Oversized oil filter

[project.r.racing]

The Z148A is standard size for a 121 (among many other larger Mazda donks).

Z436 is the standarsd size for most 90s B series engines.

The Z79A only were attached to BPTs and MX5s for some reason. All other b series engines, including BP engines got the Z436 attached.

[manga_blue]

Here you go:

[sailaholic]

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?

True but the filter is normally a much bigger restrictor then the oil passages to the filter and back.

Also by reducing the pressure drop across filter allows for higher pressure after the filter which means more flow


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[project.r.racing]

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?

True but the filter is normally a much bigger restrictor then the oil passages to the filter and back.

Also by reducing the pressure drop across filter allows for higher pressure after the filter which means more flow


Sent from my iPhone using Tapatalk

Yes that could be true depending on the resistence the paper give while oil travel through it.

Seems like a bit of googling need to be done to find an answer.

[SuperMazdaKart]

The Z148A is standard size for a 121 (among many other larger Mazda donks).

Z436 is the standarsd size for most 90s B series engines.

The Z79A only were attached to BPTs and MX5s for some reason. All other b series engines, including BP engines got the Z436 attached.

I think the 121 mentioned here is the 70's coupe? (the piston version of the RX-5) When they were a large car. Well before the 121 became known as the small car in later year models.

[project.r.racing]

The Z148A is standard size for a 121 (among many other larger Mazda donks).

Z436 is the standarsd size for most 90s B series engines.

The Z79A only were attached to BPTs and MX5s for some reason. All other b series engines, including BP engines got the Z436 attached.

I think the 121 mentioned here is the 70's coupe? (the piston version of the RX-5) When they were a large car. Well before the 121 became known as the small car in later year models.

haha yeah that makes sense.

[davekmoore]

Thanks for the variety of responses.

There's also room for this one http://www.rycofilters.com.au/catalogue/part/part/Z596 and it has the right thread etc and I don't see any reason (apart from cost) not to put a bigger filter on.

Any gainsayers?

[manga_blue]

Oh my, I'd forgotten about that 121. My Dad had an RX5. Worst Mazda ever.

[manga_blue]

Any gainsayers?

Wrong thread and wrong seal size.

[tbro]

Dave,
If you really want bigger you can use a Z145A, but think about this first,
compare the size of the std MX5 filter and then ask yourself wtf you're trying to achieve????
The Nissan filter would be at least 2 times the size of the Mazda filter, so going by the common but wrong thinking that bigger is always better
then you are either thinking that you can go twice as long between changes or that the paper filtration is better or smaller or whatever.

You have just spent a fortune doing up your engine, so what I suggest is, use a quality oil (your choice) change it regularly,along with the filter and sump plug washer.
If you really want and you're a bit paranoid about your motor, then have your oil tested but don't change it until you're told to by the oil test company.
or
Do what I do (but I have a sponsor who supplies Mobil, Shell, Connoco & Kendal products) Every race or track day, new oil/ filter and sump plug washer. Every 2nd
meeting all oils and fluids, does this work??? when I downloaded after my ƒü¢k up at QR I had gone up to 237C Degrees for 9 seconds before the sensors I think failed, but on strip down, no pick up on pistons, crank oil pump or cams, head was flocked and everything else went in the bin, but the oil had done it job as it prevented the motor from seizing, saving me from locking up half way through turn 3.

As the old saying goes" oil and filter are cheap, motors ain't!!!!

Terry

[davekmoore]

1. Yes, of course I'm paranoid about the motor.

2. Yes, happy to change oil, filter, sump washer regularly and to use top quality of each (see 1 above).

3. Sadly, no sponsor.

4. The existing filter thread is 3/4-16-UNF-2B and there's room for up to 150mm high and 82mm seam width.

5. The relocation kit may or may not have the same thread as an OEM filter, but it does take 3/4-16-UNF-2B. Its placement definitely allows for a bigger than standard filter.

6. Ryco's site lists several filters with the right thread, seam and seal sizes, going even bigger than the one presently fitted.

7. I'm happy to go with a standard sized filter if that's all that's needed, but will also spend the few extra dollars on a larger one if it'll be more effective at filtering or flowing during its short life.

[SuperMazdaKart]

Oh my, I'd forgotten about that 121. My Dad had an RX5. Worst Mazda ever.

Mazda 13B bus? Roadpacer? lol.

Anyway getting back on topic. Might be worth getting the biggest if the filter mount can be rotated so the filter opening is facing towards the top. Keeps the filter full of oil so better for startup pressure, & would make changing filters easier too as less spillage.

[davekmoore]

No rotation is going to be happening.

Is a bigger filter worth having?

[gslender]

No rotation is going to be happening.

Is a bigger filter worth having?

Nothing wrong with a slightly bigger filter. Just don't change the replacement frequency because of it.

[Mr Morlock]

Lets not walk away with the idea that bigger is better. If you have the time to read reams of info on line its not quite all that cut and dried. Simple observation- Z9 filters- big buggers and been on vehicles since at least the 70's. Technology moves on almost everything- phones were once as big as shoe boxes- many cars even with 15,000 service intervals have tiny filters. I read a remarkable statement that the most important part of the filter is the seal because it if fails then goodnight engine- makes me worry!!