Quote:
Originally Posted by JohnMcD348
I'm still fairly new to all this but I would think the size of the filter really wouldn't do anything for you except allow a slightly larger amount of oil to be in your engine lubrication system at any given time.
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It's okay that you aren't sure of the benefits, you came to the right place for info! I work for the company that sells filter media to Honeywell(Fram). If you increase the size of the filter, the area of the filter media increases. The oil pump can only output a specific amount at a given rpm, that doesn't change. What does change is the differential pressure against the filter. At a given pressure and area of media, There will be a certain face velocity, or speed at which the oil hits the filter. If you increase the area of the media, while all the rest of the system stays the same, the face velocity decreases.
This has several benefits. First, a lower face velocity means better filtration, the particulate matter hitting the filter is moving slower, and has a greater likelihood of being captured. Secondly, a larger surface area decreases the back pressure on the oil pump with cold oil, due to cold oil having a high viscosity compared to warm oil. Lastly, though not the last benefit, the larger surface area means a greater capacity, so the life of the filter increases.
Quote:
Originally Posted by JohnMcD348
Say, for example you use a Fram oil filter, no matter what size it is, they all use the same basic filter media. The only difference that the size makes is the volume of oil it holds.
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It depends on the line of filter, but I think I know what you're saying. The Fram Tough guard is tighter filter media than the standard media. The Fram Xtended guard is far superior in construction (metal end caps, expanded metal backing, dual-layer synthetic media, I know, I helped design it
, though Honeywell has dropped the ball in the marketing department and doesn't advertise for squat - but that is another thread.) and has MUCH high capacity than the other media in the Fram lineup. So, if you pick up a regular Fram filter and then get a larger sized tough guard filter, the back pressure is probably going to be similar, due to the tightness of the Tough guard, but you will have a larger area and smaller pores (better filtration). I hope that clarifies the subject. Just ask if you have any more questions. I love this stuff, because it's what I do everyday!
