Five Easy Steps to
Air Cleaner Selection
(1) Determine the Airflow Requirements of the Engine
Additional Consideration
There are 2 different formulas to estimate the airflow (m ³ /min) required by the engine. One formula is based on Engine Displacement (Formula A). The other is based on Engine Horse Power (Formula B).
1. Please be aware that when you have High Pulsation engines the air inflow to the air cleaner is influenced by this pulsation. We recommand that you review the application and if necessary multiply the airflow - found by one of above formula - by the pulsation factor (PF). PF Table 2,1 for 1 cylinder engine natural aspirated. 1,5 for 2 cylinder engine natural aspirated. 1,2 for 3 cylinder engine natural aspirated. 1,0 for 4 and more cylinder engine natural aspirated. 2. No pulsation factor needs to be considered for turbo charged engines. 3. Donaldson ECB, ECC, ECD Duralite ™ (see page 38-42) and the FPG057505 Air Cleaners (see page 67) are not subject to the pulsation factor due to the fact that we use a specially developed High Pulsation media for these products. Example A tractor is equiped with a 40 HP(SAE), 3 cylinder, 4 stroke natural aspirated diesel engine of 2 litres run- ning at 2600 RPM.
Formula A =
Airflow = Engine Displacement x RPM x VE = m ³ /min. 1000 x CF
Engine Displacement • Size of the engine expressed in litres (swept volume) . RPM = Revolutions per minute • VE = Volumetric Efficiency • VE Table 0,85 for 4 stroke natural aspirated diesel engine 1,60 for 4 stroke turbo charged diesel engine 1,85 for 4 stroke turbo charged after cooled diesel engine
1,40 for 2 stroke scavenge blower diesel engine 1,90 for 2 stroke turbo charged diesel engine
•
CF = Cycle Factor = 2 for 4 stroke engine
1 for 2 stroke engine
Formula B =
Airflow = HP(SAE) x SA = m³/min.
Formula A =
Airflow = 2 x 2600 x 0,85 = 2,21 m ³ /min. 1000 x 2
• •
HP(SAE) = Horse Power
SA = Specific Airflow per Horse Power
SA Table 0,057 m ³ /min. for 4 stroke natural aspirated diesel engine 0,065 m ³ /min. for 4 stroke turbo charged/after cooled engine 0,093 m ³ /min. for 2 stroke scavenge blower diesel engine 0,102 m ³ /min. in for 2 stroke turbo charged diesel engine
Formula B =
Airflow = 40 x 0,057 = 2,28 m ³ /min.
In High Pulsation application multiply your answer by FP table which in this case is 2,21 m ³ /min. x 1,2 = 2,652 m ³ /min.
14 n Engine Air Cleaners, Accessories & Service Parts
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