Looking for a high flow oil filter for my rotary..

[byez]

I will be driving this Mazda RX8 occasionally in this cold Alberta winter.

What would be a good oil filter that will handle 9000 rpm's and still filter well?

I am considering using Amsoil EAO or K&N through two intervals of 5000km. Would the K&N hold up to 10,000km? Would anyone advise against this?

(note: km not miles)

 

[Gary Allan]

Do you hit your peak (cold) oil pressure at your (hot) 9000 rpms? If yes, go with a K&N only by reputation. If not, then buy whatever you want. An EaO would be a good choice.

Oil filter flow capability is identical if you're below your oil pump relief setting. If you're above it, your oil filter's bypass valve limits the resistance of the filter. The filter's inherent resistance may come into play if you're at some screaming volume through it, but that would also tend to peak the oil pressure beyond the relief limit of the pump and make it a moot point.

 

[Steve S]

First of all drive the car untill the oil warms up before you put the pedal to the metal ther shouldn't be any filter problem. Marketing works so well.

 

[Gary Allan]

He's in Canada. He's got very few "cheap" choices on upper tier filters. He's going to be putting out $15-$18 for everything from a PureOne to an EaO. His most available filter is Fram.


..but I don't disagree (mostly) with your statement.

 

[Steve S]

What is the oil pressure and the flow of the oil pump? most likley any oil filter will go into bypass untill the the pressure equalizes on both sides of the filter if at all. But how long can the engine be at 9,000 rpm ? The amount of time the oil filter would be at bypass would not matter . There is a reason the filter or oil filter housing has a bypass. What filter did Mazda put on the engine from the factory?

 

[TallPaul]

Higher flow usually means more open pores. A larger filter might help flow. But perhaps a synthetic filter media would acheive the desired high flow and still maintain good filtration. Fleetguard had a synthetic media for the Ford FL1A application and their oversized (extra long filter) with standard media for that app (LF 697) had a very high flow rate, almost 16 gallons per minute. I say had because my research is a couple years old now.

 

[Gary Allan]

Well, yes, TallPaul ..but most engines would be hard pressed to push 5gpm (Euro's and exotics excluded). Hence any static PSID rating is pretty much meaningless. In addition, regardless of that rating, the PSID is going to be dictated mainly be the "time in pump relief". Once you have unity of flow (out of relief) the filter tends to disappear from the equation ...until you reach those stratospheric flow rates ...which also tends to put you in pump relief. It would be an extremely rare engine to push 10gpm (aforementioned exotics exempt).

 

[byez]

Gary is right on regarding filter selection in Canada. Anyone want to trade some filters for Esso XD3?

Off the top of my head for good filters there is the Amsoil EAO $20, K&N $12, and Napa Gold $6.

FRAM is everywhere from the big chain stores to the smaller auto supply shops.

The question is, will Napa Gold at each oil change filter better than a 2X interval of either the EAO or K&N? Will the EAO or K&N work more efficiently at trapping particles as they age?