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This is the filter on top of my relocation kit. Any thoughts on the correct replacement? It's taller than a standard one. The writing on top says WZ442 but I can't find any reference to that anywhere. There's also room to go taller again.

Same mounting as stock.

So if I get a Ryco Z7148A I'll be right!?

Z148A. Works on mine.

That's what I've got too on the sr20.

go to Bursons or a oil supplier and they will tell you. Its probably only longer to get easier access. Bigger filters are not a sign that filters are better and generally older cars had bigger filters - generalisation.

They sell Ryco Z148A filters for Mazdas at Bursons.

Dave
Thats a Nissan filter, using a relocated filter unit means that you won't use a Mazda filter.
Z442 ryco suits Nissan Silva, WZ442 is a Wesfil brand, PLEASE use the ryco or genuine Nissan.

Terry

aside from easier access maybe, is there any benefit to using a larger filter ?

I believe the theory is they have a greater surface area so don't clog as fast as smaller one.

Wouldn't a smaller filter creates less of a pressure drop and larger is better if filter changes are missed or happen less often?
Anybody done a pressure comparison?

Larger filter surface area should mean less restriction at the same flow.

A thicker filter element for the same surface area would have a greater pressure drop.


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Larger filters have larger filtration area, reduced flow restrictions, longer life and lower risk of blockage but they can take longer to pressurise which may affect start-up lubrication (including HLA pressurisation if you drive an NA with old lifters). Size doesn't significantly affect cost. What Mazda have tended to do is to fit the largest filter they can. Space restrictions on some motors/manifolds have been the main restriction. The Z148A is standard size for a 121 (among many other larger Mazda donks).

tbro wrote:Dave
Thats a Nissan filter, using a relocated filter unit means that you won't use a Mazda filter.
Z442 ryco suits Nissan Silva, WZ442 is a Wesfil brand, PLEASE use the ryco or genuine Nissan.
Terry

This'll be right then?
http://www.ebay.com.au/itm/Ryco-Oil-Fil ... 338d7f234f

By the way, the position of the relocation kit means there's virtually no restriction on how tall a filter would fit. My understanding is also that bigger means less restriction?

sailaholic wrote:Larger filter surface area should mean less restriction at the same flow.

but the hole to and from the block to the filter is the same size?