FL-500s

[Zeusmotorworks]

Not sure... I'm a wrench puller not an engineer. I've also heard the filtering material is better on the 500. However, I can't rememeber if that is because it filters down in microns or just the physical properties of the element itself.

 

[Stroked out]

It looks like the valve is on the dome side on the 500 . 820 appears to have the valve on the screw side. Does this give you more filtered oil at start up? Idk , my old skool thinking wants a larger filter but is it good on cold starts?

 

[Zeusmotorworks]

Soooo more always sounds better. However, in this case, I'm afraid that extra oil volume may not be the true deciding factor. And truthfully, there are a ton of these engines lasting a very long time on the OE spec'd filter so how much real value would there really be if the larger filter was not causing additional wear? I mean the whole idea was to "improve" the system, right?

 

[FordTechOne]

Looks like the FL820 has a 16 PSI bypass vs the FL500S which has an 8 lb bypass. The FL500S would bypass more on cold starts. Could the FL820 not increase in engine wear? Maybe @FordTechOne has a better answer about using that filter.

The filter bypass operates based on the inlet to outlet pressure differential, not the pressure being provided to the filter by the pump. So if the filter were to become restricted, oil will bypass the media when the inlet pressure exceeds the outlet pressure by the specified the bypass rating.

Since the larger filter contains more media and therefore operates at a higher pressure differential, the bypass rating is higher. This prevents oil bypassing the media during normal operation.

The engine is designed and tested with the factory specified filter. I would not recommend deviating from that spec.

 

[FordTechOne]

Ponder this, I am no expert just trying to keep things simple. If the 820 holds twice as much oil as the 500, ( not claiming this as fact), if one cycles at 8psi and the other at 16, would they not be filtering the same amount of oil?
But the 820 would have a larger filtering surface area? @FordTechOne ?

Neither will be cycling their bypass valve unless they become restricted, at which point there is most likely engine damage. See my explanation on the bypass valve operation in my previous post.

Both will filter the same volume of oil. The larger filter just has more media, which allows it to hold a larger volume of contaminates.

 

[Eship]

Very interesting. Will have to inspect mine as well.

 

[Johndeere99]

Neither will be cycling their bypass valve unless they become restricted, at which point there is most likely engine damage. See my explanation on the bypass valve operation in my previous post.

Both will filter the same volume of oil. The larger filter just has more media, which allows it to hold a larger volume of contaminates.

Thanks for your input, it is always appreciated. I believe and understand that your recomendation is the 500. However i see no down side to running the 820 per your explanation of how the system works. Am I missing something?

 

[FordTechOne]

Thanks for your input, it is always appreciated. I believe and understand that your recomendation is the 500. However i see no down side to running the 820 per your explanation of how the system works. Am I missing something?

Based on the bypass valve ratings, the larger filter is somewhat more restrictive. Since the engine oiling system was designed with the stock filter, I wouldn’t recommend deviating from that.

 

[nikhsub1]

I use the CM-6731-FL820 as Ford Performance says it is a direct upgrade for the 500... Expensive but it's a big beast and fits no problem.

FORD RACING HIGH PERFORMANCE OIL FILTER

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