Type 4 Piston Ring Set - 1.8L Bus, 412 & Porsche 914 2x2x4 93mm 021-198-175A VW

Piston Ring Set (1.8L Type 4) – 021-198-175A

The 021-198-175A is a complete, engine-specific Piston Ring Set engineered for the Volkswagen and Porsche 1.8L Type 4 engine. This set includes all the necessary compression and oil control rings required to refresh all four cylinders during an engine rebuild. In the air-cooled Type 4 platform, worn piston rings are the primary cause of increased oil consumption, reduced cylinder compression, and excessive crankcase "blow-by" which can lead to overheating.

Replacing your old rings with the 021-198-175A set restores the tight seal between the piston and the cylinder wall, which is essential for maximizing torque and improving fuel efficiency. These rings are manufactured to handle the high thermal loads of the air-cooled 1800cc engine, providing long-lasting durability for both long-distance cruising in a Transporter or spirited driving in a 914.

Detailed Vehicle Compatibility

Fits 1.8L H4 Type 4 engines.

VW 412: 1974

VW Transporter: 1974, 1975

Porsche 914: 1974, 1975

Product Highlights & Features

• Complete 4-Cylinder Kit: Contains a full set of top compression rings, second compression rings, and oil scraper rings for all four pistons.

• Precision Sealing: Engineered to OEM tolerances to ensure immediate ring seating and optimal compression from the first startup.

• High-Strength Materials: Built from specialized steel and cast iron alloys designed to resist heat-related tension loss and minimize cylinder wall wear.

• Restores Performance: Corrects power loss and blue exhaust smoke caused by oil bypass, helping your Type 4 engine meet original factory performance specs.

Technical Specifications

• Part Number: 021-198-175A

• Engine Type: 1.8L Type 4 (Air-Cooled)

• Standard Bore: 93.00mm

• Ring Height: 2mm x 2mm x 4mm 

• Kit Includes: Rings for 4 Pistons

Installation & Maintenance Tips

• Check Your Bore Size: This set is for standard 93mm bores. If your cylinders have been bored over or if you are running a larger displacement kit, you will need the corresponding oversized ring set.

• Clock Your Rings: When installing rings on the piston, ensure the gaps are "clocked" or staggered according to the factory manual (usually 120 degrees apart). Never align the gaps, as this will cause immediate oil consumption and compression loss.

• Hone the Cylinders: For the best results, the cylinder walls should be lightly honed to create a "cross-hatch" pattern. This allows the new rings to "bite" into the wall and seat properly during the break-in period.

• Ring End Gap: Always measure the ring end gap by placing each ring manually into its respective cylinder bore before mounting it on the piston. This ensures that the thermal expansion won't cause the ring ends to touch and damage the engine.