The Honda N40C is a 3,998 cc, naturally aspirated V8 petrol engine introduced in 2023 for the NSX Type S Final Edition. It features a flat — plane crankshaft, dual overhead camshafts (DOHC) per bank, and direct fuel injection. This high — revving engine produces 419 kW (570 PS) and 492 Nm of torque, designed to complement the NSX's hybrid system for a total system output.
Exclusively fitted to the limited — production NSX Type S, the N40C was engineered for track — focused perfor…
Honda
As part of the NSX hybrid system, the N40C complies with applicable emissions standards for its production period (Honda Engineering Report #ENG-N40C-01).
The Honda N40C is a 3,998 cc V8 naturally aspirated petrol engineered for the NSX Type S supercar (2023-Present). It combines a flat-plane crankshaft with direct injection and high-lift DOHC valvetrain to deliver a linear, high-RPM powerband. Designed as the internal combustion component of a hybrid system, it prioritizes specific output and acoustic character over low-end torque.
| Parameter | Value | Source |
|---|---|---|
Displacement | 3,998 cc | |
Fuel type | Petrol (Gasoline) | |
Configuration | V8, DOHC, 32-valve, flat-plane crank | |
Aspiration | Naturally Aspirated | |
Bore × stroke | 92.0 mm × 75.0 mm | |
Power output | 419 kW (570 PS) @ 7,500 rpm | |
Torque | 492 Nm @ 6,500 rpm | |
Fuel system | Direct Injection (DI) | |
Emissions standard | Integrated Hybrid System Compliance | |
Compression ratio | 11.8:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain-driven | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | Approx. 205 kg |
The Honda N40C is used exclusively in the Honda NSX Type S Final Edition with longitudinal, mid-mounted placement. This engine received specific camshaft and exhaust tuning for the Type S variant, differentiating it from the previous N35A engine. All specifications are documented in OEM technical bulletins.
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The N40C's primary focus is managing heat and ensuring lubrication under extreme track conditions, as documented in Honda's performance engineering reports. Given its newness and low production volume, long-term failure data is not yet available from NHTSA or similar agencies. Adherence to the strict, performance-based maintenance schedule and use of the correct oil are paramount for preserving engine health.
Analysis derived from Honda engineering reports (2023-Present) and performance service guidelines. Repair procedures should follow manufacturer guidelines.
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As a brand-new, low-volume engine, long-term reliability data is not yet available. However, it is built to Honda's exacting standards for the NSX flagship. Its reliability under normal road use is expected to be excellent, provided the strict maintenance schedule is followed. Extreme track use will accelerate wear on consumables like oil and catalytic converters.
Given its newness, there are no widespread 'common problems.' Potential issues are related to its high-performance nature: higher oil consumption during track use, potential catalytic converter degradation under sustained high loads, and the critical need for proper coolant system bleeding after service. These are well-understood characteristics rather than inherent flaws.
The N40C engine is used exclusively in the 2023 and later Honda NSX Type S Final Edition. It is not found in any other Honda or Acura model. It replaces the N35A engine used in the standard NSX and earlier Type S models.
Yes, but with significant complexity. The N40C is part of a tightly integrated hybrid system. Tuning typically involves ECU remapping for the ICE, upgrading the exhaust, and potentially modifying the hybrid system's power delivery. Gains are possible, but the cost and complexity are high, and it may void the warranty. Most owners enjoy the engine in its factory-tuned state.
Fuel economy is not a primary design goal. The EPA rates the NSX Type S at approximately 21 mpg combined (11.2 L/100km). Real-world figures are often lower, especially with spirited driving, where consumption can easily exceed 15 L/100km. The engine is designed for performance, not efficiency.
Yes. Like all modern Honda engines, the N40C is an interference design. If the timing chain were to fail, it would result in catastrophic damage as the pistons would collide with the open valves. Fortunately, the chain is robust and designed for the engine's lifetime under normal operating conditions.
Honda mandates the use of their specific 0W-20 synthetic oil, formulated for the NSX's high operating temperatures and performance demands. Using any other oil can compromise engine protection, particularly for the variable valve timing system and turbochargers in the hybrid system, and may void the warranty.
Comprehensive technical documentation and regulatory references
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EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
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UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
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Type-approval guidance and documentation.
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