Mahle Forged Piston & Cylinder Set | VW Type 1 Air-Cooled | 90.5mm × 69mm 1776cc (98-1990-B)

Mahle Forged Piston & Cylinder Set — 90.5mm × 69mm Stroke, 1776cc | VW Type 1 Air-Cooled (98-1990-B)

1776cc is the most popular street displacement in the air-cooled world, and this Mahle forged 90.5mm × 69mm set (98-1990-B) is the forged upgrade — the slip-in big-bore that handles serious power without the failure risk of cast pistons.

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 × 69mm stroke = 1776cc 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: Runs the stock 69mm crank

Technical Specifications

• Bore: 90.5mm
• Stroke: 69mm
• Displacement: 1776cc
• 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: 98-1990-B
• UPC: 707924371482

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? No — it runs the stock 69mm 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? 98-1990-B (UPC 707924371482).

Installation

• Slip-in on a case already machined for 90.5/92mm. No 94mm head work required.
• 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.