At Lynn Hanover’s urging, I went home last night and cut apart an old Mazda 13B oil filter and a Bosch 3500, which is the Bosch version of the PH8-A or HP-1.  The “Mazda” filter was actually a Pennzoil filter, so it may not be 100% identical to the factory filter.  But, its all I had.  So, it will have to do.  Both were used filters (drained), so the weights may be a little off the mark.  Filter medium of both filters appeared similar, but the Pennzoil filter had a string tied around the filter element.  I suppose it was to keep it from blowing apart?  More likely for facilitating manufacture.  The Bosch filter didn’t have the string.

 

Here’s the data on each:

 

13B filter:

Overall Weight               10.5 oz.

Filter Element

            Weight              3.2 oz.

            No. Pleats         57

            Dimensions       ½ x 2

            Total Area         114 sq. in. (1/2 x 2 x 57 x 2)

 

Bosch filter:

Overall Weight               20.5 oz.

Filter Element

            Weight              10.6 oz.

            No. Pleats         57

            Dimensions       ¾ x 3 ¾

            Total Area         320.6 sq. in. (3/4 x 3-3/4 x 57 x 2)

 

No big surprises here.  From this simple test, I feel very good about my decision to go with the larger remote filter.  Anybody have a K&N they want to cut apart and measure?

 

Mark S.