I’m building the Ohrndorf 5 cylinder radial, which is a glow ignition, methanol / oil premix fuel system. https://www.engineman.de/en/products-page/plaene/plan-5-zylinder-sternmotor/ The lubrication system is kind of 2 systems. Induction comes via the rear carb, through the manifold plate & enters the CC horizontally. Therefore a healthy lubricating mist covers the master rods, crankpin, connecting rods etc. before it is redirected back into the rear manifold, up the induction tubes & into the heads. The front nose cases houses the ring gear assembly, cam plates & pushrod lifters. The lifters slide up & down within their bronze bushings. The nose is case bolted to a front plate which in turn is bolted to the CC. The front nose section has an O-ring on its perimeter & is sealed off from the CC. The nose case is partially filled with oil so basically the cam parts & gears are splashing in a bath. So far so good. This lubrication system is replicated on the larger Ohrndorf 9-cylinder so I have every reason to believe it works. He defines a volume for the ‘engine oil’ (10-15 cc in the 9-cyl) which makes me believe at least the bottom third of cam plate is submerged. He doesn’t define oil viscosity but I assume it can’t be too thick without causing drag issues. The issue is, I can’t see how oil is not going to gravity feed migrate from the nose case bath, out through the bottom 4 lifters, meaning the annular gap between the lifter rod & it’s bushing. There are provisions for pushrod tubes which fit over the lifter bushing, but that just means oil would continue down the pushrod tube into the lower valve cover area. The lifter/bushing must be sliding fit between them. I could extend the length of lifter bushing into the nose cavity a bit to try & keep a volume just below the spill point. But I have to think it’s going to get slung around. Another option is to deviate from the plans. I could modify the front plate, make passage holes so that the previously mentioned inlet charge from the rear is allowed to continue forward through the CC & also mists over the cam components.