Larger Engine Oil Filter

[Ernest Dankert]

Reason's (in my world) to use a larger filter.
1) More filter media to limit time on bypass during cold start.
2) More filter media to trap grit getting through air filter.
3) More oil volume for extra additive and resulting contaminant dilution.
--
1977 Eleganza II
Ogden NY

 

[Bob Dunahugh]

Ernest has that right as to a larger filter. As I recall the Olds oil filter that was listed years ago were larger. Bob Dunahugh

________________________________
From: Bob Dunahugh
Sent: Friday, June 16, 2017 11:46 PM
To: gmclist
Subject: RE:Larger Engine Oil Filter

The original filters of yesterday for the Olds were longer as I recall. Then the filters got shortened. So this is that longer filter of the pass. Perfect fit, and no hazard of getting hit.

Bob Dunahugh 78 Royale

 

[robert mueller]

NOTHING!

Regards,
Rob M.
The Pedantic Mechanic
USAussie - Downunder
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
USA '77 Kingsley - TZE 267V100808

-----Original Message-----
From: Gmclist [mailto:gmclist-bounces] On Behalf Of Joe
williams
Sent: Monday, June 19, 2017 1:05 AM
To: gmclist
Subject: Re: [GMCnet] Larger Engine Oil Filter

OK ,I'm still confused - I was just on the GMCMI parts exchange again and it
has a completely different list of oil filters for the 1978 403 vs all
455 and the 77 403. what would be different about the 78 403 that it would
need a different filter.
--
jwilly

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[john r. lebetski]

It think it's like this. The big block and small block take a different recommended filter. Then ,there is also a longer version of each of those for
HD service.
--
John Lebetski
Woodstock, IL
77 Eleganza II

 

[robert mueller]

John,

As far as I know there is nothing different in the oil flow path in the 455
or 403. There is a difference in the lines to / from the oil cooler. If I am
incorrect PLEASE correct me.

Bottom line: in my opinion the Wix 51049 is the best filter for either the
403 or 455.

Regards,
Rob M.
The Pedantic Mechanic
USAussie - Downunder
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
USA '77 Kingsley - TZE 267V100808


-----Original Message-----
From: Gmclist [mailto:gmclist-bounces] On Behalf Of John R.
Lebetski
Sent: Monday, June 19, 2017 9:28 AM
To: gmclist
Subject: Re: [GMCnet] Larger Engine Oil Filter

It think it's like this. The big block and small block take a different
recommended filter. Then, there is also a longer version of each of those
for HD service.
--
John Lebetski
Woodstock, IL
77 Eleganza II

 

[john r. lebetski]

Rob my assumption was that in ACDelco the 455 used the larger diameter PF24 style and the 403 used the smaller PF58 style as does the Olds 307. I
could be wrong there and have no 403 here to look at.
--
John Lebetski
Woodstock, IL
77 Eleganza II

 

[robert mueller]

John,

AHA, I understand, I was only considering the length of the filter not the
diameter!

Bottom line: the oil filter adapter (part that bolts to block) and oil
cooler adapter are the same so the Wix 51049 will fit.

Regards,
Rob M.
The Pedantic Mechanic
USAussie - Downunder
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
USA '77 Kingsley - TZE 267V100808


-----Original Message-----
From: Gmclist [mailto:gmclist-bounces] On Behalf Of John R.
Lebetski
Sent: Monday, June 19, 2017 12:09 PM
To: gmclist
Subject: Re: [GMCnet] Larger Engine Oil Filter

Rob my assumption was that in ACDelco the 455 used the larger diameter PF24
style and the 403 used the smaller PF58 style as does the Olds 307. I
could be wrong there and have no 403 here to look at.
--
John Lebetski
Woodstock, IL
77 Eleganza II

 

[robert mueller]

G'day,

I stand corrected.

I have received an OFF NET message regarding this email from someone who
noted that the oil cooler adapter used on the 455 is different from the 403
and he is correct.

There is a tab on the "top" of the oil cooler adapter that is located
differently on the 455 than the 403.

The tab on the oil cooler adapter goes into a slot in the oil filter base
which clocks the position of the lines differently.

However, this does not affect the installation of the oil filter; the Wix
51049 will fit either installation.

Regards,
Rob M.
The Pedantic Mechanic
USAussie - Downunder
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
USA '77 Kingsley - TZE 267V100808

 

[Bob Dunahugh]

The Fram PH25 that I've been installing on my 403 is 1 inch shorter then the Wix 51049. Thus the 51049 will by passing less unfiltered oil at the bypass valve. As a note. The Wix 51049 cross references to an AC Delco LAF1881, and a Fram PH11. The Fram PH25 is 4 inches long. The Wix 51049 is 5 inches long. So how long is the AC Delco LAF1881, and the Fram PH11? As another note. On a fresh new engine. You need that longer filter so less oil gets by passed. Bob Dunahugh 78 Royale

________________________________
From: Bob Dunahugh
Sent: Sunday, June 18, 2017 5:25 PM
To: gmclist
Subject: RE:Larger Engine Oil Filter

Ernest has that right as to a larger filter. As I recall the Olds oil filter that was listed years ago were larger. Bob Dunahugh

________________________________
From: Bob Dunahugh
Sent: Friday, June 16, 2017 11:46 PM
To: gmclist
Subject: RE:Larger Engine Oil Filter

The original filters of yesterday for the Olds were longer as I recall. Then the filters got shortened. So this is that longer filter of the pass. Perfect fit, and no hazard of getting hit.

Bob Dunahugh 78 Royale

 

[robert mueller]

Bob,

The amount of oil bypassed is controlled by the bypass valve in the oil filter base which according to MM X-7525 it is set to open
at 5.3 to 6.3 psi (ref.: Page 6A-2).

The pressure drop across the oil filter will contribute to reaching that pressure drop. The pressure drop through the filter is a
function of the micron rating (the lower the micron rating the higher the pressure drop) and the surface area of filter medium (the
smaller the surface area of filter medium the higher the pressure drop). Also as the oil filter medium gets contaminated with
particles the pressure drop goes up.

I've Googled Fram PF-25 but can't find the micro rating anywhere; the Wix 51049 is 21 micron. I was able to find the Fram HP5:
http://www.fram.com/media/64582/fram-racing-filter-sell-sheet.pdf and it has a lower micron rating of 18 micron. It is smaller than
the Wix 51049.

Regards,
Rob M.
The Pedantic Mechanic
USAussie - Downunder
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
USA '77 Kingsley - TZE 267V100808


-----Original Message-----
From: Gmclist [mailto:gmclist-bounces] On Behalf Of Bob Dunahugh
Sent: Monday, June 19, 2017 11:50 PM
To: gmclist
Subject: Re: [GMCnet] Larger Engine Oil Filter

The Fram PH25 that I've been installing on my 403 is 1 inch shorter then the Wix 51049. Thus the 51049 will by passing less
unfiltered oil at the bypass valve. As a note. The Wix 51049 cross references to an AC Delco LAF1881, and a Fram PH11. The Fram
PH25 is 4 inches long. The Wix 51049 is 5 inches long. So how long is the AC Delco LAF1881, and the Fram PH11? As another note. On a
fresh new engine. You need that longer filter so less oil gets by passed. Bob Dunahugh 78 Royale