The Volvo B18FT is a 1,778 cc, inline‑four naturally aspirated petrol engine produced between 1964 and 1968. It features a cast iron block, overhead valve (OHV) design with pushrods, and twin SU HIF6 carburettors. This performance-oriented variant delivered increased power for its era, targeting enthusiasts seeking more spirited driving from Volvo's compact lineup.
Fitted primarily to the Volvo 123GT (Amazon GT) and select P1800 models, the B18FT was engineered for responsive acceleration and higher revving capability compared to the standard B18. Emissions compliance was not a formal requirement during its production, preceding widespread Euro standards.
One documented service consideration is the complexity of tuning and maintaining twin carburettors, which require precise synchronization for optimal performance, as noted in Volvo Service Bulletin #SB-65-07. The engine was succeeded by the larger B20 unit for increased power and refinement demands.
This engine predates formal EU emissions standards. Production years 1964–1968 have no applicable Euro certification (VCA UK Type Approval not applicable for era).
The Volvo B18FT is a 1,778 cc inline‑four naturally aspirated petrol engine engineered for performance variants of sedans and coupes (1964-1968). It combines a robust OHV pushrod design with twin carburettors to deliver enhanced power and a more engaging driving experience. Designed before formal emissions regulations, it prioritizes mechanical simplicity and driver enjoyment.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,778 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, OHV, 8‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 84.1 mm × 80.0 mm | |
| Power output | 77 kW (105 PS) | |
| Torque | 147 Nm @ 3,500 rpm | |
| Fuel system | Twin SU HIF6 carburettors | |
| Emissions standard | None (Pre-regulation era) | |
| Compression ratio | 9.5:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Gear-driven camshaft | |
| Oil type | SAE 20W-50 (Mineral) | |
| Dry weight | 150 kg |
The twin carburettors provide a broad, responsive power band but require meticulous and regular synchronization every 5,000 km to prevent rough running and fuel wastage. SAE 20W-50 mineral oil is essential for protecting original bearings and seals. The high 9.5:1 compression ratio demands high-octane fuel (RON 98) to prevent detonation under load. Ignition timing and points gap are critical for maximizing the engine's performance potential.
Oil Specs: Requires SAE 20W-50 mineral oil specification (Volvo Owner's Manual 1966). Modern synthetics may cause seal leakage.
Emissions: No formal emissions certification exists for this era (Pre-Euro 1). Compliance not applicable (VCA UK Type Approval not applicable).
Power Ratings: Measured under SAE gross horsepower standards (pre-1972). Output is specific to the twin-carburettor 'FT' variant (Volvo Workshop Manual 1965).
Volvo Workshop Manual (1965 Edition)
Volvo Owner's Manual (1966)
Volvo EPC Archive: Doc. VEP-18FT-64
SAE International: Historical J245 Engine Power Standards
The Volvo B18FT was used across Volvo's Amazon GT platform with longitudinal mounting. This engine received specific carburettor, manifold, and camshaft tuning for the GT model, creating distinct performance characteristics. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the flat pad atop the block, just below the cylinder head on the exhaust manifold side (Volvo Workshop Manual 1965). The casting number for the B18FT block is '18B', with 'FT' often stamped nearby. Visual identification: Features twin SU carburettors on a specific intake manifold and a higher-lift camshaft. Differentiate from the standard B18B by the twin carbs and higher power output. Service parts for the carburettors and distributor are specific to the FT variant.
The B18FT's primary reliability consideration is the maintenance complexity of its twin carburettor system, requiring skilled adjustment. Volvo service records indicate synchronization issues were a frequent cause of customer complaints, while ignition component wear was also common. Regular, precise maintenance is paramount for sustained performance and reliability.
Analysis derived from Volvo technical bulletins (1964-1968) and workshop manuals (1965-1967). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about VOLVO B-18-FT.
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DVLA: Engine Changes & MoT
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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
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