Engine: by-pass oil filter

[oldguy_46ca]

I am using a NAPA 1050 oil filter on my 259 partial flow engine. This filter is designed for by-pass systems and is supposed to restrict the flow of oil. My question is, does it restrict the flow enough on its own or is a flow restrictor fitting needed in the oil line from the engine to the filter?

[Bud]

There should be a restrictor on the inlet side of the filter which if I remember correctly has around a .040 hole in it. If you have an original oil filter mount installed on your engine, it should already have the restrictor on it. Bud

[oldguy_46ca]

There should be a restrictor on the inlet side of the filter which if I remember correctly has around a .040 hole in it. If you have an original oil filter mount installed on your engine, it should already have the restrictor on it. Bud

I'm replacing the original mount with a Baldwin OB1305/NAPA 4755 filter base. It requires a separate flow restrictor. It can be in the filter or the tube.

[Flashback]

Restrict the fitting on the incoming side of the filter, if it is not already a restricted fitting.

[doofus]

Hey Old Guy some oil filters have a restriction built in to the exit or threaded hole, Champ filters for sure.check it out. luck Doofus

[DEEPNHOCK]

The part numbers for the Studebaker V8 partial flow filter are listed below.
The restriction is a fitting in the line, and not in the filter itself.
It should not have a 'bypass' valve, as it is a partial flow system filter.
Depending on the brand, it 'could' have an anti-drainback valve (which is NOT a bypass valve).
Check your individual choice of filter to be sure, as years of consolidation of part numbers by manufacturers have muddied the waters for replacement parts.


AC-Delco P3
ALLIS-CHALMERS 1EK11972
ALLIS-CHALMERS 4512207
ALLIS-CHALMERS 4512207-4
ALLIS-CHALMERS 45122074
ALLIS-CHALMERS 74900600
ALLOY ABH-50
AUTOPAR FE20
AUTOPAR FE63
B&W-LATHROP P-2417
BAKER 101254
BAKER 737R1
BAKER 737W1
BAKER 9033AM1
Baldwin B222
Baldwin B296
Baldwin B494
Baldwin B50
BIG A 92050
Bosch 0451202001 1
Canadian Tire 17-1722
CARQUEST 85050
CATERPILLAR 3I-1113
CATERPILLAR 6663172
CATERPILLAR 68147
CATERPILLAR C-68147
CENEX CO97
Champ PB50
Champ PH226
CHAMPION OF412
CHECKER 95021
CHRYSLER 2196908
CHRYSLER 3154364
CHRYSLER 8990508
CHRYSLER 925418
CHRYSLER 928055
CHRYSLER 936407
CHRYSLER 991718
CHRYSLER J0925418
CHRYSLER J0928055
CHRYSLER J0936407
CHRYSLER J0991718
CHRYSLER J3154364
CHRYSLER J8990508
CLARK 1752522
CLARK 990936
CO-OP PL-50
COOPERS AZL057
CROSLAND 536
DELUXE WD-97
Donaldson LFP550050
Donaldson P550050
Donaldson P550196
Donaldson P550972
Donaldson P559615
DYNALIFE CN-51050
DYNALIFE CN-7
FACET 50
FIAAM FT4418
FIAT 4007348
FIAT 4026075
FIAT 4083490
FIAT 4107775
FIAT-ALLIS 74512207
Filters Incorporated OF50
Fleetguard LF3543
Fleetguard LF607
Fleetguard LF786
FLEETRITE LFR-8607
Fram PB50
General Motors GM 5574639
General Motors GM 5574641
General Motors GM 94169779
General Motors GM 94360419
GONHER GP50
GONHER GP50M
GRAND PRIX PB50
Group 7 L30003
HASTINGS LF117
HASTINGS LF198
HASTINGS LF445
HERCULES 208728
HERCULES 256274
HERCULES 256274-B
HERCULES 286760-C
HOBART 509021
HUTCHEN S-3
HYSTER 180282
HYSTER 180320
HYSTER 181769
HYSTER 3000043
Isuzu 8-94169-779-2
Isuzu 8-94360-419-0
Isuzu 8-94360-419-1
ITM 11-16305
JIFFY LUBE HL50
John Deere HMF600L04340
KNECHT FO-356
KNECHT FO-370
KRALINATOR L23B
KRALINATOR L30
LEE LF-3
LPM 1350-5050
LUBER-FINER LFP2270
LUBER-FINER LFP3
LUBER-FINER PB50
Lucas Girling F5541
Lucas Girling F646
Mann Filter WP9.31/1O
Mann Filter WP931
MARATHON PB50
MARATHON-LETOURNEAU PB50
MASSEY-FERGUSON 1032015-M91
MASSEY-FERGUSON 1900377-M91
Master Parts PB-50
MIGHTY L20024
MIGHTY L30003
MIGHTY PB50
Mitsubishi J0925418
Mitsubishi J0928055
Mitsubishi J0936407
Mitsubishi J0991718
Mitsubishi J3154364
Mitsubishi J8990508
MOBIL L30003
MOPAR L-4
MOTORCRAFT FL 3
NAPA 1050
NELSON 85006-A
NELSON B-335-SCR
PHILLIPS 66 P3
PHILLIPS 66 WO1050
PROMATCH 68147
Purolator L10019
Purolator L30003
Purolator L35492
Quaker State L30003
Quaker State PO-116
ROL-PAK FPB-50-BP
ROL-PAK FPBQ-50-BP
RYDER 990936
SHELL L30003
STP PB50
TELEDYNE F-600L-4340
TENNANT 53055-2
UNITED (ENGINE LIFE) U4L
UNOCAL OF1050
WALMI WS-50
WARNER PB50
WAUKESHA 199269
WGB S-87-CP
WHITE 1-4397-A
WHITE 104397-A
WHITE 600136-AA
WHITE 60514-AS
WHITE 605814-ASA
Wix 51050

[oldguy_46ca]

I stated NAPA 1050 in my original post and it is on your list Jeff. It has no anti-drainback valve. It is designed for by-pass or partial flow systems. My question is whether or not this particular filter restricts the flow enough. The engine came with a brass fitting that screws into the inner front side of the driver's side head (the outlet) that has a small opening or restriction. It also came with a NAPA 1050. So again, my question is whether or not the restricted flow of a 1050 is sufficient on its own for a Studebaker 259 V8?

