The Ford EV 30 H – Petrol is a 3,995 cc, inline — six, overhead — valve (OHV) engine produced by Ford of Britain between 1961 and 1967. It was developed as a larger — displacement variant of the Ford Zephyr inline — six, featuring a single carburettor and pushrod valvetrain. This engine delivered 130 bhp at 4,400 rpm and 220 lb — ft of torque at 2,200 rpm, providing strong low — end pulling power ideal for full — size saloons and commercial applications.
Fitted to models such as the For…
Ford
Production years 1961–1967 predate mandatory European emissions standards; no Euro classification applies , Pre-1970 Series).
The Ford EV 30 H – Petrol is a 3,995 cc inline-six OHV engine engineered for full-size saloons and commercial vehicles (1961–1967). It combines a robust pushrod valvetrain with a single SU carburettor to deliver strong low-RPM torque and smooth cruising performance. Designed in a pre-emissions-regulation era, it prioritises mechanical reliability and serviceability over environmental compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 3,995 cc | |
Fuel type | Petrol (Unleaded RON 95 compatible with additives) | |
Configuration | Inline-6, OHV, 12-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 89.0 mm × 107.0 mm | |
Power output | 130 hp (97 kW) @ 4,400 rpm | |
Torque | 220 lb-ft (300 Nm) @ 2,200 rpm | |
Fuel system | Single SU HD6 carburettor | |
Emissions standard | Pre-regulatory (no Euro classification) | |
Compression ratio | 8.5:1 | |
Cooling system | Water-cooled, pressurised radiator | |
Turbocharger | Not applicable | |
Timing system | Chain-driven camshaft | |
Oil type | SAE 20W-50 mineral oil | |
Dry weight | 210 kg |
The Ford EV 30 H – Petrol was used across Ford's Mark IV platform with longitudinal mounting and applied to both passenger and commercial derivatives. This engine received platform-specific adaptations-fuel pump revisions in the Thames 400E and dual-exhaust options in performance-oriented Zodiac trims-and from 1965 minor carburettor and ignition tuning changes were introduced, creating interchange limits. All adaptations are documented in OEM technical bulletins.
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The EV 30 H's primary reliability risk is cylinder head warping, with elevated incidence in commercial or overheated applications. Ford's internal workshop reports from 1965 noted a significant number of head gasket failures in Thames 400E vans operating in urban conditions, while VCA historical records indicate cooling system neglect as a leading cause of premature engine wear. Sustained high load and improper coolant mix increase thermal stress, making regular cooling maintenance and correct oil usage critical.
Analysis derived from Ford technical bulletins (1961-1967) and VCA historical failure records (1965-1970). Repair procedures should follow manufacturer guidelines.
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Yes, when properly maintained. The EV 30 H features a simple, robust design with proven durability in both passenger and commercial roles. However, early models are prone to cylinder head warping if overheated or poorly serviced. Regular oil and coolant changes, valve adjustments, and use of lead-substitute additive with unleaded fuel significantly improve longevity. Well-cared-for examples regularly exceed 150,000 miles.
The most documented issues are cylinder head warping due to overheating, SU carburettor wear causing hesitation, timing chain slack leading to noise and misalignment, and cooling system failures from scale buildup. These are recorded in Ford service bulletins and workshop manuals, with specific repair procedures outlined for each.
The EV 30 H powered the Ford Zephyr Mark IV, Zodiac Mark IV, and Thames 400E forward-control van from 1961 to 1967. It was the top petrol engine option in the Zephyr/Zodiac range and used in heavier-duty commercial configurations of the Thames 400E. No other Ford models or brands used this specific engine variant.
Yes, within limits. Period-correct upgrades include fitting a second SU carburettor, performance camshaft, or extractors. Some owners retrofit electronic ignition for improved reliability. However, the engine's 8.5:1 compression and OHV design limit high-RPM potential. Tuning should preserve original clearances and avoid excessive boost or nitrous, which can damage the crank or head.
Approximately 20–24 mpg (UK) under mixed driving conditions. In the Zephyr Mark IV saloon, economy ranges from 18 mpg in city driving to 26 mpg on steady highway cruising. The Thames 400E van typically achieves 16–20 mpg depending on load. Fuel injection was not offered; economy is carburettor-dependent and influenced by driving style and maintenance.
No. The EV 30 H uses a non-interference OHV valvetrain design. If the timing chain fails or jumps, the pistons will not contact the valves, preventing catastrophic internal damage. However, the engine will stop running, and timing must be reset before restart. This design enhances serviceability and reduces risk during maintenance.
Ford specifies SAE 20W-50 mineral oil for the EV 30 H, as documented in Service Bulletin OIL/63/07. This viscosity ensures proper lubrication of the engine's larger bearing clearances and chain tensioner. Multi-grade synthetics are not recommended unless the engine has been modified with modern valve seats. Oil should be changed every 3,000–6,000 miles to maintain protection.
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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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