Oil pressure

[bobcowan]

Originally Posted by SBSerpent

No oil cooler.

Does the brand or size of oil filter affect pressure?

Yes. In a Windsor engine, the oil goes from the pump directly to the filter. The stock oil pressure sender is after that.

A cheap (Fram), clogged, or too small filter can be restrictive. The pump is pushing against the restriction, and that increases the pressure enough to open the relief valve. Everything after the filter then has a lower pressure, and a lower flow.

I prefer either the Motorcraft FL1-A or a Purolater Pro-1 filters.

[SBSerpent]

That being said, is it best to always go with a longer (higher capacity) filter than a shorter (lower capacity) filter?

[cycleguy55]

Originally Posted by SBSerpent

That being said, is it best to always go with a longer (higher capacity) filter than a shorter (lower capacity) filter?

A higher capacity filter is capable of filtering more contaminants before its internal pressure relief valve opens and oil bypasses the filtering media. So, yes, generally a longer filter is preferred to a shorter filter - all else being equal.

BTW, Wix 51515 is a good filter, equivalent to Motorcraft FL-1A IMO.

[SBSerpent]

Yes, the 51515 is what I am using. I had swapped out to the WIX 51068, which is almost an inch shorter in length but then figured I didn't need to because the 51515 fits between the motor and frame no problem.

[patrickt]

If you're worried about low oil pressure then you should buy an FE. With FEs, there's no such thing as low oil pressure. See: Oil Temp 265 Degrees and Pressure Only 9 PSI -- Did Ford Say That Was OK for a 427?

[Lou1119]

Originally Posted by bobcowan

Yes. In a Windsor engine, the oil goes from the pump directly to the filter. The stock oil pressure sender is after that.

A cheap (Fram), clogged, or too small filter can be restrictive. The pump is pushing against the restriction, and that increases the pressure enough to open the relief valve. Everything after the filter then has a lower pressure, and a lower flow.

I prefer either the Motorcraft FL1-A or a Purolater Pro-1 filters.

I installed an Oberg oil filter setup on my Roush 427. Better flow increased pressure and is cleanable. These are the same filters used on NASCAR machines , NHRA fuel dragsters. More expensive but they are reusable as long as you own the engine. Check it out a Oberg Industries

[Lou1119]

Originally Posted by Lou1119

I installed an Oberg oil filter setup on my Roush 427. Better flow increased pressure and is cleanable. These are the same filters used on NASCAR machines , NHRA fuel dragsters. More expensive but they are reusable as long as you own the engine. Check it out a Oberg Industries

It is not Oberg industries. Look up Oberg oil filters.