After reading through the archives on cam oiling I thought i would do my own research on this subject. I wanted to prime my engine with oil before starting so I thought it would be cool if i could see this in action plus verify my spray bar is working correctly. When i rebuilt my engine I had the spray bar cleaned with everything else, but I have been skeptical of those little hole getting clean. The cam is an internally oiled, but I was going to use the spray bar also.This was another reason to look at things a little closer.
So I found an old oil pump shaft from another car that would work and used a variable drill that had a 2800 max rpm to rime the motor . I used aluminum tape to make a barrier around the head.This actually worked very well to keep the oil in, just make sure you get the head perfectly clean so the tape sticks well to prevent leaks. (pic#1)
What I found was that i am glad I did this test. With the plug in the end of the cam the oil shot out of the lobes more then i thought it would.(pic #2) I kept the drill speed low probably 1000rpm and the pressure was always good coming out of the lobes.And with the plug in there was still decent oil coming out of the spray bar. With the plug out, the oil pressure from the spray bar increased but not as much as you would think, and the oil was still coming out of the lobes but not with any pressure.(pic#3) I think a compromise could be made by drilling the plug to lower internal pressure and maintain spray bar pressure
The biggest find was that my "cleaned spray bar" was not putting oil out on some of the lobes.(pic#4) So I did what many have recommended and ordered a new one. The oil pump I am using is supposed to be a high volume pump I bought off of e-bay but there is no way of proving this. When I get my new spray bar I will continue this with some more pics . Hopefully this will fix the lack of oil from the spray bar.