I am glad to see this discussion develop into technical dialog.
There seems to be 3 very different approaches to delivering oil to the IMSB. List in alphabetical order.
1. EPS (IMS Bearing Upgrade Kit) Cylindrical Roller bearing oil delivered through the oil pump shaft by modifying the shaft during installation.
2. Flat6/L&N, and Jake Raby (IMS Solution) Has removed the Bearing and oil delivered from spin on oil filter to IMSB flange through braided line.
3. Pedro’s (DOF) Roller bearing, from unused port in engine casing to IMSB flange through braided line.
I was very curious about the difference between Jake Raby’s and Pedro’s. Both deliver oil through braided line to the flange but from completely places. Last weekend I sent Jake an email asking why he choose his design as the DOF seemed a simpler way to get oil to the flange. He responded back rather quickly which was impressive. Here is his response to why do he pulls the oil from the filter.
I developed a system similar to the DOF many years ago, it never impressed me, and therefore it was not marketed.
That said, the oil that I collect for the IMS Solution is taken directly from the oil filter, it is JUST FILTERED OIL, and it has the highest volume, fastest priming, and highest pressure of any portion of the engine, because this post is the first orifice past the main engine oil pump. The DOF takes oil from where it does, because my first US Patent includes the Spin on Filter Adaptor method, so the DOF had to source oil elsewhere to reduce the infringement possibilities on this Patent.
United States Patent: 9416697
Review this here:
Layshaft end bearing retrofit with external positive oil pressure delivery
Single Document
That said, the reason I pick up oil where I do, is because I understand the fundamentals of this engine much more than the oil system diagram from Porsche. Pulling oil from the cylinder head is a way to see oil pressure which has already been reduced by the bypass system, and to collect unfiltered oil that has already passed dynamic components. This is NOT just filtered oil; therefore, it can present, and feed directly into the IMS Bearing, debris laden oil. Been there, done that years before anyone else had even extracted an IMS Bearing.