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 performance and an exhilarating, high-RPM soundtrack. The engine's character prioritizes responsiveness and driver engagement over low-end torque, with peak power arriving at 7,500 rpm. Emissions compliance is integrated within the NSX's overall hybrid system certification.
One documented engineering focus was optimizing the engine's acoustic profile and high-RPM stability for the Type S variant. This involved revised cam profiles and exhaust tuning, detailed in Honda's internal engineering report #ENG-N40C-01, to enhance the flat-plane crank's signature sound while maintaining structural integrity at redline.
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 | Honda 0W-20 (NSX Specific) | |
| Dry weight | Approx. 205 kg |
The flat-plane crank V8 delivers a thrilling, high-RPM powerband but requires premium 98 RON fuel for optimal performance and to prevent detonation. The specified 0W-20 oil is critical for maintaining variable valve timing and chain lubrication under extreme conditions. As a low-volume, high-performance engine, servicing should be performed by Honda NSX specialists using genuine parts. The engine's design prioritizes peak power over low-end torque, making its character best experienced at higher revs.
Oil Specs: Requires Honda 0W-20 specification formulated for the NSX's high operating temperatures (Honda Owner's Manual NSX Type S).
Emissions: Compliance is achieved as part of the NSX's certified hybrid powertrain system (Honda Engineering Report #ENG-N40C-01).
Power Ratings: Measured under SAE J1349 standards. Peak figures require 98 RON fuel (Honda TIS Doc. N40C-PERF-01).
Honda Technical Information System (TIS): Docs N40C-ENG-01, N40C-PERF-01
Honda Engineering Report: #ENG-N40C-01
Honda Owner's Manual: NSX Type S (2023)
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.
The N40C is only found in the 2023+ NSX Type S. The engine code is stamped on the block near the rear bank (Honda TIS N40C-ID-01). Visually, it can be identified by its red intake plenum and "Type S" badging on the engine cover. It is critically differentiated from the N35A by its larger displacement, flat-plane crank (audible by its distinct exhaust note), and specific cam profiles. All parts are unique to the NSX Type S application.
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.
Find answers to most commonly asked questions about HONDA N40C.
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