Motorcraft FL-400s
#11
JK Super Freak
Thread Starter
This engine is set up for longevity by Chrysler and is designed to have 6 quarts of oil in a full pan. The longer oil filter will filter more oil , but not more effectively, if the filter wasn't changed for a couple of years it MIGHT clog up. The main practical benefit of a larger filter is increased oil capacity, which adds to Chryslers initial engine setup of an extra large oil pan. Obviously 5 quarts would lube this engine quite effectively, the reason for the 6 quarts is heat transfer. This is just as important as the oil lubricating qualities, in fact the oil will break down and cause engine failure if overheated. So a larger filter won't give you any cleaner oil ( practically speaking) but it will fit right in with the setup scenario for this engine oil system. The size of an oil filter will not affect oil pressure, The oil pump, which is made up of enclosed gears driving the oil thru the engine passageways thru the bearings relys on bearing clearances to maintain oil pressure. To the oil traveling thru the engine the filter presents itself as a larger passageway with more oil volume. If the drainback valve has done it's job and kept the filter full, then there is NO effect on oil pressure. Actually your oil filter could be 5 gallon bucket sized! If the oil volume is sufficient, the engine oil system wouldn't know the difference.
#12
JK Enthusiast
This engine is set up for longevity by Chrysler and is designed to have 6 quarts of oil in a full pan. The longer oil filter will filter more oil , but not more effectively, if the filter wasn't changed for a couple of years it MIGHT clog up. The main practical benefit of a larger filter is increased oil capacity, which adds to Chryslers initial engine setup of an extra large oil pan. Obviously 5 quarts would lube this engine quite effectively, the reason for the 6 quarts is heat transfer. This is just as important as the oil lubricating qualities, in fact the oil will break down and cause engine failure if overheated. So a larger filter won't give you any cleaner oil ( practically speaking) but it will fit right in with the setup scenario for this engine oil system. The size of an oil filter will not affect oil pressure, The oil pump, which is made up of enclosed gears driving the oil thru the engine passageways thru the bearings relys on bearing clearances to maintain oil pressure. To the oil traveling thru the engine the filter presents itself as a larger passageway with more oil volume. If the drainback valve has done it's job and kept the filter full, then there is NO effect on oil pressure. Actually your oil filter could be 5 gallon bucket sized! If the oil volume is sufficient, the engine oil system wouldn't know the difference.
Why?
Because "To the oil traveling thru the engine the filter presents itself as a larger passageway with more oil volume." ?
You're suggesting that a smaller volume filter; filters less? Hmmm.
#13
JK Super Freak
Join Date: Jun 2007
Location: North East Kingdom, Vermont
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"So a larger filter won't give you any cleaner oil ( practically speaking) but it will fit right in with the setup scenario for this engine oil system."
Why?
Because "To the oil traveling thru the engine the filter presents itself as a larger passageway with more oil volume." ?
You're suggesting that a smaller volume filter; filters less? Hmmm.
Why?
Because "To the oil traveling thru the engine the filter presents itself as a larger passageway with more oil volume." ?
You're suggesting that a smaller volume filter; filters less? Hmmm.
So if you have 3 filters, and the filtering elements all have the same restriction, and all stay filled with oil, a mopar, a motor craft, and a 5 gallon bucket; you have oil flowing into them under 20lbs pressure, the volume of oil going into the engine will be the same from all of them, but the bigger one will be able to keep that same flow, at the same pressure for a longer time.
Then, he is adding, a larger total volume of oil, in the engine, will tend to stay a little cooler, just as an added benefit.
or not.
#14
JK Junkie
You should be more concerned about the quality of the ADBV (Anti Drain Back Valve) if that doesn't work properly you can end up with ten times more damage to your engine than the filter not filtering very well could ever cause.
Last edited by whpony96; 10-31-2008 at 05:01 AM.
#15
JK Super Freak
Thread Starter
Last edited by cmpmacchia; 11-01-2008 at 03:20 PM.
#16
JK Junkie
"So a larger filter won't give you any cleaner oil ( practically speaking) but it will fit right in with the setup scenario for this engine oil system."
Why?
Because "To the oil traveling thru the engine the filter presents itself as a larger passageway with more oil volume." ?
You're suggesting that a smaller volume filter; filters less? Hmmm.
Why?
Because "To the oil traveling thru the engine the filter presents itself as a larger passageway with more oil volume." ?
You're suggesting that a smaller volume filter; filters less? Hmmm.
#17
JK Enthusiast
Gosh I knew I'd get flamed on this oneWhether a filter holds 8 oz of oil or 16oz it filters oil, the size doesn't matter.The oil is pushed thru the passageways by the pump, a bigger filter doesn't draw any more oil, the pump will only move the volume it was designed to pump. If the filter and passageways are full then the size of the filter doesn't matter, only ''x'' number of ounces will be pushed by the pump anyway. Whether 8 oz are filtered thru 32 square inches of filter media or 8 oz are filtered thru 64 square inches of filter media- you still only have 8 oz of oil filtered. When I said setup scenario I meant the engine running an above average volume of oil, a larger filter would be right in line with this.....
The mopar would seem to be more about one size fits all; hence the bigger sizing?
I'm just banging on about this because i'm wondering if i really need a larger filter than the one i'm using and intend to continue using..
#18
JK Junkie
No flaming from here. But.. heh. I think your larger filter setup is some guess work on your part? Especially since when you lookup the sizing for the filter it comes up with the standard sizing from some of the filter producers like Fram.
The mopar would seem to be more about one size fits all; hence the bigger sizing?
I'm just banging on about this because i'm wondering if i really need a larger filter than the one i'm using and intend to continue using..
The mopar would seem to be more about one size fits all; hence the bigger sizing?
I'm just banging on about this because i'm wondering if i really need a larger filter than the one i'm using and intend to continue using..
#19
Just purchased a Motorcraft FL-400s for the Jeep. The filter is twice the length of the Fram. Hopefully the ADBV work on them as well as the Fram did. Do you get better filtration with a filter thats double the size in length, assuming the filter media are relatively the same.
#20
JK Super Freak
Thread Starter