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Build the S55 rotating assembly around a coated 2618 forged piston package
Mahle 197879807T gives an engine builder a matched piston package for BMW S55 3.0L inline-six. Compatibility depends on the exact engine code, finished bore, rotating assembly, cylinder head, fuel, and measured clearances.
Key Features
- Set of six 2618 forged aluminum pistons
- Thermal-barrier crown coating
- Designed around the BMW S55 engine geometry
- Ring set, wrist pins, and locks supplied in the verified PowerPak configuration
Fitment
| Application Type | Verified Requirement |
|---|---|
| Engine-build specific | BMW S55 engine builds using the verified 84 mm bore, 89.6 mm stroke, 144.35 mm connecting rod, and 22 mm wrist pin dimensions |
| Year-make-model mapping | No standalone YMM fitment applies. Verify the exact engine and every build dimension before ordering. |
Specifications
| Detail | Value |
|---|---|
| Brand | Mahle Motorsport |
| Product Type | Forged Piston Set |
| Engine Family | BMW S55 |
| Bore | 84 mm |
| Stroke | 89.6 mm |
| Connecting Rod Length | 144.35 mm |
| Wrist Pin Diameter | 22 mm |
| Crown Volume | -10.5 cc |
| Compression Ratio | 10.2:1 |
| Piston Alloy | 2618 forged aluminum |
| Quantity | Set of 6 |
| Coating | Thermal-barrier crown coating |
What's Included
- Six forged pistons
- Matched piston ring set
- Wrist pins and locks
About Mahle Motorsport
Mahle develops piston systems and engine components for original-equipment and motorsport applications. Its PowerPak and diesel piston packages combine application-specific geometry with materials and ring technology intended for professionally measured engine builds.
Related Parts
- Engine bearings matched to the exact crankshaft and housing measurements
- Connecting rods and fasteners verified for the intended power level
- Gaskets and valvetrain components selected for the final cylinder-head and deck configuration
FAQ
What is the 197879807T?It is the Mahle piston package described in the Specifications table for the listed engine family and measured build requirements.
Is this selected by vehicle year alone?No. Engine code, bore, stroke, rod length, wrist pin, cylinder head, compression target, and machine-shop measurements must all agree.
Is machining required?A qualified machine shop must inspect and measure the block, bores, deck, crankshaft, rods, pins, rings, and clearances before assembly.
Are piston rings included?The What's Included section states the verified ring-set contents for this exact package.
Can parts from a similar kit be substituted?No. Pistons, pins, locks, and rings must match the exact dimensions and configuration specified for this package.
What clearances must be checked?Verify piston-to-wall clearance, ring end gaps, pin fit, deck height, piston-to-valve clearance, bearing clearances, and final compression ratio.
Is professional assembly recommended?Yes. These are precision engine components that require cleaning, measurement, balancing, correct orientation, controlled fastener torque, and documented final clearances.
What should be confirmed before ordering?Confirm the engine family, finished bore, stroke, connecting rod, wrist pin, cylinder head, intended fuel, boost level, and compression target with the engine builder.
Installation Instructions
- Confirm the package label identifies Mahle 197879807T and compare every supplied component with the build sheet.
- Have the block, crankshaft, rods, bores, deck, and cylinder heads measured by a qualified machine shop.
- Clean all components and oil passages according to Mahle and engine-builder procedures.
- Measure piston-to-wall clearance and file each ring for its assigned cylinder and operating conditions.
- Verify pin fit, lock engagement, piston orientation, deck height, valve clearance, balance, and compression ratio.
- Assemble with the specified lubricants, fastener procedures, torque values, and final inspection records.
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