Importance of Bypass Valve Setting

[Jim Allen]

I'm looking at various filters for my IHC tractor. The Wix application lists a 51768 but some other manufacturer's applications cross over to the Wix 51283, which fits a Porsche application. The mounting is the same for both but the Porsche app is a somewhat larger filter. No Beta is shown but the tractor application showns the nominal micron rating at 25 while the Porsche shows 19. I would go for a larger filter that catches smaller chunks but the big difference in the specs is the bypass setting. The tractor app lists 10-12 psi while the Porsche app is 28-30 psi. Interestingly, the K&N filter (HP-4004) for the Porsche is listed as 8-11 opening and crosses over to the tractor app. Would I be shooting myself in the foot going for the Wix Porsche application?

 

[Ken2]

I'd stick to specs as close to OEM as possible. Don't cross-reference a cross-reference. Always start with your particular engine when looking up various brands of filters. Filter makers often make compromises when recommending a filter for a certain engine, and going from one aftermarket recommendation to another may get you compromises in specs that are too far away from the engine designer's spec.


Ken

 

[unDummy]

OEM specs aren't known.
Because media type and area need to be considered, I wouldn't x-reference between different brands. But, I would x-reference different PN's within a brand(or clone).

Also, the actually definition of the bypass PSI is not defined. Every brand can define the same PSI a different way and get different numbers.

 

[Filter guy]

Use the closest by-pass valve setting to what the engine calls for..or OEM filter is spec'd at.

8-11 or 10-12 will do.

If you go the other route..report back..