MBE4000 APPLICATION AND INSTALLATION
Air Cleaner Selection
Choose an appropriate air cleaner as follows:
1. Determine the maximum engine air
fl
ow requirement and the clean and dirty restriction
limitations from the engine performance curve.
2. Determine the general application category.
3. Determine the air cleaner classi
fi
cation.
4. Select the appropriate cleaner from the manufacturer's recommendations.
4.2.2
RESTRICTION INDICATOR
Air inlet restriction is an important parameter of the air inlet system. High inlet restriction may
cause insuf
fi
cient air for combustion. Factors resulting in a high inlet restriction include:
□
Small intake pipe diameter
□
Excessive number of sharp bends in system
□
Long pipe between the air cleaner and turbocharger compressor inlet
□
High air cleaner resistance
Air inlet restriction that is too high may result in:
□
Reduced power
□
Poor fuel economy
□
High combustion temperature
□
Over-heating
□
Reduced engine life
An air inlet restriction indicator must be
fi
tted on the air intake system.
The operating setting of the indicator should correspond to the maximum permissible inlet
restriction, 5.5 kPa (22 in. H
2
O) maximum for systems with dirty
fi
lters, provided that it is
connected to a tapping point close to the turbocharger inlet.
Altitude affects air inlet restriction The Altitude Performance Curve on page 4-6 illustrates the
effects of altitude on the percentage of inlet restriction (see Figure 4-6). An example of the
reduction of allowable restriction at different altitudes is listed in Table 4-2.
Allowable Restriction
Clean System
Dirty System
25°C (77°F)
2.5 kPa (10 in. H
2
O)
5.0 kPa (20 in. H
2
O)
At sea level
Table 4-2
Air Inlet Restriction at Different Altitudes
The reason for this reduction in allowable restriction is the lower air density at altitude.
All information subject to change without notice.
(Rev. 03/06)
4-11
7SA250 0603
Copyright © 2006 DETROIT DIESEL CORPORATION
