Mahle MS Piston & Cylinder Set 78-89 Porsche 930 Turbo 3.3L/3.6L 98mm Bore 74.4mm Stroke – Set of 6

Name: Mahle MS Piston & Cylinder Set 78-89 Porsche 930 Turbo 3.3L/3.6L 98mm Bore 74.4mm Stroke - Set of 6 - Wyld Performance
SKU: mhlPS98-009
Price: 4569.87 USD
Availability: InStock

SKU: mhlPS98-009

$4,569.87

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Category: Piston Sets - Forged - 6cyl

MAHLE Motorsport MS Piston & Cylinder Set | Porsche 930 Turbo 3.3L to 3.4L Conversion (98mm Bore)

Upgrade your classic turbocharged powerplant with the industry standard in high-performance engine internals. The MAHLE Motorsport Piston & Cylinder Set (Part Number: PS98-009) is a premium, race-proven upgrade engineered specifically for air-cooled Porsche 930 Turbo engines. Featuring a precision-machined 98mm bore and a 74.4mm stroke, this complete set of 6 delivers unmatched structural integrity, optimized thermal efficiency, and the perfect compression profile for high-boost, high-demand applications.Designed as a direct slip-in kit for standard 3.3L crankcases, this set allows builders to seamlessly increase engine displacement to 3.4L without requiring expensive and time-consuming engine case machining.

Features and Benefits

Forged Aluminum Strength: Pistons are machined from high-strength forgings featuring specialized narrow and short skirts to substantially reduce weight, drag, and internal friction.
Proprietary Dual Coating Technology: Coated with a dry-film Phosphate lubricant to protect pin bores from galling and prevent ring groove micro-welding, combined with MAHLE’s signature GRAFAL® anti-friction skirt coating to lower mechanical noise and cylinder wear.
Slip-In Fitment Simplicity: Engineered to precise factory tolerances, allowing a clean drop-in upgrade for 3.3L cases without structural modification.
Optimized Compression for Boost: Delivers a reliable 7.7:1 compression ratio (calculated at a 1.0mm deck clearance), safeguarding your engine against detonation under heavy turbocharger load.
True OEM Longevity: Air-cooled cylinders are manufactured and honed to original equipment specifications, promoting immediate ring seating and excellent oil retention.

Vehicle Fitment

Year	Make	Model	Submodel / Engine Notes
1978–1989	Porsche	911 / 930	Turbo 3.3L (Converts to 3.4L Configuration)
1986–1989	Porsche	911	Turbo Carrera 3.3L

Note: Always verify your specific engine case register and head volume configurations prior to final assembly.

Technical Specifications

Part Number: PS98-009
Bore Diameter: 98.00 mm
Stroke: 74.40 mm
Connecting Rod Length: 127.00 mm
Compression Height: 32.80 mm
Wrist Pin Diameter: 23.00 mm
Crown Volume: 14.2 cc
Piston Weight: ~434g
Compression Ratio: 7.7:1 (Based on 90cc head volume)
Quantity: Set of 6 Pistons and 6 Cylinders

Frequently Asked Questions (FAQ)

Does this kit require machining of the Porsche 930 engine case?

No. The MAHLE PS98-009 kit is engineered as a "slip-in" design for the factory 3.3L engine blocks. It features a spigot diameter that fits directly into the stock engine case registers without requiring additional boring or machine shop labor.

Why does the description list 3.3L/3.6L if it converts to 3.4L?

The individual cylinders match the 98mm bore configuration used across high-performance Porsche performance platforms. When paired with the 74.4mm stroke crankshaft found in 1978–1989 Porsche 930 3.3L models, the exact calculated displacement increases to a 3.4-liter setup.

What are the benefits of the GRAFAL® and Phosphate coatings?

MAHLE uses a dual-coating process on these forged pistons. The Phosphate coating acts as a dry lubricant to protect the wrist pin bores and ring grooves from wear during initial start-up and high loads. The GRAFAL® coating on the piston skirts reduces friction, scuffing, and side-loading noise within the cylinder walls.

Are wrist pins, rings, and clips included?

Yes, this is a comprehensive engine kit including all matching high-performance pistons, cylinders, wrist pins, low-drag piston rings, and retaining clips required for a complete 6-cylinder rebuild.

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