Piston Ring Set, 92mm, 1.5 X 2 x 4, for Aircooled VW

OVERVIEW

When you''re pushing the limits of your air-cooled powerplant with a 92mm big-bore kit, the seal between your combustion chamber and the crankcase is the single most important factor in maintaining horsepower and engine longevity. This Grant Piston Ring Set is engineered specifically for the 1835cc engine configuration, providing the precision fitment required for high-performance Type 1, 2, and 3 engines. Grant has been a cornerstone in the piston ring industry for decades, and these rings are manufactured to provide a rapid seat-in period while offering exceptional durability against the high cylinder head temperatures common in air-cooled Volkswagens. Whether you are rebuilding a weekend cruiser or a dedicated dirt-slinging dune buggy, these rings ensure that your compression stays where it belongsabove the piston.

This comprehensive set features a 1.5mm top ring, a 2mm second compression ring, and a 4mm oil control ring, a combination designed to balance friction reduction with maximum oil scraping efficiency. The materials used in these Grant rings are chosen for their thermal stability, ensuring they don''t lose their tension even when your engine is working hard on a hot summer afternoon. By utilizing a high-grade cast iron and steel construction, these rings provide the flexibility needed to conform to cylinder walls that may experience slight thermal expansion, which is a hallmark of the VW flat-four design. Investing in a quality set of rings like the G1996 series is the best insurance policy you can buy for your 92mm pistons, preventing the dreaded blow-by and oil consumption that can plague lesser-quality builds.

FITMENT

These piston rings are designed for 92mm bore cylinders, typically found in 1835cc performance upgrades. They are compatible with the following air-cooled Volkswagen models equipped with 92mm piston and cylinder kits:

• Volkswagen Type 1: Beetle, Bug, and Super Beetle (All years utilizing 92mm big-bore kits).
• Volkswagen Type 2: Bus, Transporter, Kombi, and Microbus (1950-1971 with 1600cc based upright engines).
• Volkswagen Type 3: Fastback, Squareback, and Notchback (All years utilizing 92mm performance cylinders).
• Volkswagen Karmann Ghia: All years (equipped with 1600cc-style cases bored for 92mm).
• Volkswagen Thing: Type 181 (1973-1974 models with upgraded engine displacement).
• Custom Applications: Dune Buggies, Sand Rails, and Trikes utilizing the VW Type 1 air-cooled engine platform.

SPECS

• Brand: Grant Piston Rings
• Part Number: G1996
• OEM Reference Number: 311-198-16992
• Bore Diameter: 92mm
• Top Compression Ring Thickness: 1.5mm
• Second Compression Ring Thickness: 2.0mm
• Oil Scraper Ring Thickness: 4.0mm
• Material: High-tensile cast iron and premium steel alloys
• Set Quantity: Complete set for 4 pistons (full engine set)
• Compatibility: Designed for standard 92mm "thick wall" or "thin wall" piston sets with matching groove depths

PRO TIPS

1. Always Verify Your Ring End Gap

Never assume that rings are "drop-in" ready straight out of the box. Even with a high-quality set like Grant, you must check the ring end gap by placing each ring individually into the cylinder it will be running in. Use a piston to square the ring about an inch down into the bore, then use a feeler gauge to measure the gap. For a 92mm air-cooled street engine, a general rule of thumb is .004 inches of gap per inch of bore diameter. If the gap is too tight, the ring ends can touch as they expand from heat, leading to catastrophic cylinder wall damage or broken ring lands. If you need to file the rings, always file from the outside toward the inside to avoid chipping the coating.

2. Master the Art of Ring Clocking

The orientation of your ring gaps is critical to preventing oil consumption and compression loss. When installing these on your 92mm pistons, ensure that the gaps are staggered. A common and effective method is the 120-degree rule: position the top ring gap at the 12 o''clock position, the second ring gap at 4 o''clock, and the oil ring expander gap at 8 o''clock. Furthermore, ensure the gaps for the oil ring rails are offset from the expander gap. Never align a gap with the piston pin bore or the thrust side of the piston, as this creates a direct path for combustion gases to bypass the piston and enter the crankcase.

3. Proper Cylinder Preparation is Key

To ensure these Grant rings seat properly and provide a lifetime of service, your 92mm cylinders must have a fresh cross-hatch pattern. If you are reusing cylinders, they should be lightly honed with a 220 to 280 grit flex-hone (dingleberry hone) to break the glaze. Once honed, clean the cylinders meticulously with hot soapy water until a white paper towel wiped inside comes out completely clean. Any leftover honing grit will act as an abrasive and prematurely wear your new rings. During assembly, use a light coat of high-quality assembly oil or standard 30-weight motor oil on the rings and cylinder walls to provide initial lubrication without preventing the rings from "taking" to the cylinder wall during the first few minutes of operation.