Which way does the oil flow?

[Nebraskan]

Does the oil flow down the center tube into the filter then out (filtered) through the smaller outside perimiter holes then to the engine? Or, does the oil come from the pan, through the smaller outside holed and up through the center hole to go filtered to the engine?

I set up a sandwich adapter for bypass, but it makes me wonder if I'm sending oil that has not been filtered by the full flow to the bypass filter (straight from the pan) or if I'm filtering the oil (hopefully) before it goes to the bypass filter.

 

[mrsilv04]

Dirty oil comes in through the smaller holes, is filtered, and passes back to the engine through the center hole.

An ADBV allows the filter to only work this way.

 

[Nebraskan]

Then my oil going to my Baldin B50 filter is coming from the unfiltered side, as I am using a sandwich adapter for the oil feed.

 

[Titan]

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Then my oil going to my Baldin B50 filter is coming from the unfiltered side, as I am using a sandwich adapter for the oil feed.

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DOH!

 

[Nebraskan]

Makes the ST 3387A filter sort of wortless to a point then. That 3387A filter should last a very long time, since it's basically getting no load.

 

[Pete C.]

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Then my oil going to my Baldin B50 filter is coming from the unfiltered side, as I am using a sandwich adapter for the oil feed.

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Ain't necessarily so! The oil tap could be, and, most likely is, connected to the clean side of the oil flow via internal porting in the adapter. Next time you change your FF filter, look for the "bridge" between the clean (internal, big hole and the oil tap hole in the adapter.

 

[Gary Allan]

Pete ..he is getting the pre-filtered oil from the engine. The way the Permacool setup does it ..it interrupts the inflow (outer ring) and extends the center thread (with a hex to hold it fast to the block).

I still don't think it makes too much of a difference. He'll be passing most of the flow to the full flow 24/7 ..so it's going to snag the majority of the 25-30+um particles anyway. The bypass will just polish the 10% (+/-) to the finer level. He would see the leftovers anyway

 

[Nebraskan]

Yep, Gary... you're right!

Finally found a PDF file showing flows for typical bypass and full flow filter systems on cars.. saved it to my computer too, BTW. The sandwich takes the oil from the outer rim area before it goes to the outer side of the FF filter. Oil in the FF filter flows from outside -> inside and up through the center thread to the engine. So the oil going to the Baldwin B50 bypass is going there before the prefilter (so to speak)and circulating around the 1.2 to 1.6 quarts of oil/minute back to the pan.

The regular filter should last a very long time indeed. There should be very few particles that are mixing around in the oil that are large enough to be trapped by the 30µ of the full flow filter. The FF filter in this case gets very little load.

Only above the FF filter, from the Oil Pressure Sending unit, could I get pre-filtered oil that would go to the BP filter, but what a pain! Now I need to find out from Baldwin, just to be sure, if the B50 filter mount takes oil from the outside and goes through the filter to exit through the center hole. I hope that is the case!! Because if not, any particle that happened to drift up the oil line to the BP filter might clog the 1/16" restrictor hole (in the center thread area) if the oil came in there rather than leave there. I'm hoping that it is the restrictor heading OUT of the filter!!

 

[Gary Allan]

Very few spin on filters have a normal flow from inside to out. Your filter goes outside to in.

Here's another useful site that I've found over my term here. FilterMart

This page should be their offering for the Baldwin B50. Note the "Direction of flow". If you backtrack to the main page, you'll see their XREF utility. It's useful in finding whether the price you're seeing/paying is competitive.

Don't buy theirs, though. It's only rated for 25um nominal

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The regular filter should last a very long time indeed. There should be very few particles that are mixing around in the oil that are large enough to be trapped by the 30µ of the full flow filter. The FF filter in this case gets very little load.

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Well, look at it the other way around. The ff will trap most of the 25um and larger particles ..unloading the bypass of a good bit of the total contamination.

Your sender is probably post filter. If you can get to it easy enough, hook up there. I still think you'll be pleased with how you have it hooked up now.

 

[skippy]

It was my understanding cylindrical filters are designed to filter from the outside in because there is more surface area on the OD than on the ID. Is this not correct?

 

[Gary Allan]

Most do flow from outside to inside (all automotive and hydraulic spin-ons that I've ever encountered)..but in the case of spin-on full flow filters, there's very little depth to the media ..so the surface areas are identical. Each convolution is mirrored inside and outside. Now depth media it would surely make sense. You would want as many ingress pathways as possible as they'll tend to block as the filter gets saturated. It would reason that you need more exterior pathways than interior since debris will not reach the interior as easily.

I also imagine that there's something about collapsing an arch that may have something to do with it too ...or so I reason.

 

[Nebraskan]

Come to think about it, even our Pall membrane filter we use in the winery as the final sterile filter, before bottling, flows from outside to inside.

Now THERE'S you a filter!! 20 inch bayonet in a stainless steel mount. Only $167.00 per filter. But, filters down to 0.45 micron.

 

[Gary Allan]

I have a bag filter that flows inside out. A couple of them. One's a sock type ..the other is rather odd. It has a wire reinforced bag. The bag would be attached not unlike a flag to a pole with the open end of the bag being integrated/wrapped around the center core. This wraps around the center core in a spiral with the wire mesh not allowing the bag to touch itself as you wind it around.

 

[Nebraskan]

I had a bag filter once upon a time too... it was called a Kirby.

You're not allowed to talk about the bag "touching itself" in here, are you?

LOL

Looks like a device that would see little use by most of the do-it-youselfers that have a hard time figuring out that the filer unscrews counter-clockwise.

 

[Gary Allan]

It's the oddest bird in my collection. I think I can adapt it to use paper towels/tp (in some combo) ..but I imagine that it's a very expensive filter to change. It's gotta be way more than the whole thing cost me (about $40). It is a novel way of providing WAY more square FOOTAGE in a given container.

 

[Nebraskan]

Put one wrap of furnace filter in there, call it good and paint it orange