Wix Beta ratio numbers?

[jeremiah2360]

Have been looking for an over size filter for an 08 Sentra with the 2.0. The only differences between a Wix 51365(dinky stock,2.577" tall)and a Wix 51356(3.402 " tall)were burst pressure and Beta ratio numbers.

The stock size had a burst pressure of 363 and a beta ratio of 2/20=6/19.

The over size had a burst pressure of 300 and a beta ratio of 2/20=15/22.

What do these numbers mean? Could there be a problem with warranty work if I used the over size one?

Thanks

 

[Gary Allan]

The burst pressures are usually just a byproduct of the can diameter ..but it doesn't appear so in this case. The diameter is the same.

The better filtering, in this case (it's never a given), appears to follow the added length in media (more media of the same grade).

The oversize appears to be a better filter.

Part Number: 51356
UPC Number: 765809513563
Principal Application: Acura (02-08), Chrysler Imports (92-06), Ford Probe (93-97), Honda (01-08), Infiniti/Nissan (96-08), Mazda (71-00), Mercury Villager (99-00), Mitsubishi (90-08), Saturn (04-07), Outboard Marine Engines, Various HD Equip.
All Applications
Style: Spin-On Lube Filter
Service: Lube
Type: Full Flow
Media: Paper
Height: 3.402
Outer Diameter Top: 2.685
Outer Diameter Bottom: Closed
Thread Size: 20X1.5 MM
By-Pass Valve Setting-PSI: 8-11
Anti-Drain Back Valve: Yes
Beta Ratio: 2/20=6/19
Burst Pressure-PSI: 363
Max Flow Rate: 9-11 GPM
Nominal Micron Rating: 19

Gasket Diameters
Number O.D. I.D. Thk.
Attached 2.475 2.173 0.233

Part Number: 51365
UPC Number: 765809513655
Principal Application: Ford (92-97), Honda (00-07), Infiniti/Nissan (95-07), Mazda (97-07), Mercury (91-96), Saab (05-06), Subaru (88-07), Cub Cadet, Yanmar, John Deere, Kawasaki, Kobelco, Outboard Marine Engines
All Applications
Style: Spin-On Lube Filter
Service: Lube
Type: Full Flow
Media: Paper
Height: 2.577
Outer Diameter Top: 2.685
Outer Diameter Bottom: Closed
Thread Size: 20X1.5 MM
By-Pass Valve Setting-PSI: 8-11
Anti-Drain Back Valve: Yes
Beta Ratio: 2/20=15/22
Burst Pressure-PSI: 300
Max Flow Rate: 9-11 GPM
Nominal Micron Rating: 19

Gasket Diameters
Number O.D. I.D. Thk.
Attached 2.475 2.173 0.233

Beta numbers:

2/6
20/19

The "2" is 50% rate. That is, 1 "over" 2 = 1/2 =50% (of the 6um particals)
The 20 is 95%. That is, 19 out of 20 = 19/20 = 95% (of the 19um particles)

Beta#-1/Beta#

 

[Tempest]

Beta ratios explained

 

[jeremiah2360]

Thanks guys! I was still confused though so I called Wix and had them explain it to me and it became clear. The bottom line is that the bigger filter with the same flow rate filters better. A lot better if you ask me.

As explained to me by Wix,

The numbers for the stock size filter 2/20=15/22 mean this filter will have a 50% efficiency at 15 microns and a 95% efficiency at 22 microns.

The over size filter`s numbers,2/20=6/19,mean it will have a 50% efficiency at 6 microns and a 95% efficiency at 19 microns.

That and the fact that the bigger filter is actually a little less expensive for some reason makes this a no brainer!