rocker arm oiling HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
ok the here is what I have done I have drilled right into the left side oil passage thought the oil feed to the head with a .250 drill and cut off oil supply from cam by drilling 1/8" in between two holes of the cam bearing and install so it lines up with mains all done so mains and rod don't starve and went with a an-4 cross over to right side I all so done all the other oil passage mods including the an-6 lifter galley mod with the #1 left main block off and it now is feed by the right side I know from building small block chevy race engines with shaft rocker that full roller rocker use more oil but they oil though the push rod I just want to know what size is too big and I'm not going to debate my decision that being said WHAT IS TOO BIG!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Can someone tell me what this accomplished? The number 3 rod doesn't run out of oil because the rockers are fed off the number 2 Rod bearing. Otherwise, number 7 would be hanging off with it.
Don't know what RPM your turning, but at 7800 things start going south. By 8500 it won't oil the number 3 rod. The cross over doesn't fix that.
Ive posted it before, but why will a Chevy turn RPM until they bury the tach and not blue a bearing? Because Chevy has the oil TIMING to the rods correct. Chrysler does not. As RPM goes up, the oil feed holes are lined up for a smaller amount of time. Also, since the time the oil is getting to the Rod is less, it also makes the time the oil feed holes are supposed to be lined up actually gets later.
Saying all that, what I'm saying is decades of testing has shown that you need full pressure, full flow oil to the rods when the piston is about 70* ATDC. That number varies a bit depending on Rod ratio, but that's it.
If you measure a Chevy that's where it is. Look at a Chrysler. It gets the oil there too early. That's why running full groove bearings help. It puts oil to the rods all the time. It won't make a crank live at 8500, but it helps.