HKS 2.2L Stroker Kit Step 1 SR20 – Silvia S13 S14 S15 180SX

Brand: HKS
Product: Capacity Upgrade Kit 2.2L Step 1 Full Kit – RPS13 PS13 S14 S15
Part Number: 21004-AN015

SPECIFICATIONS:
Piston Bore (mm): 86.5
Pin Bore (mm): 22.0
Displacement (cc): 2139
Stroke (mm): 91
Oil Ring: 2 pieces type
Compression Ratio (e):
– With 1.2mm Gasket: 8.7
– With 1.6mm Gasket: 8.4
– With 2.0mm Gasket: 8.2

Included:
– HKS Piston Kit
– HKS Fully Forged and Balanced Crankshaft
– HKS H-Cross Section Connecting Rods Kit

PRODUCT NOTES:
– Boring, Honing machining: Required
– Full flow modification: Not Required

COMPATIBILITY NOTES:
– Not Compatible with RNN14.

FEATURES:
– Displacement of SR20 is increased from stock 1, 998cc to 2, 139cc. The larger displacement will increase torque. It enables to be used with large flow capacity turbines.
– 86.5mm Piston is considered as STEP1 of 2.2L Kit. The surface treatment of STEP2 (f87.0) is not done for STEP1 to achieve the affordable price. This kit is also recommended for overhauling purpose. Feel the power of 2.2L. Although it is STEP1, it is forged piston. Forged connecting rod and forged crankshaft are the same items as STEP2 that means the maximum target horsepower is the same.
– MADE IN JAPAN (HKS in house production).

HKS RECOMMENDATIONS:
Using an used cylinder block:
Due to deformation, with 0.5mm diameter boring and honing may not be able to have accurate circle bore. (Same for other engine models.)
In case bore is not accurate circle, pistons cannot be installed accurately. Therefore, 87.0mm STEP2 with 1.0mm boring and honing is recommended.
87.0mm STEP2 has nickel plating, which is durable against knocking.

Using new or good condition cylinder block:
86.5mm is recommended so that 87.0mm can be used for the next overhauling.

For performance enhancement:
87.0mm in a new block is recommended. (Larger displacement will be better performance.)