Oil Filter

alexiskai said:
This is not correct information. The stock pump is a positive displacement gear pump. It creates very high pressure. I think I've seen figures of 80 psi+.

The reason people think it's a low-pressure pump is that the oil system as a whole is unpressurized. But the segment of the system between the pump and the valve chamber is highly pressurized, as you will find out if you ever block it.

The full-flow filter system places the filter in the pressurized segment of the system. The entire output of the pump is directed via a copper tube into the filter intake. If the tubing has been fitted correctly, there's nowhere else for the oil to go. Consequently the pressure into the filter is always as high as is needed for the oil to keep moving through the pump (remember the pump rpm correlates with engine rpm).

This means that statements like "full-flow filters reduce the flow of oil to the engine" are wrong. Unless the filter accessory becomes completely blocked, the volume of oil exiting the filter is the same as the volume of oil that would be flowing if the filter weren't there.
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Thank you Alexiskai for stating this once again. I was going to write the same response (but you did it much better) but I decided not to get involved because this subject has been brought up so many times in the past.

Please don't start drilling holes in your filter anti-flowback valve as recommended in a certain YouTube video.
 
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Going by what I was told. However, I now see that the lack of oil pressure is due to the lack of resistance to flow. If the full flow oil filter is added, you will get some resistance to flow and show oil pressure on a gauge if you have one. My concern on the Model A oil pump pressure is; that pressure is in the passage in the block with no leakage from that passage where the pump attaches.
So, I can see where the "no oil pressure" idea comes from and stand corrected. Since the full flow oil filter returns the oil to the lifter galley, it should be the same as no filter except for the time it takes to fill the filter itself.
I guess I just don't trust these new fangled ideas like filtering the oil. Before you know it, women will be voting!
 
n'Abend.


I had a previous professional career in engine construction and the study of friction and wear in conjunction with lubricant science.


What Alexis writes is 100% correct!


Everything that is filtered removes dirt. Air, water, oil, petrol... Why not use this option when it undoubtedly extends life?
 

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Alexiskai has it right IMO. There is plenty of pressure to use a filter as thousands of us who run one can vouch.
 
I can't remember the source, but I read somewhere that a good stock Model A oil pump has sufficient pressure/volume when using a bypass filter system to completely filter all the oil in the Model A pan in roughly 20 minutes. Not sure how factual this is, but certainly better than no filtration at all. Anyone else hear something similar? I'm using a KENZ bypass on my roadster and seems to be keeping the oil cleaner than running without one.
 
mcgarrett said:
I can't remember the source, but I read somewhere that a good stock Model A oil pump has sufficient pressure/volume when using a bypass filter system to completely filter all the oil in the Model A pan in roughly 20 minutes. Not sure how factual this is, but certainly better than no filtration at all. Anyone else hear something similar? I'm using a KENZ bypass on my roadster and seems to be keeping the oil cleaner than running without one.
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Yes, the exact time depends on the size of the sump and how fast the engine is running but it’s usually 10-20 minutes.
 
People still run filters on Model T's, even though there is no oil pump. The flywheel slings oil around that lubricates the engine and transmission. A tube is placed in the flywheel housing that picks up some of the oil slung by the flywheel. This is run through a hydraulic oil filter that has no check valve because the oil pressure available is not enough to open the valve. The oil is then plumbed to the front of the engine to help lubricate the camshaft gears and front bearing. The Model T engine did come with an oil pickup tube that put some oil in the front of the engine from what was slung off the flywheel.
 
By today's standards the model T. engine sounds like a impossibility because it has no oil pump no water pump no fuel pump yet they're still running 100 years later Henry ford definitely knew what he was doing!!!
 
:)
Fullraceflathead said:
By today's standards the model T. engine sounds like a impossibility because it has no oil pump no water pump no fuel pump yet they're still running 100 years later Henry ford definitely knew what he was doing!!!
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We will not be around, but there hopefully will still be original Model A’s and T’s being driven by that generation.

That’s why I think it is important that we try and keep a percentage of these cars as stock as possible.

Enjoy.
 
"The straight 8 falthead engines that Pontiac used in the late 40's didn't have oil filters. According to the service manuals they utilized a series of baffles in the oil pan that would reverse the drainback flow of the oil and supposedly would help any particles suspended in the oil to drop out.
There was also a note stating that if you were involved in a rollover accident it was recommended to dissassemble and clean the engine."
https://www.jalopyjournal.com/forum/threads/non-oil-filtered-motors.863542/
 
updraught said:
"The straight 8 falthead engines that Pontiac used in the late 40's didn't have oil filters. According to the service manuals they utilized a series of baffles in the oil pan that would reverse the drainback flow of the oil and supposedly would help any particles suspended in the oil to drop out.
There was also a note stating that if you were involved in a rollover accident it was recommended to dissassemble and clean the engine."
https://www.jalopyjournal.com/forum/threads/non-oil-filtered-motors.863542/
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I suspect that if you were in a rollover accident, you had more pressing issues than dirt getting re-introduced into your oil.
 
"There was also a note stating that if you were involved in a rollover accident it was recommended to dissassemble and clean the engine."

Also recommended that you change your underwear.
 
Ruth said:
I am a big believer in filters, both oil and air along with fuel. So you, IMO they are worth it.

With todays oil, the contaminants stay suspended in the oil so you need a filter to remove them. With non-detergent oils of the past, the contaminants drop out in the pan as sludge.
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I agree. Most oils are detergent type now, and contaminants are suspended. I remember with non-detergent oils, pulling the valve cover or oil pan meant cleaning out all the crusty gunk that was left behind. With modern oils, none of this happens anymore because it’s suspended. You can sill buy 30w non-detergent oil, but why would you? Like the old Fram commercial, the mechanic says “you can pay me now, or pay me later”
 
Even a partial filter will extend the effective life of your oil...and engine. Partial has the added advantage of limiting risk of a clog starving the engine of oil. I am running Mobil One 0-40 weight and a partial flow filter. As log as I paint the filter cartridge flat black it looks original to anyone but another A owner. If you drive more than 500 miles per year it is well worth it.
 
For those of you running a by-pass (partial flow) filter, what type of filter is being used? A proper by-pass filter or using a full flow filter plumbed in as a by-pass filter?
 
katy said:
For those of you running a by-pass (partial flow) filter, what type of filter is being used? A proper by-pass filter or using a full flow filter plumbed in as a by-pass filter?
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I use a spin-on filter with the best possible filtration. PBL 14670 or 30001, or Fram FS8A or XG8A.
 
katy said:
For those of you running a by-pass (partial flow) filter, what type of filter is being used? A proper by-pass filter or using a full flow filter plumbed in as a by-pass filter?
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Well, the kit came with a Motorcraft FL-1A, so that's what I'm using for now.
No complaints - the oil definitely stays cleaner than it did without a filter; I figure it can't hurt and probably will help. I did, however, paint it engine green. Leaving it white would have been too obnoxious and modern looking.


511165
 
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