I've started putting one of the "core" short blocks to use. I took the junkiest looking 230 in the collection and decided to use it for some piston oil squirter experimentation. I had kind of walked away from the idea, but since I now have something like 34 spare connecting rods, I figured I could sacrifice three or four for testing, and likewise for the cast 230 pistons. Another motivation is I'm starting to get nervous about piston pin oiling as I'm pulling a fair amount of crankcase vacuum and with at least one block I'm pulling the return oil completely away from the crankshaft, so to throw some oil up that way would help in that area.

Taking this idea and trying to implement it on the OHC engine. The thing I like about this design is they are always pointing at the bottom of the piston, aka parallel to the rod. However I am skeptical of their effectiveness since they are essentially after the oil is cast off from the rod bearing I am unsure how much pressure it will actually have there to make the distance to the piston. After some more googling, I was shooting for ~1/16" notch since I really want volume for cooling the piston.



The second step is to actually be able to see how effective it is, so I took two pistons, drilled a couple holes in the crown then saws-all'd the openings larger so I could see how effective the spray pattern is at different oil pressures. So I've modified one rod, the other is for the next test, and by the time I smoothed out the cut edges the opening was a bit bigger than I wanted, but will see how it performs anyways. It does not intersect the bearing shell at all, so I didn't have to modify the bearing. Unfortunately when I went to test it the oil pump wouldn't take a prime so I primed it and then oil leaked around the oil pump base, so I tightened the bolts on the base plate and the gears wouldn't move. Turns out it's a pump I've disassembled and didn't put a gasket back on. I have a stack of pump gaskets, but at that moment I didn't feel like making an oily mess pulling the pump plate off so called it the day. Maybe today or tomorrow I'll get back to it. I will likely also have to replace the pressure relief spring to get over 35psi of pressure, but since it's external its an easy modification.

Looking down through the piston. I put the notches on the front side, figuring as the vehicle is accelerating the spray will move rearwards. No getting around those physics. Interestingly enough this block has the old style small "Chevy style" rods in it. Still forged, just less material around the big end.
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