What causes high exhaust temperatures in gas engines?

Fouling of the turbine side of the turbocharger is a common cause for high exhaust gas temperatures. The sequence of events is often as follows: → Fouling of turbine (coke deposit) → Bad turbocharger performance → Lower airflow and charge air pressure → Higher exhaust gas temperatures.

What is the exhaust gas temperature of a gasoline engine?

Gasoline. Gasoline’s chemical structure is not as heavy has diesel’s structure, resulting in a fuel that burns at a lower temperature range. In the end, the exhaust temperature from gasoline combustion is only between 700 and 1,100 degrees Fahrenheit.

What affects exhaust gas temperature?

Combustion Basics Exhaust gas temperatures rise or fall based largely upon the air/fuel ratio, but how the air/fuel ratio affects the EGT depends on the engine itself. Diesel engines work by squeezing the air/fuel mixture until it heats up to the point of ignition, whereas gas engines set the mixture off with a spark.

Why is exhaust gas temperature important?

The exhaust gas temperature (EGT) pyrometer can be one of the most important gauges on a turbo-diesel-powered vehicle. It can warn the driver of situations that are potentially damaging to the engine, and it can also be used as a guide for optimizing fuel economy.

How does an exhaust gas temperature sensor work?

How do exhaust gas temperature sensors work? The NTC element has a high resistance at low temperatures and a low resistance at high temperatures. In other words, its resistance decreases as the temperature increases. Whereas in a PTC element, the most common type, resistance increases in line with temperature.

What does high exhaust temperature mean?

The High Exhaust System Temperature (HEST) Lamp illuminates to indicate that high exhaust temperatures may exist due to aftertreatment regeneration. When this lamp is illuminated, ensure that the exhaust pipe outlet is not directed at any surface or material that will melt, burn, or explode.

What does high exhaust system temperature mean?

High Exhaust System Temperature (HEST) Lamp Indicates that high exhaust temperatures may exist due to aftertreatment regeneration. Aftertreatment DPF Lamp Indicates that the aftertreatment Diesel Particulate Filter (DPF) requires regeneration.

What is the purpose of exhaust gas temperature?

In a piston engine, EGT is a measurement of the temperature of the exhaust gases at the exhaust manifold. As the temperature of the exhaust gas varies with the ratio of fuel to air entering the cylinders, it can be used as a basis for regulating the fuel/air mixture entering the engine.

What is the exhaust manifold temperature?

Manifolds and/or exhaust pipes on some vehicles can reach 1200 degrees F. It is rare to find temperatures this high in normal operation. The hottest locations tend to be those for which there is some constriction or impingement of exhaust gas.

How do you reduce the temperature of exhaust gas?

An intake or exhaust throttle, early or late intake valve opening, cylinder deactivation and in some cases, cylinder cut-out are some ways this can be carried out in practice. Intake Throttling. Intake throttling limits the airflow to the engine and decreases the air fuel ratio.

What is exhaust gas system?

An exhaust system is used to guide reaction exhaust gases away from a controlled combustion inside an engine or stove. The entire system conveys burnt gases from the engine and includes one or more exhaust pipes. Cylinder head and exhaust manifold. A turbocharger to increase engine power.

How does the exhaust temperature affect the performance of a car?

This injects more thermal energy into the gas stream. Some (not all) of that increase in energy goes into increasing the horsepower (or the thrust) of the engine. The rest of the energy blows away out of the exhaust, and you see increased exhaust gas temperatures.

What happens if the exhaust temperature is too high in diesel?

Consequence Of Diesel Engines High exhaust temperature There are lots of consequences which high exhaust gas temperature can cause to the engine parts, these are: – exhaust valve life time reduces up to 50\% if continue with same high temperature. – Cylinder liners wear more faster as required.

Why does the RPMs go up when the engine is running hot?

As rpms go up, a greater volume of hot exhaust gas passes through the exhaust valve in the same amount of time. The more hot gas through the same space, the more that hot gas heats up everything around it: the valve, the valve seat, the manifold, the exhaust pipe…

What to do when the exhaust gas temperature is high?

Also will tell you precautions or solutions to guide you solve such problems. There are several reasons or cause of exhaust gas temperature higher than normal operation recommended range, these includes: – Poor fuel treatment or quality: Bad fuel should be treated before using it.