Oil & Fuel Outer air filter “fins” on 1920

   / Outer air filter “fins” on 1920 #11  
The whirling can also happen due to orientation of the air inlet into the air filter housing.
There are no fins in Kubota F3060 filter either as can be seen in the post #9 drawing.

These things develop and improve over time like all machinery does (not true always).
 
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