[Jack Gifford]

In my lakester engine (blown alky hemi four) I'm considering adding nozzles aimed at cylinder walls below the pistons- which would also strike the undersides of pistons through part of their stroke.. The nozzles would receive full-time oil pressure, nominally 100 PSI. One reason is for piston cooling. The other reason is for better cylinder wall oiling. Prior to the just-finished rebuild, the pistons were badly scuffed (anti-friction coatings gone) and two were cracked. I'm not sure of the cause, but there are a couple of suspects. One is possible lack of cylinder oiling, due to extreme oil control measures (no cam in block to bleed oil, full-round crank counterweights to eliminate leading/trailing edges, crank scraper, efficient windage tray, and oilpan kickout)- and DOHC oiling is a separate drysump system. The other suspect is the finish of the bores in the steel sleeves (done per Smokey Yunick's "the smoother the better" edict), which might not retain oil well enough. So... in any case, I think dedicated cylinder wall oiling would be wise.
I don't know what volume of oil flow to shoot for- any suggestions? Or as a shortcut, any idea what orifice size for each of the four nozzles?