I am starting this as a brainstorming session to have all of you jump in with ideas.
so here it is,
I bought a 4 cyl core a while back to play with it (some of you might have seen the roller rockers thread i have in "Member's Projects"). Took the engine apart and I was surprised to see that there are no piston cooling nozzles or jets in this motor. Most common way I've seen this achieved is to have a sized hole on the connecting rod that would spray oil onto the underside of the piston when the oiling hole in the crank lines up with it. For more demanding applications there are permanent spraying nozzles that are constantly spraying oil onto the piston but they have a pressure relief valve that opens only past a certain oil pressure level (for obvious reasons to avoid starving the cam and crank bearings of oil at low rpm) - these are usually found on diesels/turbo-diesels, air-cooled engines or turbo/supercharged applications. Also some high performance n/a engines with high CR have these spraying jets. At a minimum i saw the sized hole thru the connecting rod.
Thinking ahead of my supercharger installation, and how to allow for more boost - one thing i am planning to do is to increase the dish volume to lower the CR, but without piston cooling and with the piston dish thickness reduced it is an accident waiting to happen in terms of melting the piston or seizing it in the cylinder due to overheating the piston (or many other catastrophic scenarios)
So, what would you do to implement some sort of piston cooling - I would prefer the permanent nozzle/jet that sprays constantly over a certain pressure, i did think of actually drilling the rods but it will just give it a quick squirt once every crank rotation.
looking forward to your suggestions folks...
