a subject that's so rich and fascinating that I'm in the process of writing a book about it. But to make a very long story short, here's a list of common engine problems and how they show up in CHT and EGT:
by Glenn Martin » 4 years ago
Incorrect....and saying it in all CAPS does not change that.
CHT is a good measure in an aircooled engine, it is a poor measure in a water cooled head engine. EGT can see changes quickly CHT is very slow...again in a water cooled engine.
Horses for courses.
Please Please do not use Air cooled engine articles and rules in a ROTAX engine..this is misleading.
by Roger Lee » 4 years ago
I agree. CHT's in a water cooled engine read way slower than an EGT. EGT would something going on way before a CHT would. They can be used in conjunction with each other like all the readings.
Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell
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