[Jay S]

The squirter’s do not directly spray at the cylinder wall. If you did, your trying to do something different than how a pistons squirter (piston cooler) is meant to operate. The goal is to cool the pistons. The Squirters must hit the underneath side of the piston.

Newer style Diesel pistons have oil cooling passages inside the underneath side of the pistons. The squirters are positioned to hit the port holes for those oil passages for even more piston cooling.

Older types pistons with no cooling port (like a gas engine and most older diesels) just sprayed the bottom of the piston for extra cooling. Long hard pulls it keeps the pistons from expanding, the pistons last longer, less scuffing from less expansion. The oil acts as a heat sink, it is not for lubrication.