The Vauxhall 14 NV is a 1,398 cc, inline‑four naturally aspirated petrol engine produced between 1979 and 1984. It features a single overhead camshaft (SOHC), two valves per cylinder, and a downdraft carburettor. In standard form it delivered 46–51 kW (63–70 PS) and torque figures between 94–102 Nm, offering improved performance over the 12 N while retaining mechanical simplicity.
Fitted to models such as the Chevette, Astra Mk1 (T‑Car), and early Cavalier Mk2, the 14 NV…
Vauxhall
Production years 1979–1984 predate formal Euro emissions standards; compliance follows UK Construction & Use Regulations applicable at time of registration .
The Vauxhall 14 NV is a 1,398 cc inline‑four petrol engine engineered for compact and mid‑size models (1979–1984). It combines a single overhead camshaft with a downdraft carburettor to deliver modest power and fuel economy. Designed before formal Euro standards, it complies with contemporary UK emissions regulations for its era.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,398 cc | |
Fuel type | Petrol | |
Configuration | Inline‑4, SOHC, 8‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 79.4 mm × 70.6 mm | |
Power output | 46–51 kW (63–70 PS) @ 5,400–5,800 rpm | |
Torque | 94–102 Nm @ 3,200–3,600 rpm | |
Fuel system | Single-barrel downdraft carburettor (Zenith/Stromberg) | |
Emissions standard | Pre-Euro (UK C&U Regulations) | |
Compression ratio | 9.0:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain-driven SOHC | |
Oil type | SAE 20W‑50 mineral oil (API SF/CC) | |
Dry weight | 115 kg |
The Vauxhall 14 NV was used across Vauxhall's T‑Car and J‑Car platforms with longitudinal mounting and no external licensing. This engine received platform-specific adaptations—reinforced mounts in the Chevette and revised cooling ducts in the Astra Mk1—and from 1981 the facelifted Cavalier Mk2 adopted updated carburettor jets and cam profiles, creating minor interchange limits. All adaptations 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 Vauxhall technical bulletins (1979–1984) and UK DVSA historical failure statistics (1980–1990). 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
The 14 NV is mechanically simple and robust if maintained properly. Early models (1979–1981) are prone to cam wear without regular oil changes. Later revisions improved durability. Using correct SAE 20W‑50 oil and checking valve clearances every 10,000 km greatly extends engine life.
Top issues include camshaft/tappet wear, carburettor flooding or lean running, rocker cover oil leaks, and timing chain stretch. These are well-documented in Vauxhall service bulletins M‑14‑81 and workshop manuals from the 1980s.
The 14 NV powered the Chevette (1979–1984), Astra Mk1 (1979–1984), and Cavalier Mk2 (1981–1984) in 1.4 L trim. It was never licensed to other manufacturers and is exclusive to Vauxhall’s T‑Car and J‑Car platform derivatives.
Modest gains are possible. Upgrading to a twin-choke carburettor, performance camshaft, and free-flow exhaust can yield +5–8 kW. However, the bottom end is not designed for high stress—aggressive tuning risks bearing wear. Most owners retain stock tune for reliability.
Typical consumption is ~9.0 L/100km (city) and ~6.5 L/100km (highway), or about 31–36 mpg UK combined. Real-world figures vary with carburettor condition and driving style, but expect 29–38 mpg (UK) on mixed roads for a well-maintained engine.
No. The 14 NV is a non-interference engine. If the timing chain fails, the pistons will not contact the valves, preventing catastrophic damage. However, chain replacement is still advised to avoid ignition timing issues.
Vauxhall specifies SAE 20W‑50 mineral oil meeting API SF/CC. Modern synthetic oils may reduce oil pressure due to tighter tolerances in older pumps. Change oil every 5,000–7,500 km to protect the cam and tappets.
Comprehensive technical documentation and regulatory references
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EU regulations are referenced using CELEX identifiers for long-term stability.
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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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