Mahle Forged Piston & Cylinder Set | VW Type 1 Air-Cooled | 87mm × 69mm 1641cc (98-1987-B)

Mahle Forged Piston & Cylinder Set — 87mm × 69mm Stroke, 1641cc | VW Type 1 Air-Cooled (98-1987-B)

The 1641cc big-bore is a favorite budget power-adder for the Type 1, and this Mahle forged 87mm × 69mm set (98-1987-B) is the forged-piston version — the upgrade for any 1641 build where heat or detonation would crack a cast slug.

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: 87mm bore × 69mm stroke = 1641cc displacement
• Forged pistons: Mahle forged pistons — forged, not cast, for strength under heat, boost, and nitrous
• Complete set of 4: cylinders, forged pistons, rings, wrist pins, and clips
• Crank: Runs the stock 69mm crank

Technical Specifications

• Bore: 87mm
• Stroke: 69mm
• Displacement: 1641cc
• Piston: Mahle forged aluminum alloy
• Cylinder: Cast iron
• Sold as: Complete set of 4 (includes rings, pins, clips)
• Brand: Mahle
• Part Number: 98-1987-B
• UPC: 707924433876

Frequently Asked Questions

• Does this fit my air-cooled VW Type 1? Yes — Beetle, Super Beetle, Karmann Ghia, Bus (Type 2), and Type 3, with the case machined for this bore where required.
• Are these forged or cast pistons? Forged — Mahle forged pistons, 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? Mahle 98-1987-B (UPC 707924433876).

Installation

• Slip-in on a standard case machined for this bore — no special case work required.

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.