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#4558226 - 10/29/17 09:48 AM Fleetguard LF3681 Question
ChesterCopperpot Offline


Registered: 07/08/17
Posts: 18
Loc: West Virginia
Got one of these today and noticed that the "louvres" look almost closed. Does this seem right? Just want to get a consensus to determine if this is ok to use?

Thanks!



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#4558253 - 10/29/17 10:13 AM Re: Fleetguard LF3681 Question [Re: ChesterCopperpot]
CT8 Offline


Registered: 10/09/14
Posts: 10925
Loc: Idaho
Return if in doubt.
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#4558277 - 10/29/17 10:43 AM Re: Fleetguard LF3681 Question [Re: ChesterCopperpot]
92saturnsl2 Offline


Registered: 03/02/04
Posts: 1267
Loc: Flaherty, KY
It's fine. I've seen this on the same China/Korea filter you have pictured, and on Hastings filters. Never had a problem on any of them.
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#4558313 - 10/29/17 11:47 AM Re: Fleetguard LF3681 Question [Re: ChesterCopperpot]
danez_yoda Offline


Registered: 07/18/09
Posts: 462
Loc: texas
Second thought about the louvers. (deleted my first comment)

Has anyone ever added up the surface area of all those slits and calculated the pressure drop across them?

The slits look small but I bet the flow plenty since there are so many of them. Far less restrictive than the filter itself.

The slits should stay clean since the filter will catch anything that would plug them.















Edited by danez_yoda (10/29/17 11:52 AM)

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#4558351 - 10/29/17 12:43 PM Re: Fleetguard LF3681 Question [Re: ChesterCopperpot]
BlueOvalFitter Offline


Registered: 02/28/03
Posts: 6003
Loc: Cajun Country, La.
It's fine. Use it!

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#4558490 - 10/29/17 03:25 PM Re: Fleetguard LF3681 Question [Re: ChesterCopperpot]
ZeeOSix Offline


Registered: 07/22/10
Posts: 17764
Loc: PNW
Too closed up for my taste. Seen many examples of well formed louvers much wider opened than these.

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#4558544 - 10/29/17 04:38 PM Re: Fleetguard LF3681 Question [Re: ChesterCopperpot]
JohnnyJohnson Offline


Registered: 10/22/09
Posts: 2731
Loc: Wet side WA
Some people seem very upset with the louvres vs nice round holes. But what's the flow rate and is there really any significant restriction of flow since there seem to be many more of them?


Edited by JohnnyJohnson (10/29/17 04:38 PM)
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#4558598 - 10/29/17 05:45 PM Re: Fleetguard LF3681 Question [Re: ChesterCopperpot]
WellOiled Offline


Registered: 10/03/15
Posts: 1356
Loc: Houston, Texas
I have always liked the idea of louvres. However, I have seen better formed louvres than what is posted here. I would want a little more opening. Thanks for the post.
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#4558635 - 10/29/17 06:24 PM Re: Fleetguard LF3681 Question [Re: ChesterCopperpot]
Peter_480 Offline


Registered: 07/03/17
Posts: 122
Loc: New England
Purolator OEM?
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#4558655 - 10/29/17 06:51 PM Re: Fleetguard LF3681 Question [Re: Peter_480]
ChesterCopperpot Offline


Registered: 07/08/17
Posts: 18
Loc: West Virginia
I don't think its Puralator. It says "Made in Mexico" which was somewhat disappointing. It doesn't have the traditional date code to indicate Puralator.

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#4558973 - 10/30/17 06:48 AM Re: Fleetguard LF3681 Question [Re: ChesterCopperpot]
Sayjac Offline


Registered: 10/13/08
Posts: 12248
Loc: The Old North State
Not aware who makes this FG, but overall construction pics, coo, and non Puro date code would indicate not Puro made. Recently another FG posted was made by Champ Labs. Don't think that's the case here though either.

As for louvers, your call. Seen more open ones, however also seen ones that didn't look open down the center tube and once media removed showed plenty of total opening area.

I'd say if in doubt or bothers you, take it back, use something else.

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#4559077 - 10/30/17 08:56 AM Re: Fleetguard LF3681 Question [Re: ChesterCopperpot]
goodtimes Offline


Registered: 12/08/10
Posts: 2846
Loc: california
There is another set of holes facing the other way. I cut open a Delco I was uncomfortable with, about like these louvers, and it was actually fine. Probably it is a judgement call. Here is a filter cut open that shows the narrow gap between can and element in the first two pictures. By eye the gap probably looks too small. When calculated it should be fine.

https://bobistheoilguy.com/forums/ubbthreads.php/topics/4555425/Fram_Ultra_XG7317_-_12,049_mil#Post4555425

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#4559101 - 10/30/17 09:21 AM Re: Fleetguard LF3681 Question [Re: ChesterCopperpot]
beanoil Offline


Registered: 10/17/04
Posts: 2951
Loc: Midwest, Illinois
There is nothing wrong with that filter. I see about 60 visible louvers, give or take in pic1. A little less than 1/2 of the tube visible, so what, over 200 slits in the top half alone? Ever see how much fluid can escape a pinhole with 60 pounds of pressure on it?
I'm always surprised when folks question a leading filter manufacturer like FleetGuard. if there was a genereal problem with louvered center tubes, engines would by dying every day, all across the nation.
The Donaldson on my PSD has the same construction. I'm good with it.
_________________________
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#4559699 - 10/30/17 09:11 PM Re: Fleetguard LF3681 Question [Re: ChesterCopperpot]
DoubleWasp Offline


Registered: 05/21/12
Posts: 5236
Loc: Fort Lauderdale, FL
I had the same doubt about a Purolator Boss center tube, but when I poured oil through it, it went through like a sieve. Under pressure, it would have been a deluge through it.
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#4561572 - 11/01/17 08:26 PM Re: Fleetguard LF3681 Question [Re: beanoil]
ChesterCopperpot Offline


Registered: 07/08/17
Posts: 18
Loc: West Virginia
"beanoil", thanks for the input and advice. I'm not sure why your surprised when folks question things. This website/forum is full of questions about various topics. I'm sure its in the interest of gaining knowledge.

BTW, the "leading filter manufacturer like "FleetGuard" can't even validate the correct oil filter for my application. They keep telling me to use a different oil filter that clearly based on specifications will not work for my vehicle. I have provided all the data required within reason. Glad I questioned them....

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