Do filters mounted straight up and down....
- Thread starter Chris B.
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Patman
Staff member
It is needed to keep oil that is directly above the filter for faster oil flow on startup. So even with a vertical mount, the antidrainback valve is a good thing to have.
You'll notice this most when you change the oil filter on a vertical mount filter with an ADBV, because tons of oil comes spilling out, which all came from above the filter in the passages. But if that filter had no ADBV, you would hardly see any oil spill out when you change it.
You'll notice this most when you change the oil filter on a vertical mount filter with an ADBV, because tons of oil comes spilling out, which all came from above the filter in the passages. But if that filter had no ADBV, you would hardly see any oil spill out when you change it.
Patman
Staff member
Yep, the LS1 oil change can be very messy! I remember a lot of guys used to recommend punching a hole in the oil filter before removal, but this won't do anything since so much oil is still trapped above the filter because of the ADBV.
So this is a way to see if your ADBV has failed or not. If you don't get that huge pile of oil spill out, then the valve was not working.
Perhaps I'm wrong, but it seems to me that if a vertically mounted filter (hanging straight down)is full of oil--- oil would still be "trapped" on top of it, ADBV or not. I mean, if the filter is full, where is the oil going to go that it wouldn't go with an anti-drainback valve?
I've always been of the opinion that the anti drainback valves were redundant on engines where the filter was mounted the "right" way.
Again, I may be wrong, so someone explain it to me!
Jason
I've always been of the opinion that the anti drainback valves were redundant on engines where the filter was mounted the "right" way.
Again, I may be wrong, so someone explain it to me!
Jason
The oil will not stay up there without the valve. Garvilty will pull the oil down to the lowest point.
Since the oil pan is a larger container I would think that all the rest of the oil would flow there if you don't have the anti-drain back valve. Plus the bottom of the pan sits lower than the filter anyway.
I have a couple of V-8 Chevies and I know what you guys are talking about. I guess the filters that I buy have the valve. What a mess!
I have a couple of V-8 Chevies and I know what you guys are talking about. I guess the filters that I buy have the valve. What a mess!
Do this:
Go to pet store and buy 5 ft aquarium tubing and check valve. Go home. Find volunteer.
Sit on floor with full glass(sump) of water balanced on head.
Install check valve(ADBV) in tube and fill it with water.
Have volunteer hold tube over the glass of water(which is on your head). You're still dry!
Have them remove the check valve(like certain cheapo filters that are ADBVless).
You'll understand that mounting location is irrelevant when there are oil passages which hold oil at a height over the filter.
[ June 26, 2003, 09:00 PM: Message edited by: unDummy ]
Go to pet store and buy 5 ft aquarium tubing and check valve. Go home. Find volunteer.
Sit on floor with full glass(sump) of water balanced on head.
Install check valve(ADBV) in tube and fill it with water.
Have volunteer hold tube over the glass of water(which is on your head). You're still dry!
Have them remove the check valve(like certain cheapo filters that are ADBVless).
You'll understand that mounting location is irrelevant when there are oil passages which hold oil at a height over the filter.
[ June 26, 2003, 09:00 PM: Message edited by: unDummy ]
The oil above the filter will push the oil back to the oil sump if there is not an ADBV. All the fluid wants to be at an equal potential energy level. If its above the filter and the sump, then it has higher energy than the oil in the sump. It will return there by flowing backwards through the filter to get there.
With the ADBV, it holds the oil in the higher places in the engine - unless it drains to the sump after flowing through the engine instead of the filter first!
With the ADBV, it holds the oil in the higher places in the engine - unless it drains to the sump after flowing through the engine instead of the filter first!
After thinking about this for a couple of hours, I can see that the ADBV might help keep the oil that is above the filter from flowing back THROUGH the filter and into the pan. At least on an older style small block Chevy, I'm looking at a lubrication diagram and I'd have to say that this amount of oil would be pretty insignificant. Perhaps on an LS1, with the oil pump above the level of the filter... yeah, I can see that. Sorry for the confusion.
BTW, does a PF44 have an ADBV? I have a Z28, and I've not noticed an unusual amount of oil trapped above the filter. Oil pressure is practically instantaneous at start-up, though.
Jason
BTW, does a PF44 have an ADBV? I have a Z28, and I've not noticed an unusual amount of oil trapped above the filter. Oil pressure is practically instantaneous at start-up, though.
Jason
Sorry, no scanner or I'd post this lubrication diagram.
Jason
Jason
Yep the PF44 and equivalents have the ADBV. I believe the PF58 does not while the PF59 which is the same as the PF58 except it does have the ADBV. I use the longer PF59 on my SS only I use a Wix 51522 and when I loosen the filter it drains for a good 2 mins before I can take the oil filter down w/o making a gawdawful mess
A liguid is going flow down to the lowest level. Having the filter full of oil has nothing to do with it. After the car sits, all of the oil will reach the same level. A ADBV stops the flow downward from the upper oil galleries. This helps quite valve train noise at start up.
[ June 27, 2003, 08:54 AM: Message edited by: Mike ]
[ June 27, 2003, 08:54 AM: Message edited by: Mike ]
Here's a drawing. It's the best I can do in a hurry.
http://img.villagephotos.com/p/2003-6/188982/Drawing1.jpg
[ June 27, 2003, 09:03 AM: Message edited by: satterfi ]
http://img.villagephotos.com/p/2003-6/188982/Drawing1.jpg
[ June 27, 2003, 09:03 AM: Message edited by: satterfi ]
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