Full Flow Filters?
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Also, Full flow filter means that this filter will filter all of the oil that is pumped through the engine, the full flow filter is situated down stream of the oil pump to filter all of the oil that flows through an engine.
Full flow: Is the standard filter that filters the oil on your engine. The "filtered" oil then goes directly to lubricate the engine.
By-pass: Is an add on specialty filter where the oil that goes through this filter "by-passes" lubricating the engine directly and is usually plumbed to return the filtered oil into the oil pan ( or sump).
By-pass: Is an add on specialty filter where the oil that goes through this filter "by-passes" lubricating the engine directly and is usually plumbed to return the filtered oil into the oil pan ( or sump).
A full flow filter is probably the only type of oil filter you have ever seen. The term "full flow" implies that the filter does not restrict the flow of oil through it. Any oil filter that you buy for your car from an Auto Parts or Department store is a full-flow filter.
This is in contrast to a bypass filter, which you really can't buy off-the-shelf. Bypass filters are usually plumbed in parallel to a full flow filter, and are used to significantly reduce the size and amount of particulates in your oil. These are specialty filters - See the Bypass Filter forum.
This is in contrast to a bypass filter, which you really can't buy off-the-shelf. Bypass filters are usually plumbed in parallel to a full flow filter, and are used to significantly reduce the size and amount of particulates in your oil. These are specialty filters - See the Bypass Filter forum.
Thanks for the info, I assummed it was just a standard filter. My owners manual (5.7 Hemi) specifies a "full flow" filter. Thought maybe Dodge was trying to corner the market on filters for the Hemi...kinda like the ATF+4 scenario.
Just joined this forum about a week ago, a hardy thumbs up to everyone involved in providing this
site. Informative and down right entertaining.
I've always enjoyed maintaining my vehicles and using the best products available to do so. Now it looks like I'll be an "oil junkie" for sure.
Just joined this forum about a week ago, a hardy thumbs up to everyone involved in providing this
site. Informative and down right entertaining.
I've always enjoyed maintaining my vehicles and using the best products available to do so. Now it looks like I'll be an "oil junkie" for sure.
Sully: 5.7 hemi..
I'm not sure how much of this is true or a wives tale but the reason Dodge put in the manual back then to use a "full flow" oil filter is because people would race their engines and modify them. In some cases the filter was a weak point and "some" owners would plug the area for racing purposes. Then race their cars, put a filter back on, and claim some warranty and Dodge caught wind of what was going on, then refused warranty because they added you must use a full flow.
I'm not sure how much of this is true or a wives tale but the reason Dodge put in the manual back then to use a "full flow" oil filter is because people would race their engines and modify them. In some cases the filter was a weak point and "some" owners would plug the area for racing purposes. Then race their cars, put a filter back on, and claim some warranty and Dodge caught wind of what was going on, then refused warranty because they added you must use a full flow.
Ray H..
Full flow filters always filter oil...even when the by-pass valve kicks open.
The difference is there is not enough oil flow pressure differential between the dirty side and the clean side of the filter.
Only a totally plugged filter media would not allow any oil to flow. This is extremely rare.
This is the common misnomer about the by-pass relief valve opening up, that only unfiltered oil goes downstream. It does, but it blends with the "cleaned" oil that is getting through the media.
As an example..the Ford valve is set to open at 8-11psi differntial.
You have ( generally) 45psi going into the filter and say under certain conditions 30 psi coming out. That 15 psi differential would open the valve. So you would then have 30psi worth of cleaned oil blending with 15 psi worth of unfiltered oil..
Even at start up the onrushing oil forces some to most of the oil through the media.
As we know when the pressure diffential becomes below the range of the opening of the valve setting, then the relief valve closes. Which happens the majority of the time when your running the car. The relief valve is in it's closed condition.
[ December 04, 2004, 07:22 PM: Message edited by: Filter guy ]
Full flow filters always filter oil...even when the by-pass valve kicks open.
The difference is there is not enough oil flow pressure differential between the dirty side and the clean side of the filter.
Only a totally plugged filter media would not allow any oil to flow. This is extremely rare.
This is the common misnomer about the by-pass relief valve opening up, that only unfiltered oil goes downstream. It does, but it blends with the "cleaned" oil that is getting through the media.
As an example..the Ford valve is set to open at 8-11psi differntial.
You have ( generally) 45psi going into the filter and say under certain conditions 30 psi coming out. That 15 psi differential would open the valve. So you would then have 30psi worth of cleaned oil blending with 15 psi worth of unfiltered oil..
Even at start up the onrushing oil forces some to most of the oil through the media.
As we know when the pressure diffential becomes below the range of the opening of the valve setting, then the relief valve closes. Which happens the majority of the time when your running the car. The relief valve is in it's closed condition.
[ December 04, 2004, 07:22 PM: Message edited by: Filter guy ]
If it recommends a full flow filter, then any filter that fits it is a full flow filter.
A full flow filter design means that all the oil circulating through the engine is directed through the filter. Usually this involves picking it up near the oil pump.
It does not mean all the oil is filtered. Full flow designs include either in the filter or the engine a bypass valve that allows oil to flow directly through the filter bypassing the filter media if the pressure exceeds some limit.
Full-flow oil filters filter ALL the motor oil prior to distribution through the engine's oil galleries - except when they go into bypass mode right after cold starts, during hard acceleration, or once they've gone to a partially or completely clogged state. Simple, huh?
That's the first time I've ever read that - here or elsewhere.
Sounds like you missed some of my posts.
The bypass valve is opened by differential presure across the element, then the bypass valve restricts flow enough to maintain the bypass pressure across the element.
Ray H..
Blame the filter companies. They're not good at explaining the by-pass valve operation. They mainly sell 'em, not have to explain 'em.
lol
But if one stops and thinks..if the valve opens at any point, if no oil was going through the media, how would it ever close?
Blame the filter companies. They're not good at explaining the by-pass valve operation. They mainly sell 'em, not have to explain 'em.
lol
But if one stops and thinks..if the valve opens at any point, if no oil was going through the media, how would it ever close?
Yeah, "Professor" XS650, I must not've been in class at good ol' U of BITOG that day... Everything I've read offsite on the subject indicates that only unfiltered oil exits the oil filter when the bypass valve pops open - the philosophy being that dirty oil is preferable to no oil. Obviously I've been misinformed all these years...
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