Originally Posted By: ZeeOSix
Originally Posted By: 69Torino
And someone also asked why the Fram HP doesn’t have the Ultra media inside. This is simple. Lots of race engines have high volume oil pumps installed. The Ultra media is designed to be efficient on street cars with normal (stock) flow rates. There is always a trade-off with anything in life. You can’t have your cake and eat it too. Some guys refer to Racing filters as “rock catchers”, and the truth is not far behind that term.
Per numbers obtained from Motorking posted in this forum, the Ultra flows very well - somthing like only 4~5 psi with 12 GPM of hot 30 weigh oil flow. A real "rock catcher" (ie, a screen mesh reusable race filter) might have half that, but as said before that's only a 2~2.5 psi difference at max flow, which isn't enough to really matter to the engine. My bet is the Ultra flows just as well or better than a regular WIX/NAPA Gold since it's full synthetic.
The Fram HP series racing filter is far from a "rock catcher", it's slightly less efficient than the Ultra, and much more efficient than the XP/Platinum. The HP has many more differences for racing duty than just the media.
The Ford Racing Performance filter is almost as efficiency as the Ultra (98~99% at 20u), and flows very well. The Ford racing filter data sheet has been posted many times over the last couple of years, and even shows the "flow vs delta-p" curve.
"Racing filters" might have been "rock catchers" (ie, 50% at 20u or worse) back in the old days, but some are not these days.
Thank you kindly for your additions to the discussion. I use the Ford Racing version of the FL-820S on my Marauder most of the time, because of these facts. Truly a hidden gem of a filter, and it also has the thread end bypass that the Ford mothership likes. (I like it too. Far superior design/placement).
I did not realize the Fram HP line had decent efficiency. I guess it’s the Wix part numbers that end in “R” that are still the kitchen strainers. But then again, some people care much more to flow oil in quantity, such as in alcohol fueled engines that murder oil filters. These engines get torn down regularly though.
Again, thanks for the insight.