HKS Forged Pistons for 2.1L Stroker kit - FA20 Toyota GT86 Subaru BRZ

Carefully selected specially forged raw materials used.
Replacing the gasket enables both NA and turbo-charged engine users to use this kit.
In order to cope with the demands of high outputs, strength analysis and tests have allowed optimisation of compression ratio for flexibility of setup and high boost use.
Piston crown had 3D design in consideration of stock direct injection system.
Stock pistons skirts overhang from the block during bottom of travel. Short height pistons have revised potential issues in this area.
Friction, weight and other design properties to suit the needs of short height pistons.

Stock

HKS 2.1L

Piston

Bore dia. mm

86

86

Displacement cc

1998.2

2091.2

Comp. Ratio (measured)

G/K 0.5 mm

12.1

12.4

G/K 0.6 mm

12

12.3

G/K 0.7 mm

11.9

12.1

G/K 1.0 mm

11.5

11.8

Boring/Horing

-

n/n

Remarks

Cast D. ignition

Forged D. ignition