CP-Carrillo Piston Installation Orientation

CP-Carrillo Piston Installation Orientation

It's a question we get a lot: looking at a CP-Carrillo Piston, how can I tell the proper installation orientation? How do I know which side is exhaust vs. intake?

On CP-Carrillo pistons for BMW engines, the answer lies on the interior of the dome. Simply turn over the piston and look for the CP logo, which indicates the exhaust side. 

It's important to note that this rule does not apply to N63 and S63 pistons, which feature wrist pin offset. On these pistons, the arrow etched into the dome indicates piston orientation. The arrow needs to point toward the side of major thrust side of the cylinder. Read more about wrist pin offset here.

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