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Piston Assembly — Buick LE5, LE9, LAF 2.4L (12611362, 12643171)
Piston Assembly — Buick LE5, LE9, LAF 2.4L (12611362, 12643171)
Piston Assembly — Buick LE5, LE9, LAF 2.4L (12611362, 12643171)
Piston Assembly — Buick LE5, LE9, LAF 2.4L (12611362, 12643171)
  1. Piston Assembly — Buick LE5, LE9, LAF 2.4L (12611362, 12643171)
  2. Piston Assembly — Buick LE5, LE9, LAF 2.4L (12611362, 12643171)
  3. Piston Assembly — Buick LE5, LE9, LAF 2.4L (12611362, 12643171)
  4. Piston Assembly — Buick LE5, LE9, LAF 2.4L (12611362, 12643171)

12611362 Piston Assembly for Buick LaCrosse CW2 2.4L LE5 Engine

The Buick LE5, LE9, and LAF series 2.4L Ecotec engines feature lightweight aluminum piston assemblies with an 88 mm (3.46 in.) bore. The skirts of these pistons utilize targeted jet cooling technology, effectively reducing friction and noise. They are specifically designed for high-compression, direct-injection applications, typically featuring a compression ratio ranging from 10.4:1 to 11.4:1.

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Description

Piston Assembly Key Specifications:
Bore: 88 mm (3.46 inches)
Material: ZL109 Cast Aluminum Alloy
Cooling Method: Directional Oil Jet Cooling (targeting the piston crown/skirt)
Compression Ratio: Typically 10.4:1 to 11.4:1
Piston Ring Type: Molybdenum Rings (commonly found in 2009–2010 and later models)

Specific Engine Specifications:
LE5: Commonly utilized in early 2.4-liter models; features a slightly lower compression ratio.
LE9: Typically equipped with direct injection technology and VVT (Variable Valve Timing); this model is quite similar to the LE5/LAF series.
LAF: Specifically designed for direct injection technology; features a higher compression ratio of approximately 11.4:1.

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