MADMAXX, Great thread, thanks for sharing your data. I also have the FL1 HP that was shipped with my Ford Racing crate engine but since I also will be mostly street, I will be using the Walmart sourced FL-1A.
The 400 psi burst pressure rating of the FL1 HP canister only helps the fatigue life of the can in pressure cycling. The thicker gauge steel used on the can shell gives a higher "burst rating". In racing, the peak pressures seen at the
oil filter and the frequency of the the
oil pressure cycling in the filter (30 psi to 70 psi cycling as an example) must be greater than street driven engines due to the wide swing in engine rpms in racing. So I imagine the FL1HP steel can design will out perform the standard FL1A can when tested on a pressure cycling rig to simulate the extreme
oil pressures and rapid rise and fall of the pressures in the filter can in racing. There is probably an SAE test for burst testing oil filters. It could be marketing hype, I have no racing experience nor burst oil filter experience, perhaps those that race their engines can advise what they have learned. Even a clogged filter will allow the by-pass valve to kick in to prevent a burst filter which we all agree is a bad thing.
I too have no confirmed filter (micron rating) data direct from Ford (actually the Motorcraft filters are manufactued by Purulator and/or Champion Labs last I read. OEMs will often dual source and/or switch suppliers based on you guessed it, pricing!
Check out this study made by a enthusiast ith some good info, a great read for gear heads where FL1A type aftermarket filters are examined, perhaps youve seen it.
http://minimopar.knizefamily.net/oilfilters/index.html
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