Mahle Forged Piston & Cylinder Set | VW Type 1 | 90.5mm × 82mm 2110cc Stroker (98-1991-B)

Mahle Forged Piston & Cylinder Set — 90.5mm × 82mm Stroke, 2110cc Stroker | VW Type 1 (98-1991-B)

A 2110cc stroker gets you well past 2.0 liters on a 90.5/92mm case bore, and this Mahle forged 90.5mm × 82mm set (98-1991-B) brings forged strength to a demanding long-stroke combination.

Vehicle Fitment

• VW Beetle: All years, air-cooled Type 1 engine.
• VW Super Beetle: All years, air-cooled Type 1 engine.
• VW Karmann Ghia: All years, air-cooled Type 1 engine.
• VW Bus (Type 2): All years, air-cooled Type 1 engine.
• VW Type 3 (Squareback, Fastback, Notchback): All years, air-cooled Type 1 engine.

Why Choose Mahle?

Mahle forged pistons are forged, not cast, for strength under heat, boost, and nitrous — built for high-output street, race, and off-road use.

Key Features & Benefits

• Displacement: 90.5mm bore × 82mm stroke = 2110cc displacement
• Forged pistons: Mahle forged pistons — forged, not cast, for strength under heat, boost, and nitrous
• Thick cylinder walls: extra-thick cylinder walls for added strength and cooling surface
• Complete set of 4: cylinders, forged pistons, rings, wrist pins, and clips
• Crank: Pairs with an 82mm stroker crank

Technical Specifications

• Bore: 90.5mm
• Stroke: 82mm
• Displacement: 2110cc
• Piston: Mahle forged aluminum alloy
• Cylinder: Cast iron, extra-thick wall
• Sold as: Complete set of 4 (includes rings, pins, clips)
• Brand: Mahle (distributed by EMPI)
• Part Number: 98-1991-B

Frequently Asked Questions

• Does this fit my air-cooled VW Type 1? Yes — it fits Beetle, Super Beetle, Karmann Ghia, Bus (Type 2), and Type 3 engines once the case (and heads, where required) are machined for this bore.
• Are these forged or cast pistons? Forged — Mahle forged pistons, built for high-output street, race, and off-road use.
• Do I need a stroker crank? Yes — this is a stroker set; pair it with an 82mm stroker crank.
• What's included? A complete set for one engine: 4 cylinders, 4 forged pistons, rings, wrist pins, and clips.
• What's the part number? 98-1991-B.

Installation

• Machining required: case must be cut for 92mm. Heads typically need 94mm-style spigot bore — confirm with your machinist.
• For best results, use Teflon/poly piston-pin retainer buttons.

Explore Related Categories

Engine Parts, All VW Air-Cooled, Mahle

WARNING: This product can expose you to chemicals known to the State of California to cause cancer and reproductive harm. For more information, go to www.P65Warnings.ca.gov. All parts legal for use on pre-pollution-controlled vehicles only.