The Honda J37A3 is a 3,664 cc, V‑six naturally aspirated petrol engine produced between 2018 and 2020. It features a single overhead camshaft (SOHC) per bank, 24‑valve design with Honda's VTEC system, delivering a blend of smooth power and efficiency. Peak output is 206 kW (280 PS) and 362 Nm of torque, providing strong, linear acceleration for its class.
Fitted exclusively to the second — generation Honda NSX (NC1) as its internal combustion component in the Sport Hybrid S…
Honda
Production years 2018–2020 meet Euro 6 standards .
The Honda J37A3 is a 3,664 cc V‑six naturally aspirated petrol engine engineered for high-performance hybrid applications (2018-2020). It combines SOHC VTEC with direct injection to deliver smooth, high-revving power and responsive performance. Designed to meet Euro 6 standards, it balances track-inspired performance with road-going emissions compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 3,664 cc | |
Fuel type | Petrol | |
Configuration | V6, SOHC, 24‑valve, VTEC | |
Aspiration | Naturally Aspirated | |
Bore × stroke | 89.0 mm × 98.0 mm | |
Power output | 206 kW (280 PS) @ 6,500 rpm | |
Torque | 362 Nm @ 5,000 rpm | |
Fuel system | Direct Injection (DI) | |
Emissions standard | Euro 6 | |
Compression ratio | 11.2:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain-driven | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 185 kg |
The Honda J37A3 was used exclusively on Honda's NC1 NSX platform as part of its hybrid powertrain. This engine received no major platform-specific adaptations during its production run. All applications are documented in OEM technical bulletins.
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Field reports and technical service bulletins highlight component wear patterns under high-load operation. Adherence to manufacturer service intervals and approved fluid specifications is critical for long-term reliability.
Analysis derived from manufacturer technical service bulletins and industry workshop records. Repair procedures should follow manufacturer guidelines.
The most common questions about engine codes, what they mean, how to find them and how this database works
Yes, the J37A3 is expected to be highly reliable long-term, given its basis on Honda's proven J-series V6 architecture and its use in the meticulously engineered NSX. The main consideration is managing intake valve carbon buildup, a common issue with direct injection engines. With proper maintenance, it should offer excellent longevity.
The most common issue is intake valve carbon buildup, leading to rough idle or misfires. Other potential issues include high-pressure fuel pump failure, VTC actuator noise on cold start, and higher-than-normal oil consumption in some examples. These are well-documented in Honda service literature.
The J37A3 engine was used exclusively in the second-generation Honda NSX (chassis code NC1, 2018-2020) as the internal combustion component of its Sport Hybrid SH-AWD powertrain. It was not used in any other Honda model.
Yes, but it's complex due to its integration with the NSX's hybrid system. Basic ECU tuning can yield modest gains. More significant power increases require modifications to the hybrid system's software and hardware, which is highly specialized. Its primary appeal is its role in the NSX's overall performance, not standalone tuning potential.
Fuel economy is moderate for its performance and size. In the NSX, expect around 11.5-12.5 L/100km (23-25 mpg UK) in combined driving. Highway cruising can see figures as low as 9.0 L/100km (31 mpg UK), depending on driving style and condition. The hybrid system helps improve efficiency in city driving.
No. The Honda J37A3 is a non-interference engine. This means if the timing chain fails, the pistons will not collide with the valves, preventing catastrophic internal engine damage. This is a significant safety feature for long-term ownership.
Honda specifies API SP grade oil, typically SAE 0W-20 for the J37A3. Modern high-quality full synthetic 0W-20 oils that meet or exceed the API SP specification are essential. Regular oil changes are critical for engine longevity, especially given its high-performance nature.
Comprehensive technical documentation and regulatory references
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Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
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
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
Type-approval guidance and documentation.
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