MAHLE 42077CP.020 Premium Piston Ring Set +.020" Oversize Ford Duratec L4 2.0/2.3L DOHC

The MAHLE 42077CP.020 is a premium-grade piston ring set engineered for Ford Duratec inline-four 2.0L and 2.3L DOHC engines. This set is sized at +.020" oversize, corresponding to a 3.465" bore diameter, making it the correct choice for engines that have been bored or honed during a rebuild. MAHLE is a globally recognized OE supplier, and this ring set is built to meet or exceed original equipment form, fit, and function.

Ring Construction & Materials:

• Upper Compression Ring (UCR): Ductile iron construction with a plasma-moly facing for rapid break-in and reduced cylinder wear
• Lower Compression Ring (LCR): Cast iron with a barrel-faced contact area for efficient compression sealing and reduced blow-by
• Oil Control Ring (OCR): Stainless steel CP-20 assembly with chrome facing and an exclusive 20-degree ear angle for superior side seal against the cylinder wall
• Ring axial heights: UCR 1.5mm | LCR 1.5mm | OCR 4.0mm
• Ring types: UCR RF-18PF | LCR RBT-10 | OCR CP-20

Key Features:

• Pre-lapped at the factory for immediate seating and minimal break-in time
• SAE 9254 high-alloy steel base material delivers increased tensile strength, fatigue resistance, and material hardness
• Compression rings feature a barrel-faced contact surface for more efficient sealing and a CNC-controlled gap chamfer to reduce blow-by
• Intermediate rings use a reverse-twist design for enhanced groove side sealing and taper-race machining for improved contact
• CP-20 oil ring expander features a special chemical polish for enhanced oil drain-back
• Ring tension, materials, and coatings optimized per application for reduced friction and extended service life

MAHLE Original piston ring sets are the preferred choice for professional engine builders seeking OE-quality reliability in a rebuild application. This complete set includes rings for all cylinders, making it ideal for a full engine overhaul.