The HKS BCD Piston & Conrod Kit G16E HC-TT S3 (Part No. 21004-AT011) is a high-compression forged piston and connecting rod kit.
It was designed for the Toyota G16E-GTS 1.6L turbo 3-cylinder engine used in the Toyota GR Yaris and GR Corolla. It is part of HKS STEP3 engine internal upgrades aimed at higher power builds.
Key Specifications
- Engine: Toyota G16E-GTS
- Compatible cars: Toyota GR Yaris / GR Corolla
- Bore: 87.5 mm
- Stroke: 89.7 mm
- Displacement: 1,618 cc
- Piston weight: ~352 g
- Piston pin: 24 mm
- Compression ratio: ~10.6–10.7 (depending on gasket thickness)
Main Technologies & Engineering
1. BCD (Bridge Concept Design) Forged Pistons
- Made from A2618 forged aluminum, a material commonly used in high-temperature racing pistons.
- Bridge structure improves rigidity while keeping the piston lightweight.
- Two-layer anti-seizure coating reduces friction and improves durability.
2. HC-TT “Triple Tumble” Crown Design
- HKS developed a Triple Tumble piston crown.
- Creates an extra airflow tumble effect inside the cylinder during compression.
- Improves flame propagation and knock resistance.
This allows:
- Higher compression
- Better combustion efficiency
- Increased power potential.
3. Reinforced Billet Connecting Rods
- Nickel-chrome alloy steel I-beam rods.
- About 25% stronger than factory rods.
- WPC surface treatment improves fatigue strength and durability.
4. Advanced Cooling & Wear Protection
- Designed to work with three oil jets for piston cooling.
- Nickel plating above the top ring groove increases wear and knock resistance.
- Titanium coating on the top ring improves durability under high boost.
Performance Advantages
This kit is typically used for high-power GR Yaris / GR Corolla builds:
- Higher compression for improved response and power
- Much stronger bottom-end reliability
- Reduced piston weight for faster engine revving
- Improved detonation resistance under high boost
In many builds this type of bottom end is used for 450–600+ hp engine setups depending on turbo, fueling and tuning.
What Comes in the Kit
- Forged BCD pistons
- Billet I-beam connecting rods
- Piston pins
- Required hardware for assembly.
✅ Typical upgrade pairing
- HKS forged crankshaft or balanced stock crank
- ARP head studs
- Upgraded head gasket
- Larger turbo (G25-660 / T51R / EFR etc.)
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