My hemi rods have no holes to oil the wrist pins, is this correct and would it hurt to add a hole, mine have bushings.
The machine shop that resized and rebushed my 331 Hemi rods said that oil holes are not needed. I too thought holes would be a good idea. There were no holes from the factory. I trust the machine shop. They do top work. Bill
Do the pistons have oil holes? If it is a press fit in the rod it does not want an oil hole, if it is a bushed free floating pin and is held in by keepers then I would think that it wants to get a little oil from somewhere. I very seldom make a hole that didn't come from the factory.
Just make sure the rods are balanced correctly after all the machining work is done if you do decide to add those... Every gram counts!!!...
I never added oil holes on bushed rods, yes if no bushings, if you want peace of mind just drill a .060 in the top of the rod and chamfer the hole slightly, make certain you also clean up the inside of the wrist pin hole so there are no burrs left behind in the drilling process I've never seen a rod fail on the small end so I doubt it will weaken it at the point of the hole. Have fun
Yes, but what if the balance pads are bigger on some rods??? Your taking out more stock to drill into the wrist pin diameter... I'd still double check all the "small ends" after the machine work is done..
Much better with the add'l pin-oiling, if you have the option! The (2) oilers belong on the bottom of the pins in the rods, one on each side of the beam below the "eye", and above the pins on the pistons. These are the highest load areas! You will find some mfrs put a single hole in the rods above the eye, not as efficient, better below with the 2 holes! Even most of the "off-shore" (Chinese) rods have both holes below the pin eyes, it's just the best way. (Add) Those small oiling holes will have NO effect on the balance job integrity! Thanks, Gary P.S. If you choose to not use this setup (no pin-oiling) make certain to have between .001" and .0015" clearance between the pins and the rods and a minimum of .001" between the pistons and the pins!
i would not put a hole in the beam of any rod. a 4 and 8 or 12 o'clock drilling into the bushing is normal.