[gordr]

Is the NAPA 1050 a cartridge filter, or a spin-on? The cartridge filters (replaceable element that goes in a canister) require a restrictor fitting on the inlet (pressure) side. The hole is .050" IIRC. The spin-on bypass filters, and Studebaker did use them, usually had the restrictor built into the filter itself, visible as a small hole in the bulkhead beyond the end of the spin-on thread well. You didn't need a restrictor in the pressure line, in that case.

[oldguy_46ca]

Is the NAPA 1050 a cartridge filter, or a spin-on? The cartridge filters (replaceable element that goes in a canister) require a restrictor fitting on the inlet (pressure) side. The hole is .050" IIRC. The spin-on bypass filters, and Studebaker did use them, usually had the restrictor built into the filter itself, visible as a small hole in the bulkhead beyond the end of the spin-on thread well. You didn't need a restrictor in the pressure line, in that case.

The 1050 is a spin on. Thanks for the info. I have contacted NAPA for the specs and when they get back to me I will post the results here.

[oldguy_46ca]

I waited three days and NAPA finally just sent me a phone number to call. I don't have time for that right now. I'm going with gordr's advice (see above).

[DEEPNHOCK]

I waited three days and NAPA finally just sent me a phone number to call. I don't have time for that right now. I'm going with gordr's advice (see above).

NAPA buys all of it's filters from Wix, so they would just refer you over there...

1050 NAPA - 51050 Wix

NAPA Spec: http://www.nfhconnect.com/Lookup/Par...0704&Brand=NAP

Product Specifications

Part Number:	1050
UPC Number:	765809135840
Style:	Spin-On Lube Filter
Service:	Lube
Type:	By-Pass
Media:	Enhanced Cellulose
Height:	5.178(132)*
Outer Diameter Top:	3.66(93)*
Outer Diameter Bottom:	Closed:
Thread Size:	5/8-18
By-Pass Valve Setting-PSI:	None
Burst Pressure-PSI:	380
Max Flow Rate:	1-3 GPM
Nominal Micron Rating:	10
Operating Temp. (min):	0
Operating Temp. (max):	0
Capacity:	0
Filter Area:	0

( )* denotes metric

Gasket Diameters

No Gaskets found

Part Number: 1050

Wix Spec

Product Specifications

Part Number:	51050
UPC Number:	765809510500
Style:	Spin-On Lube Filter
Service:	Lube
Type:	By-Pass
Media:	Enhanced Cellulose
Height:	5.178(132)*
Outer Diameter Top:	3.66(93)*
Outer Diameter Bottom:	Closed:
Thread Size:	5/8-18
By-Pass Valve Setting-PSI:	None
Burst Pressure-PSI:	380
Max Flow Rate:	1-3 GPM
Nominal Micron Rating:	10
Note:	By-Pass Style Filter - Filters Out Contaminants To Extend Oil Drain Intervals. If Shorter Version Required, Use &&51051&& or &&51320&&:
Operating Temp. (min):	0
Operating Temp. (max):	0
Capacity:	0
Filter Area:	0

( )* denotes metric

Gasket Diameters

Attached	2.834 (72)*	2.462 (63)*	0.200 (5)*

[StudeRich]

Great! No mention of the restrictor or it's size but it clearly is there as you can see.

[Bud]

The Wix 51050 and Fram PB50 filter have a restrictor built into the outlet side of the filter, but I still recommend using the restrictor that Studebaker originally specified on the inlet side of the filter. You could have a low oil pressure issue without the restrictor on the inlet side, especially when the oil is hot as by pass filters dump the filtered oil directly back to the oil pan. Bud

[DEEPNHOCK]

Technically, as long as the filter can handle the system pressure, it matters not where the restrictor is.
Studebaker made the restrictor the last item in line, as it would only see filtered oil.
The oil filter restrictor is post media, so it works the same way.
On a bypass system, no matter where the restrictor is, or even if the filter was 100% plugged, the engine will not see a low oil pressure due to the bypass filter setup.

The Wix 51050 and Fram PB50 filter have a restrictor built into the outlet side of the filter, but I still recommend using the restrictor that Studebaker originally specified on the inlet side of the filter. You could have a low oil pressure issue without the restrictor on the inlet side, especially when the oil is hot as by pass filters dump the filtered oil directly back to the oil pan. Bud

[Bud]

If a by pass filter is plugged there won't be an oil pressure drop as no oil is flowing through it. A new filter has little restriction which allows more oil to flow through it which will drop the oil pressure. Keep in mind with a by pass filter, part of the oil that is meant to lube internal engine parts is being diverted through what is essentially a leak in the lube system which will drop the oil pressure. The amount of pressure drop depends on a restriction to oil flow through the filter. Studebaker specified the installation of a restrictor on the by pass filters and I recommend using one of the correct size to maintain good oil pressure. Bud