The 36HP air cooled VWs were a non rotating lifter. Not that any may care, but just for historical information.
The use of instant 2,000 RPM was used in engines with high spring pressures and in non-interference engines. Even if someone had pre over-pumped lifters they would probably do no harm.
I fooled with SBCs and always turned the oil pump before the engine ever turned over, to make sure the oil was everywhere it was supposed to be. I also used cam lube and did use moderate high idle speeds (about 2000 RPM to break-in cams. I was using a Duntov solid lifter 1010 and had no problems. I usually had everything set at fire up time: valves, timing, all fluids full and double checked. I would start up elevate speed, re-check water level and hit the road for ring break-in. Was I right? I do not know, but I had no failures.
The conflict in the VW TDI PD comes with the inability to set valve clearance before start up. The first short time that oil pressure is up, usually normalizes the clearance issue. If you go to 2,000 RPM you could have some pretty good valve clatter the first few seconds (but no valve piston contact if everything is ok). The idle time VW chose is to make sure no piston valve contact happens and no severe valve clatter happens. IMHO... There are conflicts in the PD: no way to set valve clearance and need for elevated RPM for follower break-in (silver top followers ?).
Peace
eddif
The use of instant 2,000 RPM was used in engines with high spring pressures and in non-interference engines. Even if someone had pre over-pumped lifters they would probably do no harm.
I fooled with SBCs and always turned the oil pump before the engine ever turned over, to make sure the oil was everywhere it was supposed to be. I also used cam lube and did use moderate high idle speeds (about 2000 RPM to break-in cams. I was using a Duntov solid lifter 1010 and had no problems. I usually had everything set at fire up time: valves, timing, all fluids full and double checked. I would start up elevate speed, re-check water level and hit the road for ring break-in. Was I right? I do not know, but I had no failures.
The conflict in the VW TDI PD comes with the inability to set valve clearance before start up. The first short time that oil pressure is up, usually normalizes the clearance issue. If you go to 2,000 RPM you could have some pretty good valve clatter the first few seconds (but no valve piston contact if everything is ok). The idle time VW chose is to make sure no piston valve contact happens and no severe valve clatter happens. IMHO... There are conflicts in the PD: no way to set valve clearance and need for elevated RPM for follower break-in (silver top followers ?).
Peace
eddif