Looked this morning in the ER after ours. (Shame on me, never thought of air filters on our boat engines although making diligently all the maintenance and service jobs year by year.)
Here is what I found:
No filter element inside. Found in the www some like this foam element:
Is there really a need for a filter element in the ER of a boat (no dust, no aerosols etc.)?
If yes, how to prevent such a foam strip from collapsing in the air flow if it is just put inside of this box? (Calculated 6.2 liters x 2'500 rpm / 4 cycles = 3'875 liter / minute air flow at wot, should be a flow velocity of 2 meter / second through the surface of the filter!)
Or is such a foamy element put around meaning outside of the filter box?
Thanks for your advice!
best regards / med venlig hilsen