Part Number: 51458
UPC Number: 765809514584
Principal Application: Case, Oliver and White Farm Tractors, Drott, Hercules, Hobart, Michigan Equipment
All Applications
Style: Spin-On Lube Filter
Service: Lube
Type: Full Flow
Media: Paper
Height: 8.078
Outer Diameter Top: 4.285
Outer Diameter Bottom: Closed
Thread Size: 7/8-16
By-Pass Valve Setting-PSI: 13-19
Anti-Drain Back Valve: Yes
Burst Pressure-PSI: 450
Max Flow Rate: 11-13 GPM
Nominal Micro Rating: 16
Flow and pressure have to be taken into consideration in order to get filtration performance.
FIRC the LDT is 28 GPM at 1700RPM... I might be a gallon or two off but I know thats really close to it and obviously the higher the RPM the more flow you get... The Wix 51458 is rated at 11-13 GPM so your best performance is 22-26 GPM with two filters in series which is ok for lower RPM but really not adequate for higher RPM ranges.
In designing hydraulic applications you generally want your filtration capabilities to exceed your systems flow capacity, or at least match it up as best as you can; If not you end up building unnecessary pressure and over run the bypass, or even exceed the bypass's capability. In this case the trucks bypass would kick in and take care of the slack but you really want to keep the bypassed oil as low as possible as it is obviously unfiltered. Another affect of over powering the filter is you begin to exceed the filters filtration quality... Hydraulic pressure will force a larger micron object through a element of smaller rated size and / or simple collapse the element in on it's self.
Being that John is making the bases it would be easy enough to change the external thread size to take a filter large enough to fall within the system performance (1.5-12, 14 or 16 TPI) but then your getting back into the commercial filter sizes, with that in mind you hit another wall because with few exceptions things like bypass and anti drain back valves don't come in commercial filters sizes and the few that do have them get to be quite expensive and offer very little if anything in improved filtration performance over the stock filters.
Also... anti drain back will help fix the issue of contamination draining back into the oil pan but is still not going to improve oil pressure on start up as the system will still drain forward through the block with a upside down filter.