Another more effective method is to put some pin oiling holes in the pistons. This is an option that many custom piston companies offer as an upcharge, but its worth doing to ensure you have positive pin oiling at all times. Having slots or even spit holes in the rods doesn't really do a good job because the rods are constantly oscillating and never really directing the spray where it needs to go. Another alternative for spraying oil to the underside of the piston crowns for cooling is a method that Porsche used in many of its 24 Hour races at LeMans and other long endurance races. It was basically similar to a gas jet in a Holley carb that intersected the main oil galley in the main bulkhead of the block. It was fixed at a slight angle so it constantly sprayed oil at the underside of the pistons throughout the entire 360° of rotation and is never blocked or obstructed by any of the other engine components. They stated that it cooled the piston crowns temperature by over 400°F, and saved many engines from failures during these races where the engines endured those long hours of constant full throttle high boost situations.



Class III CNC Machinist/Programmer