air induction and exhaust systems Flashcards
functions of an air induction system
cleans sir supply silences the air inlet flow provides air for combustion cools air allows for extra air flow when turbo and bloswers are used
air silencer is used for
reducing or eliminating loud noises from inlet air
maximum engine performance happens when air is less then
33 degrees
volumetric efficiency of a naturally aspirated engine in good condition
about 75 to 85% of cylinder capacity
factors that affect volumetric efficiency of naturally aspirated engine
operating speed air humidity air temp operating altitude liner and ring condition cam lobes and intake valve adjustment air filters and inlet tube condition
volumetric efficiency of a turbo charged engine
could be as high as 110 %
air filter pre cleaners
used to remove large dirt a debris before it reaches the main section of the air cleaner
pre cleaners may be able to remove as much as 80% of large dirt and debris before air reaches main filter
why do some pre cleaners have angled vanes or blades
so incoming air flow with start a circular motion and fling large dirt and debris to the outside of the filter housing then settling in the dust bowl
exhaust gas aspirator
uses exhaust gas to draw out dust from the dust bowl and blow it out the muffler
has a one way check valve to prevent exhaust gas from entering the air filter
two types of air filters
oil bath
dry type
oil bath air filters
forces air through oil and mesh screens cleaning as it moves through
if air flow is high it can be 98.5% effective
Dry type air filters
can be a single stage or two a stage construction
uses pleated paper as the filter medium dry filters are as much as 99.5% effective in filtration
air inlet and restriction warning gauges
approximate amount of air flow obstruction or restriction by monitoring induction air pressure to filter
