High RPM high flow filter?

[Camprunner]

Im going to be towing my 5,000lb camper with my V6 4runner this summer for many miles and I was wondering if I should get a filter with a higher than normal flow rate as I will be working my V6 real hard on lonng hills?

I think I was reading on this site some time ago that the K&N filter has a real good flow rate??

 

[Gary Allan]

No need to worry. Flow potential is only realized during transitions where the oil pump relief is open. These would be where you are at peak oil pressure. Assuming a sound engine (everything working the way it should) a filter should never effect flow except in very specific (and mostly marginal) conditions.

Now if you're starting @ -40 ..or flat shifting @ 7500 rpm...or doing either with a high volume oil pump with too heavy an oil...

otherwise, while towing your oil temps should keep your viscosity low enough to never reach your relief limit to attenuate pumping.

 

[boxcartommie22]

use a stainless steel mesh filter for 57gpm @ 1 psi with a 90wt oil/1 sq inch and absolute filtering at 30u....i been using these stainless steel filters now in all my vehichles for 1.5 yrs. now easy to clean too. we use these at the track...k&p engineering is a great company sell these filters for all types.auto trucks motorcycles etc. they will free up alot of motor drag and give you about 4-6 extra horsepower...there is no paper filter on the market that will flow at high flow rates at the 1psid.

 

[Gary Allan]

Those stats are good. Heck, a decent paper filter will have (pulling a number out of my behind- but good enough for this demonstration) 10 PSID @ 10 gpm (with some visc fluid). But seeing that most passenger car engines can't process 5gpm except at the upper end of their rpm range ..the figure really doesn't mean much to too many (except in very obscure marginal or exceptional circumstances). That is, you'll typically be WAY into your oil pump's relief setting WAY before you'll ever develop that level of PSID due to natural media resistance to flow.

The engine and the filter are a series circuit if the oil pump is not in relief. The filter must fall into a proportional relationship to the engine's resistance to flow (as expressed in terms of pressure).

 

[widman]

The stainless filters I've read about have about a 35 micron nominal rating, compared to 15 to 25 in paper filters. Even if you had better flow, you are causing more wear.

 

[boxcartommie22]

don't for get about paper swelling to more then 300 u of particles that get by those cheap paper filters!! even hot oil swells paper......

 

[Steve S]

Originally Posted By: boxcartommie22
don't for get about paper swelling to more then 300 u of particles that get by those cheap paper filters!! even hot oil swells paper......
The paper is coated with resin.