>That, BTW is why I had such problems. The adapter I do have is 5/8" X 5/8".
>And I have no idea which filter will fit this adapter either.
The problem is really and truly just a mole hill, and not a mountain.
Take said adapter with you to a decent sized auto parts store that has a good
book on filters. My
recommendation is the A/C filter book hanging by the filters. It helps to also
have a little note pad and
a pencil
Flip to the back of the a/c filter book and you will find all their filters
listed two ways, one is by
name, the other by size (being height actually) In these listings they give
all the dimensions of the
filters, including screw threads and significant notes. Scan down until you
find a filter that seems to
have the proper thread. Pull it off the shelf and screw the adapter into it to
make sure it fits right.
If it doesn't, try a different thread pitch until you find the right one.
Remember what that right type
is.
Ok, that's the hard part. Now that you've positively identified the thread
pitch, you want to find a
filter that actually fits onto the engine. That's easy. Go to the front of
the book and look up your
car. It'll give a particular filter. The significance here is gasket size.
You want a filter that will
seal up against the boss on your block. All right, now go back to the book
section where you can look up
filters by name and find that particular one that A/C thinks will fit your
engine. Note the dimensions
and that special note they give (I believe for a Spitfire it's note 50, having
to do with anti-drain
valve and something to do with pressure). Look down the list of filters there
until you find one that has
your thread specs, roughly the same gasket diamter, a different package size
(smaller or larger) and the
same special note. You'll find several actually. Take them out of the box and
compare then for fit (as
in do you really want that super skinny PF40 through 44, or would you rather
have that really huge PF-1?).
You can hold them up to one another to decide if the gasket matchup is close
enough too. They all fit
actually, and work properly. As well roughly a dozen other variations. At
least on my Spitfire with the
normal adapter that is.
So, now you know which filters will fit, and that you can put several different
ones on there to get the
effect your after (smaller for easier installation, larger for more
filtration). You are then knighted Sir
Filter Expert, and can pick and chose filters to your hearts content. This
will result in immedate desire
to investigate switching the tiny filter on say a Toyota Pickup into a
substantially larger filter. And
the burning desire to see if a slightly smaller filter can be found for a
certain Honda CRX so that it
will fit down behind the intake manifold from the top.
Never again will you be limited by engine manufacturer recommendations on
filter selection!
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