Bypass oil filter

J

jeepguy1948

Well-known member
I do not need to hear any reasons for not wanting to use a bypass oil filter so if that is your opinion, well, that’s your opinion and I’m not asking for you to share it with me, this is simply a hypothetical question. If a Model A owner chose to use (for whatever reason) a bypass oil filter, which type is best (of the bypass filter systems available)? Thanks
 

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I did something like #3 above and it was good. Flathead Ford v8 always had a bypass filter and it trapped a lot of sludge. I drilled and tapped the valve cover and took the oil from the side of the block. I ordered the adapter on line and made my own bracket different from above but really the something.
 
Perhaps it would help if you specified the "available" bypass systems you are referring to. I did quite a bit of research before purchasing and installing this one from Snyders. It is the only complete system that I found. As others mentioned, with a little enginuity, one could be put together from various parts.

The kit from Snyders (and others) is a very good kit, but the casting needs some minor prep work. I discussed what to do in detail in this thread.

https://www.fordbarn.com/forum/showthread.php?t=318133

I've put 3 or 4 hours driving on mine so far. No leaks at all. I'm very happy with it.
 

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When I originally posed the question I did not know of any specifically nor did I know how many options there was. Now I know, there’s two (1) that you buy from the usual sources, and (1) that you build yourself.
 
Unless you already have parts laying around to build your own, the complete kit is the way to go. Just be sure to prep the casting as I mentioned. Good luck!
 
old31 said:
Are both adapters M6880 A50 and M6880 B50 usable. Is one as good as the other.

https://www.amazon.com/M-6880-B50-D...95-Mustang/dp/B08TB4BKC3?tag=atomicindus08-20

Also, is the system that katy shows (#3) better than a full flow from the vendors?
Click to expand...

Both A50 and B50 work. A50 is preferred by many people, as it has a more "period" look. However, A50 has been discontinued and is only available sporadically via eBay, swap meets, etc.

The filter setup shown in post #3 is a "partial-flow" filter, which is different from either a full-flow or bypass. While a full-flow filter takes in the full volume from the oil pump and returns it to the engine, and a bypass takes in a small fraction of volume and returns it to the sump, a partial-flow filter takes in a small fraction of volume and returns it to the engine. So it's sort of a hybrid.

My personal opinion is that the partial-flow setup pictured in #3 is less effective than the other two alternatives. Because the system returns oil up to the valve chamber, rather than down to the sump, there is back-pressure due to gravity on the filter. Since the filter is only taking in a small fraction of the oil volume, the pressure across the filter is low to begin with. This results in further decreased flow, so the amount of oil filtered per unit time is the least of the three methods.

Having said that, for Model A purposes, it's fine, it'll get the job done.
 
Alexiskai,
I am confused on the terms. Would the Snyder's kit be a bypass because it returns the oil to the sump albeit over the timing gears? The partial flow is because it goes to the valve cover where it is going to the bearings and dipper tray?
Thanks
 
alexiskai said:
Both A50 and B50 work. A50 is preferred by many people, as it has a more "period" look. However, A50 has been discontinued and is only available sporadically via eBay, swap meets, etc.

The filter setup shown in post #3 is a "partial-flow" filter, which is different from either a full-flow or bypass. While a full-flow filter takes in the full volume from the oil pump and returns it to the engine, and a bypass takes in a small fraction of volume and returns it to the sump, a partial-flow filter takes in a small fraction of volume and returns it to the engine. So it's sort of a hybrid.
Click to expand...


I wonder, if someone ever cut an oil filter open to see if the oil pressure is enough to use the whole filter or if the filter is only used at the lower portion because of the lack of proper oil pressure ...


ndnchf: Your filter looks kinda cute, while the original that comes with the kit look somehow bulky. What filter do you use ...?
 
amclass said:
I wonder, if someone ever cut an oil filter open to see if the oil pressure is enough to use the whole filter or if the filter is only used at the lower portion because of the lack of proper oil pressure
Click to expand...

The whole filter is always used, for two reasons: (1) capillary action causes the filter media to take up oil across its entire width; (2) the oil will seek the lowest-pressure area, so it will occupy the voids in the "intake" zone preferentially before it gets pushed through the filter by the oil behind it.

GeneBob said:
Alexiskai,
I am confused on the terms. Would the Snyder's kit be a bypass because it returns the oil to the sump albeit over the timing gears? The partial flow is because it goes to the valve cover where it is going to the bearings and dipper tray?
Thanks
Click to expand...

The Snyder's kit is considered a bypass even though it doesn't technically return straight to the sump – the timing gear is close enough. All bypass systems are also partial-flow systems, but not all partial-flow systems are bypass systems. The "partial" refers to the fact that it's filtering just a fraction of the oil coming off the pump, in contrast to "full-flow," which filters all the oil every cycle.
 
GeneBob said:
Alexiskai,
I am confused on the terms. Would the Snyder's kit be a bypass because it returns the oil to the sump albeit over the timing gears? The partial flow is because it goes to the valve cover where it is going to the bearings and dipper tray?
Thanks
Click to expand...

alexiskai said:
the partial-flow setup pictured in #3 is less effective than the other two alternatives. Because the system returns oil up to the valve chamber, rather than down to the sump, there is back-pressure due to gravity on the filter. Since the filter is only taking in a small fraction of the oil volume, the pressure across the filter is low to begin with. This results in further decreased flow, so the amount of oil filtered per unit time is the least of the three methods.
Click to expand...

GeneBob, You and me both. I don't see the difference between a bypass system and a partial flow system. Maybe I need a picture to explain it.
 
Ruth said:
GeneBob, You and me both. I don't see the difference between a bypass system and a partial flow system. Maybe I need a picture to explain it.
Click to expand...

Sorry for the confusion. A bypass system is a partial-flow system, but they're normally called "bypass" systems because, instead of returning oil to the engine for lubrication, they bypass the engine and return it back to the sump.
 
Alexiskai,
I understand now. It is a subtle difference in that the "bypass" isn't from the oil pump, the "bypass" refers to bypassing the oil supply into the bearings etc and goes to a zero back pressure return to the oil pan.

I like the way the Snyder's kit returns the oil onto the timing gears which is a pretty direct path to the oil pan.
Thanks,
Gene
 
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