Re: [Chrysler300] Dry air filters-1955 C300

[jlsavard@xxxxxxx]

>From my time working in the Air Cleaner Lab at Chrysler Engineering, I can  
tell you that the oil bath type air cleaner only got about 85-87 percent  
efficiency, but that it would go on forever at that rate because the dirt was  
constantly being washed out of the filter by the oil being swept up into  the 
filter material and deposited in the sump of the filter.  It was good  on 
industrial stuff and tractors because of capacity.  If you've ever  cleaned one of 
these things you remember the packed-down sludge in the  bottom.
 
We (The Industry) used Arizona Desert dust for testing.It was specially  
ground to have known percentages of various size particles.  It was  manufactured 
by a division of Generous Motors.  We fed it into air cleaners  being tested 
while varying airflow rates in a predetermined routine.  All  dust that got 
through the filter was captured in an "Absolute Filter" before  getting into our 
vacuum pump.  By weighing all filters before and after  testing we could 
determine percentage of efficiency.
 
The paper filters started out at over 98 percent efficiency when new and  
climbed even higher, to over 99 percent, as they got slightly clogged.   
Eventually the restriction got so bad as to restrict airflow and degrade  performance. 
 I don't recall one ever collapsing, though, unless you  tightened the cover 
down so tight as to deform the element.
 
The very worst filters that I ever saw were the foam ones that were fitted  
over a frame on the top of the carburetor.  They were oiled, then squeezed  
out.  They only filtered to about 70 percent when newly installed.   Then, as 
they accumulated a layer of dirt in the oiled foam the restriction went  up to 
the point where they would catastrophically fail and dump a huge gob of  oily 
dirt down into the carburetor!  I don't remember if they ever got into  
production on Chrysler Corp. products.  I sure see a lot of foam filters on  engines, 
but they are always a thick block, so can't collapse.
 
Without mentioning any names, I am leery of foam filters, and laws of  
physics tell me that the only way to maintain high filter efficiency and lower  
airflow restriction is to use a larger filter!
 
My 2 cents worth...  

Joe  Savard
Lake Orion, MI



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