Originally Posted by pomansouth
just a question, how does an oil squirter that is pointing at the bottom of a piston, keep heat off of a bearing that is below the oil squirter? From my origional understanding, they were meant to keep the pistons cool and only come in useful if the motor is run at high rpm's for extended periods of time.
Well the heat from the top on the piston has to go somewhere right? It goes through the rod bearing down the connecting rod and through the main bearings and into the block where the coolant takes it through the radiator and gets rid of it into the air. If that heat transfer isn't efficent it'll build up at some point and overheat the thin layer oil that the bearings use to work. The oil squirters help to get rid of some of that heat by using the oil to cool the pistons. A lot of the heat from combustion is transferred into the pistons and it has to go somewhere.