Hey Virginia Firetruck.....we have drilled our blocks for the full-flow filter system and are using the -8AN fittings with 1/2" hose. It appears that Ron didn't go that direction and is running the bypass system. That's why when he bypasses the filter, his pressure comes up.
It appears that he's got the 1/2NPT fittings on the relocation mount, reduced down, but the lines are still too large for the BYPASS system to function correctly. Too much flow going to the filter, which is going to add to the normal 5-7 pound loss with the bypass system. The stock lines used with the bypass system are at most 1/8" ID and it appears that these lines are closer to 5/16" OD....which explains his pressure loss. Adding a restrictor, like Ed's 53 points out, would correct the problem.
The smaller the restriction, the more pressure he'd gain to his bearings but the less oil that would be filtered.
I agree totally with Olblue49, that the bypass system is ineffective. Bleeding pressure off the bearings for the sake of minimal filtering just doesn't seem like a prudent decision. Drilling the block for a full-flow filtering system, is going to give you 100% filtering and vastly increased oil pressure at both speed and idle.
Dave
