Catalytic Converter Outlet Temperature
The catalytic converter reaches normal operating temperature usually between 400 and 600 degrees Fahrenheit. The mean emission of all converters of this type must be less than 20 parts per million of carbon monoxide.
Failure And Performance Elements Of Catalytic Converter In Multi Cylinder Engine Springerlink
Claiming that you can find out if your catalytic converter is bad by checking the temperature using an IR thermometer of the cat close to the O2 sensor and the pipe before close to the engine and after the cat.

Catalytic converter outlet temperature. The function of the sensor is to warn of catalytic converter temperature above the safe limit of 750 C 1380 F. Other designs such as truncated headers 179 or headers with tangential gas inlet are possible but uncommon. If the rear temperature of the catalytic converter is 20 or more degrees hotter than the front your catalytic converter is likely okay.
It is vital to note that overheating catalytic converters are a blaze hazard that is mostly disregarded. If the outlet side is. Read and note the temperature at the weld ring of the outlet pipe.
A large temperature difference can result from a clogged converter that traps exhaust gasses and makes it. The normal operating temperature of a catalytic converter is between 550 and 1600 degrees Fahrenheit with the optimum temperature being about 806 degrees. Apr 04 2013 Use an infrared thermometer to take the temperature of the cat at both the front and rear welds not on.
First widely introduced on series-production automobiles in the US. Video says pre-cat should be 300Fa good cat should be 500F. From there its normal operating temperature can be upwards of 500F 260C.
He studied the temperature. When the converter reaches this temperature it then starts to burn off the harmful emissions such as hydrocarbons nitrogen compounds and carbon monoxide. A very efficient way of testing a catalytic converter for efficiency especially with a failure of emissions specifically a NOX Oxides of Nitrogen failure.
OEM catalytic converters are built for commercial vehicles and use noble elements including Platinum Pt Palladium Pd and Rhodium Rh. Ten converters are manufactured for testing purposes and their emission levels are measured with a mean of 1717 and a standard deviation of 298. Take the temperature readings at the front and rear of the catalytic converter.
In late model engines with fuel injection the combustion is so efficient that the converter has little to process and the difference between the inlet and outlet temperatures may only be 50 degrees F at 2500 rpm. This is a lot less than the old rule of thumb that says a good converter should show at least a 100 degrees F difference. Temp inlet compared to temp outlet of catalytic converter is delta 30-50 dgr celsius so the drop is some 30-50 degr.
The catalyst efficiency increases as the temperature difference Tout - Ti across the converter increases. High operating temperature can be a sign of extra pollutants in the exhaust system. The higher the temperature the better the result of eliminating pollutants if your car is ready for smog testing its best to run the engine and the exhaust system hot before getting the car onto the test center.
If the front is hotter than the back then the cat is restricted. This cat as it is sometimes called has a wide range of temperature operations which begins working when it reaches between 200F 98C to 400F 204C. At idle the converter in.
The average temperatures are highly dependent on the application. Temperatures that are out of this range can be an indication the converter is plugged up. If you are still experiencing problems with the engine and exhaust check the muffler.
It can also result from excess fuel going through the exhaust system. In 2003 Joachim Braun10 at the University of Heidelberg carried out research in catalytic converter. Temperature of gas before CAT is from 350 to 900 degC.
O Temperature Sensor o Oxygen Sensor o NOx Sensor Catalyst Poisoning Removing Catalytic Converter A catalytic converter is a device used to reduce the toxicity of emissions from an internal combustion engine. The catalyst inlet and outlet during circle are shown in the figures 2 and 3. Most converter headers are shaped as cones or funnels with axial gas flow.
Catalytic converter headers provide the transition between the inlet and outlet pipes and the substrate cross-section. Currently most SI petrol engines. How to test a catalytic converter with a temp gun.
Once the engine is up to normal operating temperature measure the exhaust temperature directly before and after the converter using an infrared thermometer. A worn or congested catalytic converter can effortlessly go from its standard working temperature range of about 1200 to 1600 0 F 6489 to 8711 0 C to about 2 0000 F 10933 0 C. The function of the inlet header is to diffuse the inlet flow ie to decrease the gas velocity.
They all state the temp. Market for the 1975 model year to comply with tightening EPA regulations on auto exhaust catalytic converters. How To Test An Automotive Catalytic Converter.
If you dont the catalytic converter is bad and should be replaced. More-recent catalytic-converter designs are not as susceptible to temperature damage and can withstand sustained temperatures of 900 C 1650 F. Without any doubt due to the catalitic proces of inlet CO and O2 producing.
Comparing figures 2 and 3 it can be easily observed that the warm-up time for the inverse mounting condition is smaller. You should see an outlet temp thats 100 F hotter than the inlet temp. If there is a big difference at least 100 degrees then the converter may need to be replaced.
A major car manufacturer wants to test a new catalytic converter to determine whether it meets new air pollution standards.
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