AFR vs. EGT Gauges: Which Is Better?
EGT gauges were developed much earlier than AFR gauges, and since then, AFR vs. They have been a favorite topic of discussion. For a good period, EGT was the only means to identify the air/fuel ratio in the engine. Still, as the readings were not precise, and people started sensing the limitations, there came a need for some technological advancement that could boost the precision capability of EGT. So in 1992, AFR gauges were developed, and they were known as oxygen sensors. They worked on wideband technology and were high on precision.
What Are Exhaust Gas Temperature Gauges?
EGT gauges are thermocouple gauges used to measure the air-to-fuel ratio of any internal combustion engine. Light piston aircraft and some cars use EGT meters. AFR gauges are oxygen sensors that use the wideband technology and are used along with EGT meters to give an accurate and precise reading that is not possible with an EGT.
What Are Air-to-fuel Ratio Gauges?
AFR gauges are wideband oxygen sensors that use advanced technology to determine the air-to-fuel ratio in any combustion engine. AFR gauges work with and exhaust pipe to get connected to the engine while EGT gauges need to be in direct contact with the engine to get results.
EGT gauges are more prone to wear than AFR gauges, but both of them need a bung that is welded to the exhaust to give their readings. AFR gauges may be more precise and accurate, but they can’t withstand extremely high temperatures and certain fuels as well. EGT gauges are economical than AFR gauges. Also, EGT gauges can be used alone, but AFR gauges are generally used as a peripheral aid to EGT gauges.
Some Other Comparisons
EGT gauges and AFR gauges generally give different values depending on the fluctuations of the temperature of the engine and the placement of these gauges. AFR gauges give an overall reading, whereas EGT gauges give more narrowed details or to say limited readings.
EGT gauges, since first discovered, were used in the aviation market extensively. Since then, pilots have relied only on EGT readings and are still working with EGT gauges only. They use AFR gauges as a helping tool along with EGT gauges but never as primary air-to-fuel ratio determiners.
The Final Conclusions
AFR gauges may be more precise, but they can’t withstand certain temperatures or conditions. To cover this flaw, they are partnered with EGT gauges, which can also detect the temperature of the environment around.
With all the comparisons and researches, it has been observed that EGT gauges and AFR gauges have to be used together to get accurate and precise readings of any internal combustion engine because that way they can negate the limitations of one another and give accurate results despite adverse conditions.