What is CHT and EGT?

What is CHT and EGT?

CHT measures heat energy wasted during the power stroke, when the cylinder is under maximum stress from high internal pressures and temperatures. EGT measures heat energy wasted during the exhaust stroke, when the cylinder is under relatively low stress.

What does CHT stand for in aviation?

A Cylinder Head Temperature gauge (CHT) measures the cylinder head temperature of an engine. Commonly used on air-cooled engines, the head temperature gauge displays the work that the engine is performing more quickly than an oil or water temperature gauge.

What causes high cylinder head temperature?

The CHT is grossly, abnormally high. Either there’s some type of very abnormal combustion process going on in the cylinder (and certainly, pre-ignition should be considered with such a high CHT), or there is abnormally high friction in the cylinder, or the probe is being subjected to unusual heating.

What is EGT gauge aviation?

An exhaust gas temperature gauge (EGT gauge or EGT sensor) is a meter used to monitor the exhaust gas temperature of an internal combustion engine in conjunction with a thermocouple-type pyrometer. EGT gauges are found in certain cars and aeroplanes.

What is a good EGT temp?

1250º to 1300º F.
If everything is working properly, 1250º to 1300º F. is a safe turbine inlet temperature, even for sustained running, mile after mile. Above 1300º F. things can start to get edgy. Remember, excessive EGT damage is cumulative.

How high is too high for EGT?

How Hot Is Too Hot for EGT’s? Based on our own experience in the sled pulling and drag racing world, we can definitely say that any engine running at 1,800 to 2,000 degrees EGT for more than a second or two should be rebuilt every season and may incur turbocharger, cylinder head, or piston damage during the season.

What is peak EGT?

Peak EGT occurs when there is no excess air or fuel. The black band shown in Figure 4 for the lean side of peak EGT indicates how engines vary greatly in their ability to burn lean mixtures. Operating on the lean side of peak impacts the degree of leaning possible.

How do you lower CHT?

Operate lean-of-peak The third way to reduce CHTs is to lean even more aggressively than the POH recommends and operate on the lean side of peak EGT. Figure 1 shows that you can reduce CHTs by 25°F by leaning to about 10°F LOP. For each additional 10°F of CHT reduction, you need to lean an additional 15°F LOP.

How do I lower my EGT temperature?

Installing aftermarket parts to help regulate exhaust gas temperatures will extend the life of the motor and assist with increased performance.

1. Provide additional airflow to the motor by installing an aftermarket, cool air intake in place of the stock air filter.
2. Install a free-flowing, large diameter exhaust system.