Reasons to use a larger filter?

[ZeeOSix]

Originally Posted By: Jim Allen
Filter efficiency is directly and primarily controlled by the media, but not the amount of media. The velocity of flow has a small effect on it and my recollection of the primary material I read about it years back was that lower velocity tended to nudge the efficieny up. As I recall, it was by a negligible amount but I am not standing on my memory about that.


When comparing the same media, more media area with a constant flow means less flow velocity through the media, which means less delta-p. I can see efficiency going up a bit due to the media's ability to hold captured particles better with less delta-p trying to dislodge those trapped particles. Kind of goes back to the Purolator/Mann+Hummel graph showing the efficiency slowly dropping with increased filter loading.

 

[Garak]

Originally Posted By: dlundblad
I thought to a degree, a larger filter decreased efficiency?

To expand on what Jim Allen said, that may be with different media being used in the two different examples. I have seen some examples in both directions, where an oversize was more efficient or less efficient, which was a little easier to see before Wix, for example, whitewashed their data.

 

[Linctex]

Originally Posted By: Jim Allen
The velocity of flow has a small effect on it and my recollection of the primary material I read about it years back was that lower velocity tended to nudge the efficiency up. As I recall, it was by a negligible amount but I am not standing on my memory about that.


Yes, I read it also, but can't recall.

 

[Linctex]

I seem to recall it was during a discussion of "Pleated versus Depth" bypass filters, Maybe ol' Ralph Wood was on his soapbox like he usually did.....

It is true, though...
the slower the flow through the pleated media, the better it is at trapping "stuff".
I think that is "HOW" most pleated bypass oil filters work (Including Amsoil).

 

[David1]

Originally Posted By: JLTD
IMO not really. A larger filter holds a little more, and slightly increases the volume of oil in the sump. Neither is really necessary when the oil and filter are changed at reasonable intervals.


Some people say a smaller filter is gives more OIL pressure like the HAMP Synergy for Honda.. They claim is gives extra oil pressure for its VTECH..

So I guess there is a trade off. ???

 

[ZeeOSix]

Originally Posted By: David1
Originally Posted By: JLTD
IMO not really. A larger filter holds a little more, and slightly increases the volume of oil in the sump. Neither is really necessary when the oil and filter are changed at reasonable intervals.


Some people say a smaller filter is gives more OIL pressure like the HAMP Synergy for Honda.. They claim is gives extra oil pressure for its VTECH..

So I guess there is a trade off. ???


How can a smaller oil filter give higher oil pressure if the pressure sensor is located after the filter? I'd like to see the back-up data on that one.

 

[Yah-Tah-Hey]

None

 

[David1]

Originally Posted By: ZeeOSix
Originally Posted By: David1
Originally Posted By: JLTD
IMO not really. A larger filter holds a little more, and slightly increases the volume of oil in the sump. Neither is really necessary when the oil and filter are changed at reasonable intervals.


Some people say a smaller filter is gives more OIL pressure like the HAMP Synergy for Honda.. They claim is gives extra oil pressure for its VTECH..

So I guess there is a trade off. ???


How can a smaller oil filter give higher oil pressure if the pressure sensor is located after the filter? I'd like to see the back-up data on that one.




Description: HAMP filters are designed to keep a more constant Oil Pressure, and raises oil pressure by about 5 psi. If you know JDM then you know this product needs no introduction. HAMP is Honda's Japanese aftermarket product "HAMP Synergy". The HAMP Synergy are set up after the Honda original parts products. These can be used on any Honda, but are specifically designed with Type Rs, and Type Ss in mind. Features to this item include a unique release valve that dynamically adjusts to the conditions within the filter to keep the flow and pressure constant. The HAMP oil filter will last longer and filter better than any other filter on the market. An item that is a definite must have for any B series or K series high performance high revving VTEC/iVTEC motors.





Hamp Synergy oil filters (a JDM product) are advertised as being superior to oem Honda (allegedly manufactured by Fram for the US market) oil filters, by virtue of (supposedly) "providing better screening as well as higher and more consistent oil pressure." I have also seen these oil filters described as being either the "large" filter or the "small" filter, with the smaller one supposedly providing "higher and more consistent oil pressure which is ideal for race purposes".