Exhaust Gas Temperature: Gas Vs. Diesel

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The temperature of the exhaust that a vehicle emits directly relates to how well the engine itself is functioning. Both diesel and gasoline vehicles have specific temperature ranges that the exhaust must stay within in order for the components to function correctly.

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.

Diesel

  • In contrast, the heavy molecular structure of diesel fuel requires more heat to trigger combustion within the engine chamber. As a result, the exhaust temperatures emitted are particularly higher than gasoline, ranging from 1,000 to 1,200 degrees Fahrenheit.

Significance

  • If either type of fuel is burning at a higher rate than the acceptable range, the exhaust temperatures will reflect that higher temperature and possibly emit more fumes than normal. When this occurs, the engine should be analyzed for any blockage that restricts air flow or any fuel leaks that could create excess fuel burning.

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