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RE: Preluber pics Flatlander, that is an excellent find, please count me for one maybe two and of course if there are any adapter/ hoses for that pump i will take them too. george

Bjorn, Differencial pressure of 15 psi is needed for bypass valve to be open, which means that 15psi have to be maitain at all times, but it also mean that measuring across the filters that pressure cannot be higher!!! with present setup./ bypass in this case means parallel/. As far, as old can...

Answer is: yes and yes, highway drive ~50mph temp. steady 180deg., oil fresh synthetic RotellaT 5W-40, filters brand New Wix 51970 XD, seems like the headache never stops, and like you said increasing filter media surface should help/third parallel filter/. Somehow there is always good and bad...

Matt, I don't have specific differencial pressure meassuring gauge, what I'm actually testing is a pressure at two points one pre filter @ the bottom of filter base @ 3/8" port, and the another post filter at the top of oil cooler where oil sampling valve is located. I'm using two Stewart-Warner...

That gives me an idea to add one more parallel filter /not bypass/to the system, where that adapter port will become handy, and hopefully with three filters in parallel differetial pressure will not exceed that magic 15 psi. as a side note filters are new and oil is a synthetic Rotella T 5W-40...

Builder, first the size of reduction screw is 3/4 to 1/2 inch, secondly valve that im concern is a bypass valve built in filter base that opens @ 15 psi bypassing both filters, and that alone worries me more. I believe that valve opens at around ~1800 rpm. I agree, the issue of air being...

OK! here are the pictures that additional port provides more flexibility, My next concern is a filters bypass valve that opens ~ 1800 RPM w two parallel 51970XD Wix filters simply measuring pre and post filter pressure w two identical up to 100psi mechanical gauges

..... Can anyone suggest another option/ port? JimK I believe there is another option if you use filter adapters that I design. I wish I know how to post the pictures. Best regards, George C. Tampa,Florida