Full (or 95%) oil filtration

[Cartravel]

I am curious about the oil filter on the '51 shown in a post below. I assume a hot engine like this would have full oil filtration, but it has an original bypass filter. I thought you couldn't do that. I have done the 95% mod on the flathead I built, but have not come up with a filter arrangement. I was thinking of modifying an original by replacing the single pinhole with a bunch of holes. This would reduce one restriction, but I was worried about the filter material in the original filter. I like the looks of the original, and would like to know if there is a way to modify them for full filtration.
Thanks,
Larry Young

[Ronnieroadster]

With some creative work you can put a spin on oil filter conversion inside the original Ford flathead canister. The original look will be maintained with the added bonus of a great filter system for your conversion. I have seen this done a few times they look great and cost almost nothing to do the conversion. When I do the 95 percent conversion I always use a Ford Motorcraft FL-1A filter they works perfectly.

[john in illinois]

Here is a thread about using the original housing for a full or 95 filter.

http://www.jalopyjournal.com/forum/t...#post-11067788

John

[JSeery]

Be sure you understand what is going on with the different types of filter systems. The by-pass style bleeds off some of the oil (and pressure) from the main oil system. If you enlarge the restrictor you are bleeding off more oil and reducing both the amount and pressure of the oil going to the engine. The oil past the filter goes directly back to the oil pan.

With what is called a 95% filter setup you are passing all of the oil (minus the oil to the rear main, thus the 95% claim) through the filter and back into the engine main oil supply passage. What you are doing is blocking the main oil passage and rerouting the oil around it, through the filter and back to the other side (just past where you blocked the main line).

Then there are 100% modifications which work basically the same as the 95% (however the oil path is considerably different). This setup filters all of the oil (there is no loss to the rear main). But again, the whole system remains pressurized.

[Cartravel]

Thanks, I like the one in the link posted, but I cannot see any of the extra fitting in the photo I posted. The conversions I've seen before had the bottom of the canister cut off with the modern filter peeking out so it could be changed.

I believe I understand the full filtration idea. I need all the oil filtered with minimal pressure drop and then sent to the oil gallery.

[JSeery]

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I have seen they type you are referring to before. You should be able to find some examples with a search. I would suggest not doing anything that involves the restrictor, go with the 95% or 100% setup.

[51 MERC-CT]

And another way to do it.

[Mike in AZ]

the one in your picture might be a dummy setup with no plumbing to it at all.....can't tell.....good luck.....Mike

[flatjack9]

That's what it looks like to me, also.

[scooder]

There is no reason a bypass (stock) system shouldn't be used on a "hot" engine. They work very well, and deserve much more respect that they are often given.
Martin.

[my4dv8]

An original by pass system will certainly work on any engine. For personal preference just change the oil more often. Obviously the 95% system is superior in filtration but either system will work it's up to you to decide how well you need it to work.

[john in illinois]

here is another way. Uses FL-1

http://www.honestcharley.com/hot-rod...il-filter.html

John

[scooder]

"95 percent filtration is better" is a matter of opinion. The bypass filter filters out much smaller debris than a regular "full flow" filter.
Personally I prefer the original system, works real good.
Martin.

[Cecil/WV]

I have 95% filtration on my '40 pickup, but I wouldn't do it again. I'll stick with the original.

[40 Deluxe]

Ford must have thought their bypass filter was OK, as my original '40 owners manual recommends to change the oil every 5,000 miles!

[flatheadmurre]

The filtration of a bypass system is excellent and you dont loose oil flow caused by filter starting to clogg up.
Downside is that anything small enough to pass the pickup screen can end up in the bearings.
Many big industrial engines have one fullflow and one bypass filter to get the best of both worlds.