huh?? Since the V1 spec pump pressure is 50.8psi which well exceeds the bypass for either filter (17.1psi V1 vs. 26.1psi V2), why wouldn't there be enough pressure?

That's simply doesn't make any sense....

 

hmm

I read it wrong I think, my bad.

 

It's pretty simple to me.

If the old filter would have worked well for the '09, that's the one Mazda would have used.

If the new filter will work for the old car, Mazda will eventually cross-reference the part number and save their dealers the cost of inventorying both filters.

The risk in using the proper factory (or aftermarket) filter on your car is zero.

Use the wrong filter and Mazda may not honor their 100,000 mile engine warranty on your car.

Trying to second guess the mechanical engineers that selected the filters for each of these applications is a waste of time.

 

it's not the exact numbers that matter, it's the size of the difference. In a measurement such as oil pressure bypass a large percentage change is important because bypasses are only used for specific situations. In the old motor, at 17.1 psi, the motor expects this bypass to occur in specific situations at specific times. Now if you increase that pressure roughly 50% that means you're adding 50% across all factors in the bypass "equation".

So the motor "expects" (it has no knowledge but the designers themselves while building the motor build things "in" in certain ways "expecting" certain things, so i say the "motor expects" meaning that) this bypass at 17.1psi and at that time certain things are occurring. You now are hindering the motor by preventing bypass until 26.1 psi because it "expects" the flow to stay good even during the bypass situation, but with no bypass the flow could be hindered.

i'm sure i used some terms improperly in that description, it's more of a "full effect" writing i tried to explain certain key factors, my apologies if wording is off, in advance.

kevin.

 

B6Y1-14-3029A......... Mazda 2, Mazda 3 (1600cc), FD RX-7, FE S1 RX-8, MX-5 NA-NB, Mazda 626 and MX-6 (2000CC).
JEY0-14-3029A.......... Mazda 6 V6.(94) Mazda 6 (91).
N3R1-14-302............. FE S2 RX-8.
YF09-14-302A............ Mazda CX-9
L321-14-3029U.......... Mazda CX-7, Mazdaspeed 3&6, Mazda 6 (2500cc), Tribute.
LF10-14-302.............. Mazda MX-5 NC, Mazda 3 (2000cc), Tribute.
WLY4-14-302............. Mazda BT-50.

Those filters with 9 on the end of the Part Number are not Genuine (Factory) but manufactured by another company that is approved in design by MNAO and MMC.

 

I dont think their name worth that extra 10 bux (cuz to me, oil filter worth about 5 bux thats about it, I wont even buy K&N filters alone, I got it because it was part of the oil change bundle deal, which makes it around 6-7 bux)

and when I Saw that "49.95 Royal Purple Oil change special", my heart almost stopped ...



Hmm Anywayz, is there any way to tell the spec of an oil filter? I know OEM filter does have a spec. but most aftermarket filters don't, for example. RP filters

http://www.royalpurple.com/rp-oil-filter.html

description looks good, but no word about spec on its site. To get info, you have to CALL their Filter hot line. hmm. I should try to call tomorrow.

WiX filter has its spec out.

http://www.wixfilters.com/filterlook...asp?Part=51365

Bypass Valve set at 9-11 psi. is it too low? correct me if wrong.

Update : Found Fram's spec

Relievf Valve (bypass valve?) opens at 13 psi. Extra, Tough, and Double Guard. All got the same spec.

http://www.power-21.com/FramPower21i...?b=F&pn=PH6607
http://www.power-21.com/FramPower21i...?b=F&pn=TG6607
http://www.power-21.com/FramPower21i...?b=F&pn=DG6607

Another Update : Found Purolator's spec

http://www.purolatorautofilters.net/...artnum=PL14612
http://www.purolatorautofilters.net/...partnum=L14612

both opens at 14-18

 

Here is some info on filters...

What is the by-pass valve?
Should the oil filter become blocked, the valve will open allowing oil to flow into the engine. (Unfiltered oil is better than no oil).

What is the difference between a full flow and a bypass oil filter?
Full flow is where 100% of the oil passing through the same media before entering the engine. Bypass filters are more restrictive and take a portion of the oil and filter out smaller particles that can or have passed through the full flow filter.
Common in heavy duty applications. Some filters can be a combination of full flow and bypass in a single canister, like Toyota Landcruiser (4WD)

What is over pressurisation?
When the oil pressure valve temporarily sticks, it subjects the entire lubricating system to extreme pressures. Under these conditions the oil filter generally expands as the increased pressure tries to force the filter off the engine. Our filters are built to withstand 3 times normal operating pressure.

