Reviewing the material and design has allowed for a stronger and lighter unit.
NISSAN
SR20DE (T) AL Slide Sprocket 2203-RN009 Transverse-mounted engine: For IN & EX.Vertical mounted engine: For IN (Not compatible with NVCS)
SR20DE (T) AL Slide Sprocket 2203-RN010 Vertical mounted engine: For EX.
Highly durable and lightweight pulley
Using a super light duralumin (A2014) as its main material that the strength has increased by 50% and hardness by 30% (over previous version). This change in material has allowed the design change that has also allowed the unit to be substantially lighter (10% less load on RB engines) and increasing the engine reliability and power.
Nickel plating increases anti-frictional properties
Gear section is nickel plated for surface hardness increase (Hv: 350 → 500 (compared to older version)) to withstand strengthened timing belts and any foreign objects that may get caught between the gear and belt.
HKS: Cam Pulley EX SR20DET w/Gear
Brand: HKS
Part Number: 2203-RN010
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