I've actually looked it up a fair amount, but I guess never really posted that info up here, just mentioned it a bit a few posts back.
Going off the mains is what I'd really like to do, like this, but I'm not willing to trash a block to test how thick the casting is around the main passage. If I accidently trash a block or break one down the road I'll use that opportunity to check it out. [img]http://forums.drom.ru/attachment.php?attachmentid=926597&stc=1&d=1269782157[/img]
This method is clearly cruder, but it will at minimum promote slinging oil towards the piston on the upwards stroke, but volume will be needed for significant cooling, but a slight spray will be adequate for pin lubrication.
Since I have these pistons with window's now, I'm going to review running a tube "second" oil main for piston oilers. The perk to running a second external line is a pressure valve could be installed so it only pressurizes up when the rpm's/pump is wound up so it's not bleeding oil pressure at low rpm's/oil pressure, but space is limited in the crankcase.
