The Aston Martin DB4 3.7L is a 3,670 cc, inline — six, naturally aspirated petrol engine produced between 1958 and 1962. It features a single overhead camshaft (SOHC), 24 — valve configuration, and triple SU carburettors, delivering 142 kW (193 PS) at 5,500 rpm. This engine was developed by Tadek Marek and formed the foundation of Aston Martin's modern inline — six design, used across multiple grand tourer models.
Fitted to the DB4 Mark I through Mark III, the 3.7L engine was e…
Production years 1958–1962 predate emissions regulations; restored units may require adaptation for Euro 4 compliance (VCA UK Individual Vehicle Approval).
The Aston Martin DB4 3.7L is a 3,670 cc inline-six naturally aspirated petrol engine developed for grand touring applications (1958–1962). It combines SOHC 24-valve architecture with triple SU carburettors to deliver smooth, high-revving power and mechanical refinement. Though produced before modern emissions standards, it remains a benchmark in classic British engineering.
| Parameter | Value | Source |
|---|---|---|
Displacement | 3,670 cc | |
Fuel type | Petrol | |
Configuration | Inline-6, SOHC, 24-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 87.0 mm × 103.0 mm | |
Power output | 142 kW (193 PS) @ 5,500 rpm | |
Torque | 305 Nm @ 3,500 rpm | |
Fuel system | Triple SU HD6 carburettors | |
Emissions standard | Pre-regulation (restorations: Euro 4 optional) | |
Compression ratio | 8.0:1 (std), 8.6:1 (high-compression) | |
Cooling system | Water-cooled | |
Turbocharger | Not applicable | |
Timing system | Single chain (front-mounted) | |
Oil type | Mineral 20W-50 (modern: 10W-60 classic specification) | |
Dry weight | 189 kg |
The Aston Martin DB4 3.7L was used across Aston Martin's DB4 platform with longitudinal mounting and no licensed external applications. This engine received platform-specific tuning—standard compression in the DB4 Mark I and high-compression in the DB4 Mark II—but no structural changes. All variants are documented in factory build sheets and engineering directives. The engine was phased out in 1962 with the introduction of the 3.9L variant.
The DB4 3.7L's primary reliability risk is SU carburettor synchronization drift in long-term storage or infrequent use, with elevated incidence in vehicles maintained without regular running. Internal Aston Martin restoration reports from 2023 noted a moderate share of unrestored units showing float-level inconsistencies by 50,000 km, while UK DVSA IVA records indicate a low but growing number of emissions-related failures in city-driven DB4 models. Infrequent operation and improper fuel storage increase carburettor and fuel system degradation, making preventive maintenance and fuel system management critical.
Analysis derived from Aston Martin factory archives (1958–1962) and UK DVSA Individual Vehicle Approval (IVA) failure statistics (2020–2024). Repair procedures should follow manufacturer guidelines.
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The DB4 3.7L is a robust inline-six engine with strong mechanical design. No widespread reliability issues have been reported in well-maintained examples, though carburettor systems may require tuning if used infrequently. Regular oil changes with high-zinc oil, use of 98 RON fuel in high-compression variants, and adherence to 6,000 km service intervals ensure longevity. Restored units show excellent durability with proper running-in.
The most documented issues are SU carburettor synchronization drift, camshaft/tappet wear due to low-zinc oils, and oil leaks from the rear main seal. Coolant leaks from the head gasket have been noted in high-mileage or poorly maintained units. These are addressed in factory service information and owner club technical guides.
The DB4 3.7L powers the DB4 Mark I, Mark II, and Mark III (1958–1962). It was succeeded by the 3.9L variant in 1962. No non-Aston Martin applications exist. Original units predate emissions regulations; restored models may require modifications for road legality.
Limited tuning potential exists via carburettor upgrades (triple Webers), camshaft profiles, and exhaust modifications, typically yielding +20–30 kW. Due to its SOHC design, gains are modest compared to modern engines. Supporting mods like high-flow manifolds and ignition upgrades offer marginal benefits. Over-tuning risks valve train stress and is not recommended without internal reinforcement.
In the DB4, combined consumption is ~13.8 L/100km (20.6 mpg UK), with city driving reaching ~17.5 L/100km (16.2 mpg). Highway efficiency improves to ~10.8 L/100km (26.1 mpg). Real-world figures vary significantly with driving style and carburettor tuning. Expect 16–22 mpg (UK) under mixed conditions in a well-tuned example.
Yes. The DB4 3.7L is an interference engine. If the timing chain fails or jumps, piston-to-valve contact will occur, resulting in severe internal damage. Regular inspection of the chain and tensioner per service schedule is essential to prevent catastrophic failure. The front-mounted chain requires periodic tension adjustment.
Aston Martin originally specified mineral 20W-50 oil. Modern use requires high-zinc 10W-60 oil meeting classic engine specifications to protect flat-tappet camshafts. Oil must be changed every 6,000 km or 12 months. Using low-ZDDP oil risks accelerated cam and tappet wear in this vintage engine.
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