What is an anti drain back valve?
It stops oil from draining out of filter and oil galleries when the engine is shut down and aids quick flow of oil to engine on start up. Not all filters require anti drain back valve due to the construction of the engine.

What is micron rating?
A measure of the pore size in the filter media. Expressed as either ‘Nominal’ or ‘Absolute’. Nominal Rating relates to the percentage of particles at a given size that a filter can capture ie. 10 microns at 90% means it will remove 90% of particles 10 microns in size. Absolute refers to the removal of all particles at a given micron size and larger ie. 20 micron absolute means 100% of particles 20 microns or greater will be captured.

The lower the micron rating, the greater the efficiency and hence the amount of dirt that is captured.

Common oil filter micron rating is approximately 30. (Human hair is approximately 70 microns)

When comparing different filter brands micron rating, you need to make sure that the same test procedures have been followed


What is filter life?
How long a filter lasts before clogging up. Dust-holding capacity of the filter determines how long its life is. The more high-quality paper inside the filter the more dirt it will hold and the longer it will last.

Does more pleated media filter paper mean better filtration?
Generally a filter with more media has the ability to trap more contaminants than one with less. Few pleats means little media and low capacity. Irrespective, the media must contain the appropriate resins and compounds.

What is media?
Media is a mixture of various fibres bonded together.

The 'media' paper filters out the contaminants passing through the oil, air or fuel filter. Quality and quantity of media are very important. Some media may look similar but can perform differently. The function of filter media is to remove the greatest amount of contaminants while offering the least resistance to flow.

THIS ONE IS INTERESTING

Why do Engineers start with Air filter requirements first?
Because it is the most important filter. Unfiltered air (inducted contamination) will cause excessive engine wear


http://www.rycofilters.com.au/products/faqs

 

This information above is from an Australian manufacturer of Filters "RYCO" they are well regarded and of a good quality.

Not being a "Certified Mechanic", I was always under the impression that a "By Pass Valve" was there in an oil filter for when the filter became Blocked, it serves no other purpose, it appears this is confirmed by Ryco?

Keep in mind that the RX-8 Oil filter is a Full Flow Type, and again the meaning is above.

So I take this as being ALL the oil is filtered by a Full Flow Type Oil Filter (see Mazda's Service Highlight 2009 RX-8, I am sure ALL Mazda Oil Filters are Full Flow Types), and it is not by-passed unless the filter is blocked.

I often wonder why Mazda don't specify "Anti- Drain Back Valves" from their OEM oil filter makers...is it Cost?...it is an *** when you get oil going everywhere when you remove the filter because there is no valve!.

 

I usually let my filter sit at least 30 minutes or so before I do any oil change. That way most oil would go back down to the pan.

Why no Anti drain back valve? maybe we dont need one ? :P

 

The N3R1-14-302 is 09 RX8 only at this time in terms of it's listing from Mazda and they warn not to use the prior N3H1 on an 09. The term used is "Not interchangeable".

Paul.

 

pointy tipped chisel and hammer, bam, instant "drain valve", allows oil to drain out into engine.

kevin.

 

I'm not privvy to that data (are you?). I'm content that the Mazda RX-8 engineers had a good reason for spec'ing a particular form/fit/differential pressure/media type for the specific application. But use whatever you like.

Now, having said that, I know there's a somewhat political reason for recommending (but not requiring) 5w-20 oil, so I do run 5w-30. But I see no such overtones for the filter.

 

But remember to loosen the filter a bit prior. One would hate to ruin the oil filter only to discover they couldn't remove it right away.

 

Even Full Flow Type filters can't filter all the time, even in normal use with an unclogged filter. See my post a ways up, beyond clogged filter, cold oil and high revs increasing pressure, e.g., and therefore activate the bypass.

 

You are lucky, my o9 is almost upside down, so oil cant drain out...

 

BUTCHER!

 

Ryco a famous (here) manufacturer must be wrong about full flow filters.

When you start your 8 from cold put your hand on the oil filter body, within about 20 seconds it starts to get warm-hot...very quickly.

 

loosen, but then re-snug, don't wanna hammer on loose threads at the pedestal.

kevin.