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01-09-2018, 09:40 PM | #21 | |
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Re: Oil filters on flatheads
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01-10-2018, 08:39 AM | #22 |
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Re: Oil filters on flatheads
I'm the guy who posted the original thread. Wow! Lots of good thoughts and very interesting-
Thanks! Bill:: |
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01-10-2018, 10:04 AM | #23 |
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Re: Oil filters on flatheads
Offenhauser used to make a part just for this. It was made of aluminum and bolted to the head bolts, the other side had three tapped holes that picked up the mounting points of a standard 8BA filter. I had one I picked up at the Chickashaw swap meet about 20 years ago. Unfortunately, I sold it several years ago. You might want to go to the "Exeter Speed Shop" web site where they have the entire Offenhauser catalog in pdf format. I think there is a picture of one there which may help in find one or perhaps making an analog.
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01-10-2018, 11:16 AM | #24 |
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Re: Oil filters on flatheads
Another trick is long nuts (coupling nuts) used as spacers and a std filter that fits to the headbolts.
They come in stainless if you want it nice and shiny. |
01-10-2018, 02:16 PM | #25 | |
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Re: Oil filters on flatheads
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01-10-2018, 02:22 PM | #26 |
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Re: Oil filters on flatheads
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10-28-2018, 04:19 PM | #27 |
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Re: Oil filters on flatheads
I wrote the original post. I think I am convinced. This winter I will be re-installing the Ford bi-pass filter on my one flathead that does not have one. Many thanks for all of the comments and ideas. There is lots of wisdom and knowledge at the Ford Barn - great group!
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10-28-2018, 06:12 PM | #28 |
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Re: Oil filters on flatheads
One thing to keep in mind is that a by-pass filter can filter to a much smaller micron size compared to a full-flow filter. A lot of modern diesels use by-pass filters for that reason.
Last edited by JSeery; 10-28-2018 at 06:17 PM. |
10-28-2018, 06:57 PM | #29 |
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Re: Oil filters on flatheads
Also keep in mind that the by-pass filters used on diesels are capable of a smaller micron size than the commonly used Ford replacement by-pass filters.
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10-28-2018, 07:04 PM | #30 |
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Re: Oil filters on flatheads
What is the filtration size on the flathead filters?
Is the Wix 51006/NAPA 1006 a good number? It is rated at 32 micron. Last edited by JSeery; 10-28-2018 at 07:12 PM. |
10-28-2018, 07:16 PM | #31 |
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Re: Oil filters on flatheads
Bypass filters, by their nature, are able to slow down the flow of oil as the filters load up, without affecting oil flow to the bearings. Modern filters must pass oil without a major drop in pressure/volume, so the finer particles are passed, and as they load up, their safety valves open to pass without filtration at all. The bypass filters not only screen out finer particles, but they require only 10 miles of driving for about 95% of all the oil to pass through the filter at least once. A feature that all oil filters share is the added total volume of oil in the system, which is helpful in keeping the engine cool, as well as preventing the oil itself from breaking down from excess heat. All cars today need a filter of some kind, due to the modern detergent oil suspending particles rather than allowing them to drop out overnight, becoming sludge in valve galleys and oil pans.
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10-28-2018, 07:53 PM | #32 | |
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Re: Oil filters on flatheads
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I am running an Amsoil by-pass filter rated in the 2-3 micron range, same rating as the ones used on the diesels. In a measured test at idle speed the filter passed 5 Qts. of oil in 11 minutes.
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10-28-2018, 11:17 PM | #33 |
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Re: Oil filters on flatheads
[QUOTE=51 MERC-CT;1690436]Those are the normally installed replacement filters. Don't know what the micron rating is but have heard from 10 to 25 micron.
I am running an Amsoil by-pass filter rated in the 2-3 micron range, same rating as the ones used on the diesels. In a measured test at idle speed the filter passed 5 Qts. of oil in 11 minutes. so, at cruising speed, about 4+ times the volume? That sounds roughly equivalent to 20+ qts filtered to attain the 95% in 10 miles of cruising. This is sounding so good, I wonder what advantage there could be to use 100% filtered on modern cars?
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10-29-2018, 01:05 AM | #34 | |
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Re: Oil filters on flatheads
[QUOTE=ford38v8;1690494]
Quote:
The .060 dia. restriction hole determines how much volume is delivered at what oil pressure. At a higher oil pressure there may be an increased percentage of volume, but not by a factor of 4 as you speculate.
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10-29-2018, 01:23 AM | #35 | |
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Re: Oil filters on flatheads
[QUOTE=51 MERC-CT;1690511]
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10-29-2018, 12:11 PM | #36 |
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Re: Oil filters on flatheads
The debate to use an oil filter, or not, on a flathead engine will probably never end. Regardless of what Henry Ford did in the early days of his Flathead powered vehicles, in my way of thinking, how many modern gas or diesel engine vehicles are being produced today without an oil filter? It just makes good sense to me, if I'm working on one of my Flathead engines, and have the ability to add an oil filtering system, I'm going to do it.
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10-29-2018, 01:03 PM | #37 |
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Re: Oil filters on flatheads
For what its worth, my '47 never had a filter. It was rebuilt I don't know how many years age, now has 35,000 on rebuild, doesn't leak or burn oil, 70 lbs at cold idle/20 at hot idle, use 10w-30 and change every 1,000 miles.
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10-29-2018, 01:16 PM | #38 |
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Re: Oil filters on flatheads
I'm with "JM" on this. I have just finished my 258' rebuild and I am going to look into one of those Amsoil filters for it. They look to me to be the ideal filter for these engines with the finer filter and the volume "51 MERC-CT" has posted, especially the way these cars are used. I will keep the present stock setup on my '51 Ford.
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10-29-2018, 11:49 PM | #39 |
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Re: Oil filters on flatheads
Legend has it modern oils do not break down with heat nearly as fast as old oil does.
The important part is to keep your oil clean, you could reduce the changes to 20-50,000 miles and only replace the filter, if you could filter it finely enough! (Change the filter on a modern car every 1,000 KMs and see how long the oil lasts.) A bypass filter would be a great asset to modern engines. I'll let you guy figure out how to do that.
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10-30-2018, 09:18 AM | #40 | |
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Re: Oil filters on flatheads
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