Ch 28 Air Induction Systems
The flame temperature of a diesel can get up to?
3990°F (2199°C)
What are some results of insufficient airflow?
Increased exhaust and combustion chamber temperatures. Low power due to lack of lower combustion pressure, excess air provides greater expansion ratio for combustion gases.
How does air quality affect engine performance?
Colder temperatures have increased density and oxygen molecules. 10°F change above or below the standard 77°F (25°C) results in 1% power loss or gain. Extreme cold inlet temperatures can produce lower pre-ignition temps resulting in reduced fuel vaporization, longer ignition delay time and reduced power.
What gases increase from high combustion temps and how is it lowered?
NOx gas formations and charge air cooling helps lowers combustion temps and NOx gas.
Negative affects of hot humid weather on diesel engine performance?
Combustion chamber is depleted of oxygen, more water vapour will dissolve versus cold days which decreases power and increases hydrocarbons, carbon monoxide and PM emissions. Older engines may smoke more on hot humid days.