Ĭatalytic converter temperatures may riseĪfter the engine is shut down due to continued chemical activity in the Temperatures fall immediately upon shut down, and drop below fluid autoignition temperatures within 3 minutes. The majority of dataĪvailable to the authors have shown that exhaust manifold and pipe The surface, the faster the expected rate of cool down. Tests have shown hot surfaces can cool down as much asĤ00 degrees F within 3 minutes of the vehicle being brought to a stop and Unburned gasoline exhausting into the catalytic converter.Ĭooling occurs within minutes of shutdown
Temperatures may also increase if the engine is not functioning properly resulting in improper combustion and Wind, acceleration), exhaust system temperatures can increase dramatically.
When an engine is operated at high RPM or load (upgrade, towing, high Higher temperatures occur in extreme and improper operating conditions Volume of exhaust gas flowing through the exhaust system. Peak temperature is related to engine speed (RPM), engine load, and the Peak temperatures occur at road load, not idle Temperatures, but these sources did not incorporate representative airflow Modeling and dynamometer data show higher catalytic converter Temperature of the exhaust pipe entering and exiting the first catalyticĬonverter on a level road and upgrade to be the following: Turbocharger system components in contact with exhaust gas are frequentlyĪs hot or hotter than other exhaust system components.Ī published study of a 1996 Ford F150 V8 pickup truck showed System temperatures will be reduced at any point of contact with coolerĬomponents of large thermal mass, such as the cylinder head. Upon which the exhaust gas has a greater capacity to transfer heat. For example, a bend in anĮxhaust manifold tube immediately outside the cylinder will have a surface The hottest locations tend to be those for which there is someĬonstriction or impingement of exhaust gas. It is rare to find temperatures this high in normal operation. Manifolds and/or exhaust pipes on some vehicles can reach 1200 degrees F. Ignition include exhaust manifolds, exhaust pipes nearest the manifold,Įxhaust manifold temperatures vary for different vehicles and In a normally operating vehicle, only exhaust system components are hotĮnough to autoignite fuels in the motor vehicle. Typically the exhaust system or the catalytic converter surfaces are the hottest
Or seen by the authors and general principles of vehicle mechanics. Information is based on available published tests, unpublished tests conducted Adding to this difficulty is the fact that exact operatingĬonditions at the time of fire that affect underhood temperatures are also There is limited published information available on underhood surface Underhood surface temperature is one of the manyįactors upon which autoignition is dependent.
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