Nope it has to do with the angle of drilling vs Stroke> It will just flat shut the oil off, the SBC cranks I am talking about were made by BRC when they were doing cranks in TNN. Had a small block Ford that Crower did from a Ford Forging same way it was something to do with the cross drilling and if you put a plug in the one side it would crutch it but not totaly fix it thing go wrong about 7500 to 8000 if you stayed below that RPM they would last, but above it would shut oil off and spin bearings. There is a article some where on the Internet but cna not Find it FJ Smith might come in on this, I thinkd he had a couple of these cranks.
Quote:
Originally Posted by Ed Wright
"Many smart engine builders use HV pumps so as to have enough volume later in life of the engine as clearances begin to get larger from wear."
I would have to debate the "smart" part of that statement. SBCs typically run well over 200,000 miles with no oiling issues, way more than a race engine will ever see. The factory pump has plenty of reserve capacity to compensate for wear. Pumping the pan dry? There are other problems if that happens. What actually happens is the pump bypass stays open, peeing un-needed oil right back into the pan. Heats up the oil, wears the dist & cam gears, and wears the thrust areas on the back of the cam sprocket and front of the block, wastes power. I've seen those areas really chewed up over high volume pumps in local roundy-round engines. Absolutely no need for them.
Raph, I've been doing this for fifty years now, I have never seen a crank drilled like that. But, old as I am I haven't seen everything yet. :-)
Don't think a bigger pump would be the correct fix for that.
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