WHAT WOULD BE WRONG WITH MACHINING A GROOVE IN THE CAMSHAFT JOURNALS, ONE GROOVE FROM THE OIL GALLERY, AND MAKING THE EXHAUST OIL SUPPLY HOLES SLIGHTLY BIGGER? JOHNO
making the exhaust oil supply holes bigger won't do much as the restriction is in the block with a little restrictor to the camshaft. The lifters oil supply have a check valve in the block which acts also as a restrictor. Machining oil grooves in the cam journals is not a problem but not needed as I've never seen/read issues with oil supply to them. It would be easier to machine the journals out bigger and use bearing shells with grooves already in them.
CAMSHAFT THANKS CHEWY@WORK I AM ABLE TO USE SERIES 6001 ROLLER BEARINGS DIA28 4OFF AND DIA12MM BRIGHT BAR WITH 4MM DRILL SHARPENED AS A CUTTER AND CONTAINED BY A 3MM GRUB SCREW TO LINE BORE GROOVES INSITU. I SEIZED EXHAUST CAM LEFT BANK FRONT JOURNAL AND STRIPPED BELT. I HAVE A SUSPICION THE OIL GALLERY BECAME CLOGGED.
what size are you boring the exhaust cam journal oil holes ? Too big and you will loose pressure that helps the camshaft run on a thin film off oil rather on the alloy journals. I'm about to put in a high volumr Toga oil pump to help get a better supply of oil in the heads since I want to rev it out to 8000rpm.
cam holes are approx dia 1mm, plan on changing to dia 1.5mm with a groove from the hole around journal approx 0.25mm deep
Inlet cams weak The factory inlet cams are weaker than the exhaust and not just because they are hollow. I have four exhaust cams reground for this reason.
