The 1.8L pistons apply a floating-pin design. The wrist pins, which attach the piston to the connecting rod, "float" inside the rod bushing and pin bores in the piston barrel. Compared to a conventional fixed pin assembly, in which the connecting rod is fixed to the piston's wrist pin and the pin rotates in the pin bore, the floating pins reduce stress on the pin. They allow tighter pin to pin-bore tolerances and reduce noise generated as the piston moves through the cylinder. The benefit is less engine wear, improved durability and quieter operation.
The 1.8L's pistons also have oil-spray cooling. Each piston has its own individual directed jet that sprays oil toward its skirt, coating its underside and the cylinder wall with an additional layer of lubricant. The extra lubrication cools the pistons, reducing friction and helping ensure durability. Additional oil on the cylinder walls and wristpin also dampens noise emanating from the pistons.