Why is lubricant spayed onto the underside of aluminum pistons?
A) To assist in keeping piston crown temperatures lower.
B) To lower ignition temperatures.
C) Because moving cylinders provide splash circulation of oil.
D) It is the only method available to lubricate wrist pins.

Question

Quizplus · Accepted Answer

Lubricant is sprayed onto the underside of aluminum pistons to assist in keeping piston crown temperatures lower. This helps to prevent preignition and detonation, which can cause engine damage.

Why Is Lubricant Spayed onto the Underside of Aluminum Pistons