Anyone use a inline filter on their external wet sump system before the pump?

I have 2 Peterson scavnege filters one on each line http://www.petersonfluidsys.com/filter_oil.html

What micron filter do you use? do you use the one with a by pass or without? also noticed that they have filters for use with dry sump, what would be the difference?

What are you trying to do??

hemi-itis, basically the same as you. I have a single line external set up . As you, I want to filter the oil before the pump. Reason is my buddy just ruined his engine from a a broken lifter wheel, sent pieces of needle bearings into the pump which ground them up so fine they went through the Fram filter and though the complete system . I was looking at the Peterson 09-0408-12an. It's the filter with the 90 on the end which would screw onto the fitting coming out of the pan. I guess i'm looking for what micron to use and why a dry sump would be different than a wet as oil is pulled through each. Or is it that Peterson in their description didn't think anyone would use it in a wet sump external line .

Those things don't usually get measured in microns, there's just a screen in there to catch large debris. In reality, if it gets by the screen in the pickup its likely going to get by the screen in those filters also. A good filter ahead of the pump - measured in microns - would have to be about as large as a regular filter so as not to restrict flow. And if you were to find one that large then the one after the pump would be pointless.

I don't know what the micron is on the scavenge filter. I had a piece of my valve spring take out my oil pump. the screen in the filter is way smaller than the pickup. that piece would of never got to the pump with the filter on.

With a wet sump,the pre-filter only catches anything large enough to jam the rotors in the pump.The filter does the filter-ing,,,,,,IMO a NON-bypass filter should be used like the JO-MAR that can also flow good numbers!
When I used the FRAM-HP with a Milodon pump,it would be in bypass mode and not filter doodleysquat.

I sent off a e-mail to Peterson Fluid systems , I'll see what they say what I should use.

In general, restriction on the suction side of any pump can really hurt its performance. Agree a coarse screen of some type to catch the big stuff is best.