Mahle Motorsports 98mm 3.5L RSR Piston & Cylinder Set – Transform Your 911 3.2 Into a Hard‑Charging 3.5

Turn your 1984–1989 Porsche 911 Carrera 3.2L into a sharper, harder‑pulling 3.5L RSR‑style engine with this Mahle Motorsports 98mm piston and cylinder set. Engineered for serious air‑cooled builds, this package combines forged pistons, Nikasil cylinders, and an 11.3:1 compression ratio at 1 mm deck height to deliver the kind of throttle response, torque, and top‑end power you expect from a competition‑inspired Porsche flat six.

Built by Mahle OE, the same name trusted for factory Porsche pistons and cylinders, this kit is designed for builders who want OEM‑grade reliability with motorsport‑level performance. Whether you’re building a fast road car, track weapon, or RSR tribute, this is the foundation that lets your cam, induction, and exhaust choices really work.

Designed Specifically for 3.2L to 3.5L RSR Conversions

Instead of adapting generic components, this set is purpose‑configured for the 3.2 Carrera crank and case:

• For 1984–1989 Porsche 911 Carrera 3.2L converting to a 3.5L RSR‑style engine
• 98mm cylinder diameter matched to the included 98 x 120 mm cylinders
• 74.4mm stroke compatibility with the stock 3.2 crankshaft
• 11.3:1 compression ratio at 1 mm deck clearance for strong, naturally aspirated power when paired with appropriate fuel, ignition, and camshaft selection

For builders and tuners working within the broader Porsche piston and cylinder category (including many 911 and 964 performance applications), this kit offers a well‑sorted, high‑compression solution without the guesswork of mixing and matching components.

Forged Pistons Engineered for High‑RPM Abuse

At the heart of this set is a full complement of forged 98mm pistons. Forging provides superior grain structure and strength compared to cast alternatives, which matters when you’re spinning a big‑bore flat six at sustained high RPM on track days or long mountain runs.

• 98mm forged pistons for increased strength and durability under high load
• 43.0 cc piston crown configuration tailored for the target 11.3:1 compression with a 1 mm deck
• 51.00mm intake and 43.00mm exhaust pocket diameters to provide safe clearance with aggressive cam profiles when correctly set up
• 49.00mm intake and 41.50mm exhaust valve compatibility to support larger‑valve performance heads

In real‑world terms, the piston design helps you run more cam and more airflow without sacrificing reliability or valve clearance, when the engine is built and measured correctly.

Matched Cylinders for Consistent Ring Seal and Longevity

A performance engine is only as good as its ring seal. This set includes six 98 x 120mm cylinders precisely matched to the pistons for uniform clearances, stable combustion, and reduced oil consumption when properly honed and fitted.

• Six 98 x 120mm cylinders engineered to work as a system with the included pistons
• Dimensional consistency across all cylinders to support even compression across the bank
• Optimized surface for fast ring bed‑in and strong sealing when assembled to spec

The result is a 3.5L engine that feels tight, responsive, and clean‑running, rather than a loose big‑bore conversion that smokes or loses compression prematurely.

Complete Set – Everything You Need to Build the Short Block Right

To streamline your 911 RSR conversion, this Mahle Motorsports kit includes all major rotating components in matched form, so you can focus on the machine work, clearances, and tuning that actually make the power.

• (QTY 6) 98mm forged pistons
• (QTY 6) 98 x 120mm cylinders
• (QTY 6) 23mm wrist pins sized for the intended conrod small end
• (QTY 1) full circlip set for secure wrist pin retention
• (QTY 1) 98mm piston ring set matched to the piston and cylinder combination

This all‑in‑one approach reduces the risk of mismatched components, simplifies parts sourcing, and helps ensure that your 3.5L build starts with a coherent, engineered system rather than a collection of unrelated parts.

Technical Configuration That Serious Builders Care About

For engine builders, the numbers matter. This set is specified to work within known parameters for high‑output air‑cooled engines:

• Conrod length: 127.0mm
• Deck clearance: 1 mm for the rated 11.3:1 compression
• Piston crown volume: 43.0 cc
• Compression ratio: 11.3:1 (at 1 mm deck)
• Stroke: 74.4mm

These specs give engine builders the data they need for accurate compression calculations, cam selection, and ignition mapping. You’re not guessing—you’re building from known, repeatable geometry.

Why Choose This Kit Over Other Big‑Bore Options?

When shopping within the broader piston category for Porsche engines—including parts commonly used in 911 and 964 performance builds—many kits look similar on paper. This Mahle Motorsports 3.5L RSR set stands out in meaningful ways:

• Motorsport‑grade design with OE heritage: You’re getting pistons and cylinders from the same engineering lineage trusted by Porsche for factory engines, tuned for high performance rather than just stock replacement.
• Purpose‑built 3.2 to 3.5L conversion package: Not a universal 98mm set, but one designed around the 3.2 Carrera stroke and deck geometry used in RSR‑type builds.
• High‑compression, naturally aspirated focus: 11.3:1 compression is ideal for a strong NA engine when matched to appropriate fuel, cams, and tuning—no need to compromise compression with a “one size fits all” design.
• Complete, matched components: Pistons, cylinders, pins, rings, and circlips are all designed to work together, cutting down the time you spend cross‑referencing and measuring incompatible parts.

Who Is This 98mm 3.5L RSR Set Ideal For?

This Mahle Motorsports 98mm piston and cylinder set is an excellent choice if you:

• Own a 1984–1989 Porsche 911 Carrera 3.2L and want a substantial, well‑engineered power increase
• Are building an RSR‑inspired street or track car that needs strong midrange and a hard‑pulling top end
• Value OE‑tier reliability but want substantially more performance than a stock rebuild
• Are an engine builder who wants predictable, repeatable results with clearly defined specs

Within the high‑performance Porsche piston and cylinder segment, this kit gives you a clean, proven path to a larger‑displacement, high‑compression engine without sacrificing the longevity and drivability that make air‑cooled cars so enjoyable.

Real‑World Benefits You’ll Notice

• Stronger low‑ and midrange torque from the increased displacement
• Sharper throttle response thanks to the high compression and forged piston design
• Higher potential horsepower ceiling when paired with appropriate cams, intake, exhaust, and tuning
• Stable, repeatable performance from a matched piston and cylinder system instead of pieced‑together components

If you’re serious about turning a 3.2 Carrera engine into a responsive, hard‑revving 3.5L RSR‑style powerplant, this Mahle Motorsports 98mm piston and cylinder set provides the engineered foundation you need—combining OE‑grade reliability with the performance potential that dedicated Porsche enthusiasts expect.