Description
For VW/AUDI 1.8 20V enginesNominal bore diameter: 83.5mm (increase engine displacement to 1893cc)Recommended bore to piston to bore clearance: 0.08mm (For nitrous or extreme applications, consult your builder)Piston ring grooves: 1.5 mm / 1.5 mm / 2.0mmCompression height: 32.40mm.Dish volume: 7ccCompression ratio: 8.5:1Pin offset: 1.10mm.Material: Forged aluminum 4032 T6.Average piston weight (unit, without pin): 347.74g (12.2 oz).Rated for 1000hp.Innovative high performance piston skirt design that provides: 1. Smaller piston to bore clearance 2. Less noise 3. Better ring seal 4. Higher power 5. Durability Features:Anti detonation grooves: protect the top ring by disrupting detonation waves and reduce piston-cylinder contact in high temperatures and engine RPM conditions.Accumulator groove: accumulates residual combustion gasses reducing top ring flutter and improving seal.Pin oil lubrication by broaches and oiler to reduce friction and increase durability. Super A Piston Pin (63.45mm) – 4pcs setFor VW 827 engines (Super A pistons)Dimensions: 63.45mm x 20mm (length x O.D.)Average unit weight: 116g (4.09 oz)Rated for 1.000hpMade from special steel alloys that combines optimal mass with high resistance.PistonRings 83.5mm SPA DLC seriesSpecifications:1º ring 1.5mm – Made from carbon steel, which is 35% stronger than cast iron and about 30% lighter. DLC treated, which is the application of carbon particles, that provides higher resistance and lower friction.2° ring 1.5mm – Made from cast iron.3º ring 2.0mm – Made by 3 parts, providing easy handling, better oil film stability and improvement in oil removal by the lubrication holes due to its optimized design.