HKS 21004-AN022 Capacity Upgrade Kit BCD STEP-2 for NISSAN Sklyline GT-R (R32/R33/R34) RB26 2.8L
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BCD Piston Kit + Connecting Rods + Crankshaft
Based on the 2.8L STEP2 kit and upgraded with lightweight, high-rigidity forged "BCD" pistons.
BCD = A bridge design is a truss structure that is employed at the back of the piston to enhance the rigidity of the piston.
Specifications
| HKS 2.8L KIT | Stock | |
|---|---|---|
| Bore | 87.0mm | 86.0mm |
| Stroke | 77.7mm | 73.7mm |
| Compression Ration (t=1.2) | 8.7 | - |
Max RPM |
9,000rpm | 7,600rpm |
| Displacement | 2,771cc | 2,568cc |
Piston Kit, Piston weight: 334g Piston Pin weight: 97g
- Lightweight A2618 aluminum alloy billet piston with high temperature strength
- Bridge design improves structural rigidity.
- Profile optimization has shortened the Piston skirt height and reduced weight.
- Short piston pit with lightweight boss part.
- 2 layers of molybdenum coating to eliminate friction and improve initial functionality of the whole system.
Crankshaft Stroke 77.7 mm
- Billet full counter crankshaft
- Counterweights are efficiently located to decrease overall weight and improve overall balance.
- Response is improved by reducing the weight of the pin journal and the center section by cutting the core of the pin journal to reduce the weight.
Connecting rods
- Nickel Chrome Steel Billet H-Beam Connecting rods.
- WPC treatment to improve strength
CAPACITY UPGRADE KIT RB26 2.8L LINEUP
| STEP ZERO | STEP 1 | STEP 2 | NEW STEP 3 | NEW HIGH RESPONSE | |
|---|---|---|---|---|---|
| Concept & Target | Capacity upgrade in engine O/H Mainly driving in street Improve response at an affordable price |
Improve torque & power by capacity and turbo upgrade Increase allowable RPM by high lift camshaft |
Increase more power by big turbo without losing response Increase allowable RPM by high lift camshaft Mainly for track race |
Next stage of STEP2 in high power and response Latest technology for ultimate performance |
Ultimate response with new designed ultra lightweight components Latest technology for ultimate performance |
| Recommend Turbo | Stock GTIII-SS | GTIII-SS GTIII-2530 | GTIII-RS GTIII-4R | GTIII-5R | GTIII-2530 |
| Allowable RPM | 8000rpm | 8500rpm | 9000rpm | 9000rpm | 9000rpm |
| Comp. ratio (t=1.2) | 8.7 | 8.7 | 8.7 | 8.7 | 8.7 |
| Max power (approx.) | 550PS | 600PS | 800PS | 900PS | 700PS |
| Piston | Forged φ86.5 or 87 - 21pin | Forged φ86.5 or 87 - 21pin | Forged φ87 - 21pin Nickel plating OBER coating |
A2618 alloy billet φ87 - 22pin Bridge Structure Double-layer MOLYBDEN coating |
A2618 alloy billet φ87 - 22pin Bridge Structure Double-layer MOLYBDEN coating |
| Piston Weight | 401g | 401g | 401g | 324g | 324g |
| Piston Pin | φ21 (105.2g) | φ21 (105.2g) | φ21 (105.2g) | φ22 (97g) | φ22 (97g) |
| Connecting Rod | HKS Forged billet H-beam φ2 (SCM) |
HKS Forged billet H-beam φ21 (SCM) |
HKS Forged billet H-beam φ21 (SNCM) |
HKS Forged billet H-beam φ22 (SNCM) |
HKS Forged billet H-beam φ22 (SNCM) |
| Crankshaft | Forged lightweight full counter (20.1kg) |
Forged full counter (24.4kg) |
Forged full counter (22.9kg) |
Billet full counter (20.6kg) |
Billet full counter (19.3kg) |
| Moment of inertia Ratio ?to STEP ZERO) |
100% | 132% | 119% | 113% | 102% |
| Allowable Torque | 55 kgf?m | 60 kgf?m | 80 kgf?m | 120 kgf?m | 70 kgf?m |